Teacher and researcher in environmental sciences, specialist in the field of integrated coastal zone management, marine ecology, biodiversity and wetland conservation, and eager for knowledge for the protection of aquatic living resources, and the conservation of nature.
Journal of Survey in Fisheries Sciences, 11(2) 30-36, 2024
A biometric study was conducted on a benthic fish of the family Congridae, the European conger ee... more A biometric study was conducted on a benthic fish of the family Congridae, the European conger eel (Conger conger Linnaeus, 1758), from the western coasts of Algeria, from Béni-Saf. This study was carried out due to the total absence of reliable and exploitable information concerning the morphometric characteristics of this fish along the Algerian coast. It was based on statistical processing of 18 morphometric variables measured on each sampled fish. the comparison between months using univariate ANOVA and multivariate MANOVA statistical tests showed significant differences in morphometric variables measured on the European conger eel (Conger conger). However, regarding the sex factor, no significant differences were observed between males and females.
This present paper presents an inventory of benthic Malacostraca in the Gulf of Oran. The softbot... more This present paper presents an inventory of benthic Malacostraca in the Gulf of Oran. The softbottom crustacean fauna was studied between February 2021 and September 2021. Samples were collected from 8 coastal stations. The class Malacostraca was represented with 2 subclasses, Eumalacostraca and Phyllocarida. Sixty-one species and 290 individuals belonging to seven crustacean orders (Amphipoda, Decapoda, Isopoda, Tanaidacea, Mysida, Lophogastrida and Leptostraca) were identified. Amphipoda were represented with the highest number of species (36) followed by Decapoda (11) and Isopoda (6). Tanaidacea and Mysida were poorly represented, with 3 and 2 species, respectively. Lophogastrida and Leptostraca were both represented by only one species. Among the crustaceans encountered, Ampelisca was the most dominant genus. The present inventory indicates that the carcinological fauna in the Gulf of Oran is less diversified than it is in other zones that have been studied on the Algerian coast (Gulf of Arzew, Bay of Bou-Ismail, and Bay of Algiers).
The pink spiny lobster, Palinurus mauritanicus Gruvel, 1911 is a target species of commercial fis... more The pink spiny lobster, Palinurus mauritanicus Gruvel, 1911 is a target species of commercial fisheries along the Algerian west coast. To better understand the natural diet of a population of P. mauritanicus, a study was conducted between June 2021 and May 2022, which aimed to compare the consumed food items based on sex, seasonality, and body size. This approach involved analysing stomach contents and determining ingested prey, with seasonal sampling conducted at three main fishing ports (Béni Saf, Bouzedjar and Oran). The results showed that fish (in general "Pisces", but only Osteichthyes retrieved) (46.42%), Crustacea (34.28%), Annelida Polychaeta (23.33%), and Mollusca (18.57%) were the major components of the lobster's diet. Echinodermata (8.57%), Porifera (2.38%) and Bryozoa (0.95%) were classified as minor groups. We also showed that sex and season affected the prey items consumed by the lobster. Based on the vacuity index, the pink spiny lobster was found to be feeding intensively in spring and decreasingly so in summer, autumn and winter. These results indicate that the pink spiny lobster is to be characterized as an omnivorous generalist and opportunist.
Journal of Survey in Fisheries Sciences: 10(1) 1-11, 2023
The sardine (Sardina pilchardus) is the most popular species for fishing of the Algerian coast. F... more The sardine (Sardina pilchardus) is the most popular species for fishing of the Algerian coast. Five toxic metals zinc (Zn), cadmium (Cd), copper (Cu), lead (Pb), and iron (Fe) that can affect human health are studied in this fish. Samples are collected monthly between January and December 2019 in the Ghazaouet bay. The collected samples were analyzed by atomic absorption spectrophotometry by sex and for two organs (gonads and gills). For all the male and female samples, Zn and Fe showed the highest values, respectively (1.00±0.406 mg/kg.FW and 0.770±0.28 mg/kg.FW), however the low values concern Cu (0.017 mg/kg.FW). Zn and Cd contents are higher in the gonads, and those of Fe and Pb are higher in the gills. However, Cu concentrations are similar in both organs (gonads and gills). Statistical analysis recorded a significant difference (p<0.05) for all metals (Zn, Pb, Fe and Cd) except for Cu (p> 0.05) between the two organs. S. pilchardus may represent a hazard for consumers. S. pilchardus may represent a hazard for consumers, but a continuous monitoring of heavy metals is necessary to insure the prescribed worldwide limit.
Background and Objective: The characterization of sediment grain sizes and their spatial distribu... more Background and Objective: The characterization of sediment grain sizes and their spatial distributions are key input parameters to study the nature and texture of the seabed substrate. The aim for analysis of these parameters makes it possible to identify the distribution of sediments and a better understanding of the spatial distribution of benthic communities in the soft bottoms of the Gulf of Oran. Materials and Methods: Sediment samples were collected and studied from the sampling of 36 stations, ranging in depth from-30 to-106 m. All samples were analysed for their grain size distribution and statistical relationships. Results: The study area is mainly composed of sand and gravel. The sand content of the stations studied is between 19.14 and 89.71% and that of the gravel is between 80.0 and 2.14%. Most stations in the Gulf of Oran contain less than 5% muddy sediment. Five important sedimentary facies and a small zone of reduced mud are identified. Conclusion: Sand is found often mixed with gravel. The sediments of the stations near the coasts are very affected by urban and industrial pollution. The sediments at all stations are generally varied and influenced by hydrodynamics, turbidity and wave dynamics.
The deep-water rose shrimp, Parapenaeus longirostris (H. Lucas, 1846), is the most dominant shrim... more The deep-water rose shrimp, Parapenaeus longirostris (H. Lucas, 1846), is the most dominant shrimp species on the Algerian west coast. In that area, the diet of P. longirostris was studied between July 2020 and June 2021. This approach to the diet of the rose shrimp was based on analysis of the stomach contents and determination of the ingested prey. A seasonal sampling was carried out in the main fishing ports (Béni Saf, Bouzedjar, Oran and Mostaganem). The results obtained showed that the shrimp feed intensively in spring and increasingly less in winter and summer. Crustaceans, foraminiferans, polychaetes, and molluscs constituted the most frequent preys in the diet, with respective frequencies of 58.85, 55.95, 36.63 and 32.04%. Small microplancton and mesoplancton prey (radiolarians, copepods, and various larvae) were less important in the diet of P. longirostris. Fish and echinoderms constitute accidental prey, of which the frequency is less than 10%.
The characterization of Patella caerulea Linnaeus, 1758, P. rustica Linnaeus, 1758 and P. ferrugi... more The characterization of Patella caerulea Linnaeus, 1758, P. rustica Linnaeus, 1758 and P. ferruginea Gmelin, 1791 (Gastropoda Patellidae) has been a source of debate and controversy since they were proposed as species. This was due to the high shell variability, and some of them display intermediate characteristics. In the present work, samples of three species of Patella were examined and compared using several morphometric characters describing the shell and soft parts. 575 individuals of P. caerulea, 132 individuals of P. rustica, and 45 of P. ferruginea were sampled from Algerian West Coast. The biometry of the three species has been studied: length (L), width (Wi), height (H) of the shell and the weight (W) of every individual. A strong positive correlation was noted between these parameters for all three species. These parameters were used also for the Principal Component Analysis (PCA). The three Patella species showed substantial morphology variability. P. rustica was easily recognized due to small brown spots near the shell apex. P. ferruginea (lamarckii form, rouxii form) were well identified from the other Patella species but for P. caerulea, a high morphological variability was noted between us in studied localities.
International Journal of Environmental Research and Education, 3(1) 17-25, 2022
This present paper made it possible to update the inventory of benthic malacofauna in the soft bo... more This present paper made it possible to update the inventory of benthic malacofauna in the soft bottoms of gulf of Oran. Samples of macrobenthic fauna were collected and separated from the Molluscs from other zoological groups. 116 Molluscs inventoried and determined by the species, including 13 orders, 20 families, 24 genuses and 29 species. Bivalvia is represented better than Gastropoda with respectively, 24 and 5 species. The analyzed taxa highlighted the dominant and main species on the bottom of the study sites, including Nuculana commutata, which appeared as the major species, followed by Nucula sulcata with respectively 23,46% and 12,34%. The present inventory indicates that the malacological fauna is less diversified than in the other zones studied of the Algerian coast.
J. Black Sea/Mediterranean Environment Vol. 28, No. 1: 78-96 , 2022
Research of benthic macrofauna of the Algerian west coasts is generally rare and mainly concerns ... more Research of benthic macrofauna of the Algerian west coasts is generally rare and mainly concerns a single species. The present work created an inventory of the macrobenthos explaining their distribution in the eastern sector of the Gulf of Oran. A total of 506 individuals sampled at 14 sites in winter 2019 were identified as four main taxa (279 polychaetes, 154 crustaceans, 41 echinoderms, and 32 molluscs). The taxonomic analysis made it possible to inventory 112 species (25 polychaetes, 61 crustaceans, 18 molluscs and 8 echinoderms). Polychaetes were dominant in all stations. Four bio-sedimentary facies (sand, sanded gravel, graveled sand and gravel) were identified by Ascending Hierarchical Classification, diversity indices, and sedimentary analysis and the zoological and ecological characteristics of the main soft-bottom communities of the study area were described.
A total of 46 samples were taken in the softbottom of the Gulf of Oran, in order to study the nat... more A total of 46 samples were taken in the softbottom of the Gulf of Oran, in order to study the nature of the sediments and the spatial distribution of the mollusc communities. As a result of sampling in the study area, at depth range (30 m-106 m), a total of 29 species were identified, included in two classes: Gastropoda and Bivalvia. The use of multivariate statistical analyzes, as well as particle size analysis, made it possible to identify the main mollusc communities. Six mollusc communities were defined from faunistic and sedimentologic affinities. The malacological fauna of the Gulf of Oran is dominated by Saccella commutata (33.33%), Limatula subauriculata (20.83%) and Nucula sulcata (20.83%). The main ecological stocks are mixicole and coastal detritus species. The malacofauna of the Gulf of Oran is scarce and less diversified due to the nature of the soft bottoms (sand and gravel) and the absence of terrigenous inputs.
Ukrainian Journal of Ecology, 11(8), 167-171, 2021
This present work dealing with the study of the growth of a microalgae of economic interest, whic... more This present work dealing with the study of the growth of a microalgae of economic interest, which proliferates in the salines of Arzew in western Algeria. Dunaliella salina is a microalgae endemic to these salty environments. Samples were collected and maintained as a pure culture of isolated Dunaliela salina. The aim of this study, is to establish a first reference state of the environments of the Salines of Arzew, and to find the best conditions for the development of this microalgae under experimental conditions. Two main ecological parameters (light and salinity) that influence the production of its biomass are studied. The site renowned for its richness in crustaceans of the genus Artemia salina and an important algal biomass, receives a large population of greater flamingo Phoenicopterus roseus. The water's salinity at the sampling site was 188 gr/l. The chlorophyll concentration and cell density were greater than 110 µg/l, and 2 × 10 6 cells/l respectively. The experimental results obtained demonstrated that the light intensity (18,000 lux) is the most influential parameter, followed by the number of days of algal culture. A cell concentration of 5.29 × 10 6 cells/l, is noted after 20 days of culture.
Bionomical research on the continental shelf of the Oran's Gulf enabled us to study the Annelida ... more Bionomical research on the continental shelf of the Oran's Gulf enabled us to study the Annelida macrofauna. Sampling sites were selected according to the bathymetry, which was divided into eight transects. Collected samples with the Aberdeen grab separated the Polychaeta Annelids from other zoological groups. 1571 Annelida Polychaeta were inventoried and determined by the species, including ten orders (Amphinomida, Capitellida, Eunicida, Flabelligerida, Ophelida, Oweniida, Phyllodocidae, Sabellida, Spionida, Terebellidae), 24 families, 84 genus and 74 species. Th e analyzed taxa highlighted the dominant and main species on the bottom of the Gulf, including Hyalinoecia bilineata, which appeared as the major species, Eunice vittata, Chone duneri, Glycera convoluta, Hyalinocea fauveli, Pista cristata, Lumbrinerris fragilis and Chloeia venusta.
The present work was organized to evaluate the trace metal
contaminations of Cu, Cd, Pb, Zn, and ... more The present work was organized to evaluate the trace metal contaminations of Cu, Cd, Pb, Zn, and Ni in the organs of Holothuria tubulosa (Gmelin, 1791), at two sites on the Algerian west coast; Ain Franine (AF) and Sidi Lakhdar (SL). The obtained concentrations revealed the presence of heterogeneous metal contents and showed that the most important concentrations were relatively detected in zinc, with values of the male gonads at the level of AF (16.39 ± 2.38 mg / kg PF) for winter and SL (4.65 ± 0.59mg / kg PF) for summer. The lowest zinc values were recorded on the integument for the two sites. The highest Cu values were recorded in spring on the integument of two groups of Holothuria tubulosa. Nickel concentrations showed a high value in the integuments in males (1.08 ±0.03mg / kgP.F) at AF during summer and at SL in spring (0.93 ± 0.02mg / kg PF). While they recorded the lowest values in winter for sea cucumbers of FA and in spring for those of SL for the same organ. The lead concentrations revealed high values on the integument with (1.77 ± 0.56 mg / kg PF) in winter for SL sea cucumbers and (1.36 ± 0.04 mg / kg PF) in summer for those from AF. Moreover, cadmium targeted the same organ as lead where high values were noticed on the integuments during fall for the two communities of sea cucumbers of the order of (0.51 ± 0.03 mg / kg PF) to AF and from (0.43 ± 0.01mg / kg PF) to SL. The analysis of the metal concentrations obtained revealed that, despite the difference in biotope, the two communities of Holothuria tubulosa did not present a significant difference (P> 0.005) for all the metals considered.
Ukrainian Journal of Ecology, 2021, 11(4),1-4, 2021
This present work dealing with the study of the benthic community in the Oran's Gulf permits an o... more This present work dealing with the study of the benthic community in the Oran's Gulf permits an overview of the macrobenthos encountered in this area, which seems to be more or less threatened by industrial and urban pollution. This study aimed to establish an initial reference state of coastal environments to contribute to the knowledge necessary for their sustainable management. The inventory of the macrobenthic fauna of the Gulf of Oran carried out in 2019 identified 618 macrobenthic individuals, divided into four taxa (531 polychaetes, 38 crustaceans, 31 mollusks, and 18 echinoderms), distributed in 8 sites. The taxonomic diversity included 60, 23, 15, and 9 species of polychaetes, crustaceans, mollusks, and echinoderms, respectively. All this information obtained made it possible to estimate the diversity of macrobenthic invertebrates and characterize the main communities in the coastal sea bed of the Gulf's Oran.
Zoology and Ecology, 2021, Volume 31, Number 1, 2021
Freshwaters are among the most threatened ecosystems, particularly in North Africa where urbaniza... more Freshwaters are among the most threatened ecosystems, particularly in North Africa where urbanization and climate change are exerting an important pressure on aquatic fauna. Longterm investigation of macroinvertebrates is one of the best ways of tracking and understanding the influence of environmental and anthropogenic pressures on community dynamics. In this study, we focus on determining the community structure and diversity of benthic macroinvertebrates as well as the state of aquatic physicochemical parameters in the Bouhamdane Stream, near the outlet of Bouhamdane dam, Seybouse watershed, north-eastern Algeria. We carried out a bi-monthly sampling of macroinvertebrates and nine water physicochemical parameters from September 2017 to July 2018 at three sites. Results show that the collected macroinvertebrates (6756 individuals) belong to 15 families and 12 orders. The abundance of the macrofauna consisted of 88.19% crustaceans, 7.74% insects, 3.7% molluscs and 0.16% annelids. Physicochemical analyzes (depth, turbidity, pH, dissolved O2, temperature, salinity, and conductivity) showed variability among sites. The families of Gammaridae and Baetidae were the most frequent and the most abundant on all the stations. The results indicate that aquatic macroinvertebrates constitute good indicators of the biological quality of water. This study shows that even with the occurrence of regular dam water discharge, the macroinvertebrate community is still able to persist either through adaptation to high water velocity or high colonization rate.
Recently, there is a great deal of attention for natural products due to its possible medicinal v... more Recently, there is a great deal of attention for natural products due to its possible medicinal values. Its effectiveness has been proved through a several studies in defeating some diseases. The present study aimed to investigate the antioxidant, antibacterial and antifungal activities of Urtica urens from Western Algeria. Leaves and roots were extracted with 80 % Ethanol and water. The 2.2-diphenyl-1-picrylhydrazyl (DPPH) and β-carotene bleaching tests were used to assess the antioxidant activity in addition to polyphenols analysis, while the agar well diffusion were used to screen the antimicrobial activity against some Gram-positive, Gram-negative bacteria and the fungi. Among the studied extracts, hydroalcoholic extracts of leaves and roots presented the highest total phenolic values (26.2 and 20.9 mg GAE/g), flavonoids with (15.7 and 12.2 mg quercetin/g) and condensed tannins with (56.4 and 30.1 mg GAE/g), compared to the water extracts. Once again, the 80 % ETOH leaves exhibited the highest antioxidant capacity with an IC 50 of 2.59 mg/ml, followed by the water leaves with an IC 50 of 6 mg/ml. On the other hand, the hydroalcoholic extracts exhibited the highest inhibition of βcarotene bleaching with 42.6 % to the roots and 37.9 % to the leaves. The ETOH leaves and ETOH roots of U. urens were the most effective extracts being able to repress the growth of the pathological tested strains including fungi. Therefore, it is recommended the use of U. urens that has been poorly recognized for a long time by the population of the selected region.
Ukrainian Journal of Ecology, 2021, 11(3), 22-25,, 2021
Macroalgae are very abundant organisms in the Algerian coastal zone and not well-known on the wes... more Macroalgae are very abundant organisms in the Algerian coastal zone and not well-known on the west coast of Algeria. The research aimed to identify marine macroalgae in Ain Témouchent littoral (northwest Algeria). A checklist of macroalgae, based on new collections, is given. Using present-day taxonomy, sampling species of macroalgae have been identified to date. The results showed that 32 marine macroalgae were found and identified. They are divided into 3 taxa: Chlorophyta (4 orders, 5 families, 7 genera, 8 species), Ochrophyta (4 orders, 4 families, 6 genera, 8 species) and Rhodophyta (9 orders, 11 families, 13 genera, and 16 species). Some species are remarkable for their endemism and their character as indicators of disturbance of the marine environment, and others of its good quality, excellent protection, and preservation. We annotated the presence of the Cystoseira stricta, which is reliable indicator of a healthy marine environment. We concluded that the invasive species are rarely present in this area.
Generally, the benthic aquatic macroalgae is not well-known in the west coast of Algeria. In this... more Generally, the benthic aquatic macroalgae is not well-known in the west coast of Algeria. In this study, a revised checklist of macroalgae of algerian west coast with an updated nomenclature and taxonomy has been update. Using currently accepted names, 22 species and infraspecific taxa of macroalgae have been identified , including Chlorophyta (3orders / 4 families / 6 genera / 8 species), Ochrophyta (4 orders/ 4 families / 5 genera / 5 species), and Rhodophyta (7 orders / 7 families / genera / 7 species). The algal diversity of the algerian west coast within the Arzew Gulf is less than that within the Gulf of Oran. The Rhodophyceae occupy the most important average coverage (47.80%), followed by Chlorophyceae (33.06%) and Pheophyceae (19.14%). Given that this is the first inclusive checklist of macroalgae of west coast, it could serve as a foundation for future phycological and biogeographical studies of the taxa in the country and the region.
Counts carried out over two consecutive years (from September 2017 to August 2019) of waterbirds ... more Counts carried out over two consecutive years (from September 2017 to August 2019) of waterbirds occupying the Lac des Oiseaux (Ramsar site, wilaya of El-Tarf, extreme northeastern Algeria) showed a species richness estimated at 38 waterbird species belonging to 11 families. The Anatidae and Scolopacidae with 10 and 7 species respectively are the most families represented. The former are mainly observed during the wintering season and the latter during the summer period. From an effective point of view, Anatidae and Rallidae, mainly the Eurasian Coot Fulica atra are the most abundant. From a phenological point of view, eleven species are summering, ten are resident and wintering and eight are sporadic species.
The present study investigates the parasitic biodiversity of the Axillary seabream Pagellus acarn... more The present study investigates the parasitic biodiversity of the Axillary seabream Pagellus acarne (Risso, 1827), which were caught in western Algeria (western Mediterranean). The examination of 104 fishes landed in the port of Béni Saf, resulted in the identification of 440 individuals of parasites. Our study identified 5 species of Nematodes parasitizing the digestive system: Anisakis physeteris, Hystetothylacium fabri, Hysterothylacium aduncum, Hysterothylacium sp., Cucullanus sp., which belong to two large families: Anisakidaes and Cucullanidaes. The Hysterothylacium fabri species were well represented in our samples (63,46%). We have also identified Tetraphyllidea larvae of the Scolex pleuronectis with a prevalence of 23.07%. In addition to the presence of the Anisakis physeteris for the first time on the Algerian coast. Keywords: Parasites; Pagellus acarne; Sparidae; Western Algeria; Mediterranean.
Journal of Survey in Fisheries Sciences, 11(2) 30-36, 2024
A biometric study was conducted on a benthic fish of the family Congridae, the European conger ee... more A biometric study was conducted on a benthic fish of the family Congridae, the European conger eel (Conger conger Linnaeus, 1758), from the western coasts of Algeria, from Béni-Saf. This study was carried out due to the total absence of reliable and exploitable information concerning the morphometric characteristics of this fish along the Algerian coast. It was based on statistical processing of 18 morphometric variables measured on each sampled fish. the comparison between months using univariate ANOVA and multivariate MANOVA statistical tests showed significant differences in morphometric variables measured on the European conger eel (Conger conger). However, regarding the sex factor, no significant differences were observed between males and females.
This present paper presents an inventory of benthic Malacostraca in the Gulf of Oran. The softbot... more This present paper presents an inventory of benthic Malacostraca in the Gulf of Oran. The softbottom crustacean fauna was studied between February 2021 and September 2021. Samples were collected from 8 coastal stations. The class Malacostraca was represented with 2 subclasses, Eumalacostraca and Phyllocarida. Sixty-one species and 290 individuals belonging to seven crustacean orders (Amphipoda, Decapoda, Isopoda, Tanaidacea, Mysida, Lophogastrida and Leptostraca) were identified. Amphipoda were represented with the highest number of species (36) followed by Decapoda (11) and Isopoda (6). Tanaidacea and Mysida were poorly represented, with 3 and 2 species, respectively. Lophogastrida and Leptostraca were both represented by only one species. Among the crustaceans encountered, Ampelisca was the most dominant genus. The present inventory indicates that the carcinological fauna in the Gulf of Oran is less diversified than it is in other zones that have been studied on the Algerian coast (Gulf of Arzew, Bay of Bou-Ismail, and Bay of Algiers).
The pink spiny lobster, Palinurus mauritanicus Gruvel, 1911 is a target species of commercial fis... more The pink spiny lobster, Palinurus mauritanicus Gruvel, 1911 is a target species of commercial fisheries along the Algerian west coast. To better understand the natural diet of a population of P. mauritanicus, a study was conducted between June 2021 and May 2022, which aimed to compare the consumed food items based on sex, seasonality, and body size. This approach involved analysing stomach contents and determining ingested prey, with seasonal sampling conducted at three main fishing ports (Béni Saf, Bouzedjar and Oran). The results showed that fish (in general "Pisces", but only Osteichthyes retrieved) (46.42%), Crustacea (34.28%), Annelida Polychaeta (23.33%), and Mollusca (18.57%) were the major components of the lobster's diet. Echinodermata (8.57%), Porifera (2.38%) and Bryozoa (0.95%) were classified as minor groups. We also showed that sex and season affected the prey items consumed by the lobster. Based on the vacuity index, the pink spiny lobster was found to be feeding intensively in spring and decreasingly so in summer, autumn and winter. These results indicate that the pink spiny lobster is to be characterized as an omnivorous generalist and opportunist.
Journal of Survey in Fisheries Sciences: 10(1) 1-11, 2023
The sardine (Sardina pilchardus) is the most popular species for fishing of the Algerian coast. F... more The sardine (Sardina pilchardus) is the most popular species for fishing of the Algerian coast. Five toxic metals zinc (Zn), cadmium (Cd), copper (Cu), lead (Pb), and iron (Fe) that can affect human health are studied in this fish. Samples are collected monthly between January and December 2019 in the Ghazaouet bay. The collected samples were analyzed by atomic absorption spectrophotometry by sex and for two organs (gonads and gills). For all the male and female samples, Zn and Fe showed the highest values, respectively (1.00±0.406 mg/kg.FW and 0.770±0.28 mg/kg.FW), however the low values concern Cu (0.017 mg/kg.FW). Zn and Cd contents are higher in the gonads, and those of Fe and Pb are higher in the gills. However, Cu concentrations are similar in both organs (gonads and gills). Statistical analysis recorded a significant difference (p<0.05) for all metals (Zn, Pb, Fe and Cd) except for Cu (p> 0.05) between the two organs. S. pilchardus may represent a hazard for consumers. S. pilchardus may represent a hazard for consumers, but a continuous monitoring of heavy metals is necessary to insure the prescribed worldwide limit.
Background and Objective: The characterization of sediment grain sizes and their spatial distribu... more Background and Objective: The characterization of sediment grain sizes and their spatial distributions are key input parameters to study the nature and texture of the seabed substrate. The aim for analysis of these parameters makes it possible to identify the distribution of sediments and a better understanding of the spatial distribution of benthic communities in the soft bottoms of the Gulf of Oran. Materials and Methods: Sediment samples were collected and studied from the sampling of 36 stations, ranging in depth from-30 to-106 m. All samples were analysed for their grain size distribution and statistical relationships. Results: The study area is mainly composed of sand and gravel. The sand content of the stations studied is between 19.14 and 89.71% and that of the gravel is between 80.0 and 2.14%. Most stations in the Gulf of Oran contain less than 5% muddy sediment. Five important sedimentary facies and a small zone of reduced mud are identified. Conclusion: Sand is found often mixed with gravel. The sediments of the stations near the coasts are very affected by urban and industrial pollution. The sediments at all stations are generally varied and influenced by hydrodynamics, turbidity and wave dynamics.
The deep-water rose shrimp, Parapenaeus longirostris (H. Lucas, 1846), is the most dominant shrim... more The deep-water rose shrimp, Parapenaeus longirostris (H. Lucas, 1846), is the most dominant shrimp species on the Algerian west coast. In that area, the diet of P. longirostris was studied between July 2020 and June 2021. This approach to the diet of the rose shrimp was based on analysis of the stomach contents and determination of the ingested prey. A seasonal sampling was carried out in the main fishing ports (Béni Saf, Bouzedjar, Oran and Mostaganem). The results obtained showed that the shrimp feed intensively in spring and increasingly less in winter and summer. Crustaceans, foraminiferans, polychaetes, and molluscs constituted the most frequent preys in the diet, with respective frequencies of 58.85, 55.95, 36.63 and 32.04%. Small microplancton and mesoplancton prey (radiolarians, copepods, and various larvae) were less important in the diet of P. longirostris. Fish and echinoderms constitute accidental prey, of which the frequency is less than 10%.
The characterization of Patella caerulea Linnaeus, 1758, P. rustica Linnaeus, 1758 and P. ferrugi... more The characterization of Patella caerulea Linnaeus, 1758, P. rustica Linnaeus, 1758 and P. ferruginea Gmelin, 1791 (Gastropoda Patellidae) has been a source of debate and controversy since they were proposed as species. This was due to the high shell variability, and some of them display intermediate characteristics. In the present work, samples of three species of Patella were examined and compared using several morphometric characters describing the shell and soft parts. 575 individuals of P. caerulea, 132 individuals of P. rustica, and 45 of P. ferruginea were sampled from Algerian West Coast. The biometry of the three species has been studied: length (L), width (Wi), height (H) of the shell and the weight (W) of every individual. A strong positive correlation was noted between these parameters for all three species. These parameters were used also for the Principal Component Analysis (PCA). The three Patella species showed substantial morphology variability. P. rustica was easily recognized due to small brown spots near the shell apex. P. ferruginea (lamarckii form, rouxii form) were well identified from the other Patella species but for P. caerulea, a high morphological variability was noted between us in studied localities.
International Journal of Environmental Research and Education, 3(1) 17-25, 2022
This present paper made it possible to update the inventory of benthic malacofauna in the soft bo... more This present paper made it possible to update the inventory of benthic malacofauna in the soft bottoms of gulf of Oran. Samples of macrobenthic fauna were collected and separated from the Molluscs from other zoological groups. 116 Molluscs inventoried and determined by the species, including 13 orders, 20 families, 24 genuses and 29 species. Bivalvia is represented better than Gastropoda with respectively, 24 and 5 species. The analyzed taxa highlighted the dominant and main species on the bottom of the study sites, including Nuculana commutata, which appeared as the major species, followed by Nucula sulcata with respectively 23,46% and 12,34%. The present inventory indicates that the malacological fauna is less diversified than in the other zones studied of the Algerian coast.
J. Black Sea/Mediterranean Environment Vol. 28, No. 1: 78-96 , 2022
Research of benthic macrofauna of the Algerian west coasts is generally rare and mainly concerns ... more Research of benthic macrofauna of the Algerian west coasts is generally rare and mainly concerns a single species. The present work created an inventory of the macrobenthos explaining their distribution in the eastern sector of the Gulf of Oran. A total of 506 individuals sampled at 14 sites in winter 2019 were identified as four main taxa (279 polychaetes, 154 crustaceans, 41 echinoderms, and 32 molluscs). The taxonomic analysis made it possible to inventory 112 species (25 polychaetes, 61 crustaceans, 18 molluscs and 8 echinoderms). Polychaetes were dominant in all stations. Four bio-sedimentary facies (sand, sanded gravel, graveled sand and gravel) were identified by Ascending Hierarchical Classification, diversity indices, and sedimentary analysis and the zoological and ecological characteristics of the main soft-bottom communities of the study area were described.
A total of 46 samples were taken in the softbottom of the Gulf of Oran, in order to study the nat... more A total of 46 samples were taken in the softbottom of the Gulf of Oran, in order to study the nature of the sediments and the spatial distribution of the mollusc communities. As a result of sampling in the study area, at depth range (30 m-106 m), a total of 29 species were identified, included in two classes: Gastropoda and Bivalvia. The use of multivariate statistical analyzes, as well as particle size analysis, made it possible to identify the main mollusc communities. Six mollusc communities were defined from faunistic and sedimentologic affinities. The malacological fauna of the Gulf of Oran is dominated by Saccella commutata (33.33%), Limatula subauriculata (20.83%) and Nucula sulcata (20.83%). The main ecological stocks are mixicole and coastal detritus species. The malacofauna of the Gulf of Oran is scarce and less diversified due to the nature of the soft bottoms (sand and gravel) and the absence of terrigenous inputs.
Ukrainian Journal of Ecology, 11(8), 167-171, 2021
This present work dealing with the study of the growth of a microalgae of economic interest, whic... more This present work dealing with the study of the growth of a microalgae of economic interest, which proliferates in the salines of Arzew in western Algeria. Dunaliella salina is a microalgae endemic to these salty environments. Samples were collected and maintained as a pure culture of isolated Dunaliela salina. The aim of this study, is to establish a first reference state of the environments of the Salines of Arzew, and to find the best conditions for the development of this microalgae under experimental conditions. Two main ecological parameters (light and salinity) that influence the production of its biomass are studied. The site renowned for its richness in crustaceans of the genus Artemia salina and an important algal biomass, receives a large population of greater flamingo Phoenicopterus roseus. The water's salinity at the sampling site was 188 gr/l. The chlorophyll concentration and cell density were greater than 110 µg/l, and 2 × 10 6 cells/l respectively. The experimental results obtained demonstrated that the light intensity (18,000 lux) is the most influential parameter, followed by the number of days of algal culture. A cell concentration of 5.29 × 10 6 cells/l, is noted after 20 days of culture.
Bionomical research on the continental shelf of the Oran's Gulf enabled us to study the Annelida ... more Bionomical research on the continental shelf of the Oran's Gulf enabled us to study the Annelida macrofauna. Sampling sites were selected according to the bathymetry, which was divided into eight transects. Collected samples with the Aberdeen grab separated the Polychaeta Annelids from other zoological groups. 1571 Annelida Polychaeta were inventoried and determined by the species, including ten orders (Amphinomida, Capitellida, Eunicida, Flabelligerida, Ophelida, Oweniida, Phyllodocidae, Sabellida, Spionida, Terebellidae), 24 families, 84 genus and 74 species. Th e analyzed taxa highlighted the dominant and main species on the bottom of the Gulf, including Hyalinoecia bilineata, which appeared as the major species, Eunice vittata, Chone duneri, Glycera convoluta, Hyalinocea fauveli, Pista cristata, Lumbrinerris fragilis and Chloeia venusta.
The present work was organized to evaluate the trace metal
contaminations of Cu, Cd, Pb, Zn, and ... more The present work was organized to evaluate the trace metal contaminations of Cu, Cd, Pb, Zn, and Ni in the organs of Holothuria tubulosa (Gmelin, 1791), at two sites on the Algerian west coast; Ain Franine (AF) and Sidi Lakhdar (SL). The obtained concentrations revealed the presence of heterogeneous metal contents and showed that the most important concentrations were relatively detected in zinc, with values of the male gonads at the level of AF (16.39 ± 2.38 mg / kg PF) for winter and SL (4.65 ± 0.59mg / kg PF) for summer. The lowest zinc values were recorded on the integument for the two sites. The highest Cu values were recorded in spring on the integument of two groups of Holothuria tubulosa. Nickel concentrations showed a high value in the integuments in males (1.08 ±0.03mg / kgP.F) at AF during summer and at SL in spring (0.93 ± 0.02mg / kg PF). While they recorded the lowest values in winter for sea cucumbers of FA and in spring for those of SL for the same organ. The lead concentrations revealed high values on the integument with (1.77 ± 0.56 mg / kg PF) in winter for SL sea cucumbers and (1.36 ± 0.04 mg / kg PF) in summer for those from AF. Moreover, cadmium targeted the same organ as lead where high values were noticed on the integuments during fall for the two communities of sea cucumbers of the order of (0.51 ± 0.03 mg / kg PF) to AF and from (0.43 ± 0.01mg / kg PF) to SL. The analysis of the metal concentrations obtained revealed that, despite the difference in biotope, the two communities of Holothuria tubulosa did not present a significant difference (P> 0.005) for all the metals considered.
Ukrainian Journal of Ecology, 2021, 11(4),1-4, 2021
This present work dealing with the study of the benthic community in the Oran's Gulf permits an o... more This present work dealing with the study of the benthic community in the Oran's Gulf permits an overview of the macrobenthos encountered in this area, which seems to be more or less threatened by industrial and urban pollution. This study aimed to establish an initial reference state of coastal environments to contribute to the knowledge necessary for their sustainable management. The inventory of the macrobenthic fauna of the Gulf of Oran carried out in 2019 identified 618 macrobenthic individuals, divided into four taxa (531 polychaetes, 38 crustaceans, 31 mollusks, and 18 echinoderms), distributed in 8 sites. The taxonomic diversity included 60, 23, 15, and 9 species of polychaetes, crustaceans, mollusks, and echinoderms, respectively. All this information obtained made it possible to estimate the diversity of macrobenthic invertebrates and characterize the main communities in the coastal sea bed of the Gulf's Oran.
Zoology and Ecology, 2021, Volume 31, Number 1, 2021
Freshwaters are among the most threatened ecosystems, particularly in North Africa where urbaniza... more Freshwaters are among the most threatened ecosystems, particularly in North Africa where urbanization and climate change are exerting an important pressure on aquatic fauna. Longterm investigation of macroinvertebrates is one of the best ways of tracking and understanding the influence of environmental and anthropogenic pressures on community dynamics. In this study, we focus on determining the community structure and diversity of benthic macroinvertebrates as well as the state of aquatic physicochemical parameters in the Bouhamdane Stream, near the outlet of Bouhamdane dam, Seybouse watershed, north-eastern Algeria. We carried out a bi-monthly sampling of macroinvertebrates and nine water physicochemical parameters from September 2017 to July 2018 at three sites. Results show that the collected macroinvertebrates (6756 individuals) belong to 15 families and 12 orders. The abundance of the macrofauna consisted of 88.19% crustaceans, 7.74% insects, 3.7% molluscs and 0.16% annelids. Physicochemical analyzes (depth, turbidity, pH, dissolved O2, temperature, salinity, and conductivity) showed variability among sites. The families of Gammaridae and Baetidae were the most frequent and the most abundant on all the stations. The results indicate that aquatic macroinvertebrates constitute good indicators of the biological quality of water. This study shows that even with the occurrence of regular dam water discharge, the macroinvertebrate community is still able to persist either through adaptation to high water velocity or high colonization rate.
Recently, there is a great deal of attention for natural products due to its possible medicinal v... more Recently, there is a great deal of attention for natural products due to its possible medicinal values. Its effectiveness has been proved through a several studies in defeating some diseases. The present study aimed to investigate the antioxidant, antibacterial and antifungal activities of Urtica urens from Western Algeria. Leaves and roots were extracted with 80 % Ethanol and water. The 2.2-diphenyl-1-picrylhydrazyl (DPPH) and β-carotene bleaching tests were used to assess the antioxidant activity in addition to polyphenols analysis, while the agar well diffusion were used to screen the antimicrobial activity against some Gram-positive, Gram-negative bacteria and the fungi. Among the studied extracts, hydroalcoholic extracts of leaves and roots presented the highest total phenolic values (26.2 and 20.9 mg GAE/g), flavonoids with (15.7 and 12.2 mg quercetin/g) and condensed tannins with (56.4 and 30.1 mg GAE/g), compared to the water extracts. Once again, the 80 % ETOH leaves exhibited the highest antioxidant capacity with an IC 50 of 2.59 mg/ml, followed by the water leaves with an IC 50 of 6 mg/ml. On the other hand, the hydroalcoholic extracts exhibited the highest inhibition of βcarotene bleaching with 42.6 % to the roots and 37.9 % to the leaves. The ETOH leaves and ETOH roots of U. urens were the most effective extracts being able to repress the growth of the pathological tested strains including fungi. Therefore, it is recommended the use of U. urens that has been poorly recognized for a long time by the population of the selected region.
Ukrainian Journal of Ecology, 2021, 11(3), 22-25,, 2021
Macroalgae are very abundant organisms in the Algerian coastal zone and not well-known on the wes... more Macroalgae are very abundant organisms in the Algerian coastal zone and not well-known on the west coast of Algeria. The research aimed to identify marine macroalgae in Ain Témouchent littoral (northwest Algeria). A checklist of macroalgae, based on new collections, is given. Using present-day taxonomy, sampling species of macroalgae have been identified to date. The results showed that 32 marine macroalgae were found and identified. They are divided into 3 taxa: Chlorophyta (4 orders, 5 families, 7 genera, 8 species), Ochrophyta (4 orders, 4 families, 6 genera, 8 species) and Rhodophyta (9 orders, 11 families, 13 genera, and 16 species). Some species are remarkable for their endemism and their character as indicators of disturbance of the marine environment, and others of its good quality, excellent protection, and preservation. We annotated the presence of the Cystoseira stricta, which is reliable indicator of a healthy marine environment. We concluded that the invasive species are rarely present in this area.
Generally, the benthic aquatic macroalgae is not well-known in the west coast of Algeria. In this... more Generally, the benthic aquatic macroalgae is not well-known in the west coast of Algeria. In this study, a revised checklist of macroalgae of algerian west coast with an updated nomenclature and taxonomy has been update. Using currently accepted names, 22 species and infraspecific taxa of macroalgae have been identified , including Chlorophyta (3orders / 4 families / 6 genera / 8 species), Ochrophyta (4 orders/ 4 families / 5 genera / 5 species), and Rhodophyta (7 orders / 7 families / genera / 7 species). The algal diversity of the algerian west coast within the Arzew Gulf is less than that within the Gulf of Oran. The Rhodophyceae occupy the most important average coverage (47.80%), followed by Chlorophyceae (33.06%) and Pheophyceae (19.14%). Given that this is the first inclusive checklist of macroalgae of west coast, it could serve as a foundation for future phycological and biogeographical studies of the taxa in the country and the region.
Counts carried out over two consecutive years (from September 2017 to August 2019) of waterbirds ... more Counts carried out over two consecutive years (from September 2017 to August 2019) of waterbirds occupying the Lac des Oiseaux (Ramsar site, wilaya of El-Tarf, extreme northeastern Algeria) showed a species richness estimated at 38 waterbird species belonging to 11 families. The Anatidae and Scolopacidae with 10 and 7 species respectively are the most families represented. The former are mainly observed during the wintering season and the latter during the summer period. From an effective point of view, Anatidae and Rallidae, mainly the Eurasian Coot Fulica atra are the most abundant. From a phenological point of view, eleven species are summering, ten are resident and wintering and eight are sporadic species.
The present study investigates the parasitic biodiversity of the Axillary seabream Pagellus acarn... more The present study investigates the parasitic biodiversity of the Axillary seabream Pagellus acarne (Risso, 1827), which were caught in western Algeria (western Mediterranean). The examination of 104 fishes landed in the port of Béni Saf, resulted in the identification of 440 individuals of parasites. Our study identified 5 species of Nematodes parasitizing the digestive system: Anisakis physeteris, Hystetothylacium fabri, Hysterothylacium aduncum, Hysterothylacium sp., Cucullanus sp., which belong to two large families: Anisakidaes and Cucullanidaes. The Hysterothylacium fabri species were well represented in our samples (63,46%). We have also identified Tetraphyllidea larvae of the Scolex pleuronectis with a prevalence of 23.07%. In addition to the presence of the Anisakis physeteris for the first time on the Algerian coast. Keywords: Parasites; Pagellus acarne; Sparidae; Western Algeria; Mediterranean.
The 6th International Congress of the Animal Populations & Communities «ICAPC 6» «Environment, Biodiversity and Resource Management" From 08th to 10th October 2022 DJANET, ALGERIA, 2022
Island Rachgoun is a major component of the insular complex in the west of Algeria. Rachgoun Isla... more Island Rachgoun is a major component of the insular complex in the west of Algeria. Rachgoun Island is an island located in the Mediterranean Sea off the coastal town of Béni Saf in the wilaya of Ain Témouchent in Algeria. The island was in the past an ancient trading station for the Punic, a Phoenician group living in the western Mediterranean, and is the main wintering site for several bird species which rest and nest in very large numbers during their migration between Eurasia and Africa. The present study on the island of Rachgoun has made it possible to characterize the marine habitat, to evaluate its ecobiological potential containing plant and animal species remarkable for their endemism, their rarity, and their vulnerability, but undergoing strong anthropogenic pressures which strongly indicate the need and urgency to initiate protection measures. Human interventions have degraded the ecological and physical integrity of the island and its fragile ecosystem. The Rachgoun island answers perfectly the whole of the marine criteria of selection of Marine Protected Areas (MPA), recognized and admitted by the regional authorities.
International seminar on biodiversity in Algeria « Richness and Conservation » ISBA1_RC in Algeria Oum El-bouaghi : September 25 – 26 2022, 2022
Les macroinvertébrés sont un maillon important de la chaîne alimentaire des espèces aquatiques. ... more Les macroinvertébrés sont un maillon important de la chaîne alimentaire des espèces aquatiques. Ils sont une source de nourriture primaire pour plusieurs espèces de vertébrés. De plus, ils sont reconnus comme de bons indicateurs de la santé des écosystèmes aquatiques en raison de leur grande diversité et de leur tolérance variable à la pollution et à la dégradation des habitats. Les recherches sur la macrofaune benthique des côtes ouest algériennes sont généralement rares, fragmentaires et concernent pour la plupart l'étude d'une seule espèce. Le but de cette étude, est d'établir un premier état de référence des milieux côtiers afin de contribuer aux connaissances nécessaires à leurs gestions durables. L'inventaire des macroinvertébrés de la côte ouest algérienne et la collecte de données (investigation, enquêtes, revue d'archives, observation participante) s'étalant sur une période de 10 (2010/2020), ont permis d'identifier un total de 1002 espèces macrobenthiques, réparties en 3 taxons : 565 mollusques, 342 crustacés et 95 échinodermes. 174, 164, 350 et 314 espèces ont été recensées respectivement dans les sites de Mostaganem (S1), Oran (S2), Ain Témouchent (S3) et Tlemcen (S4). L'analyse et l'exploitation de l'inventaire des espèces identifiées réalisé permet de définir le zonage géographique et les types d'habitats prioritaires pour la conservation de la biodiversité dans les zones côtières, et de comprendre la place des macroinvertébrés dans le fonctionnement des ressources biologiques, pour identifier ses valeurs écologiques et les perturbations causées par les activités anthropiques. Les résultats obtenus ont permis d'estimer la diversité des invertébrés macrobenthiques et de caractériser les principales communautés.
Séminaire International sur les sciences de la terre et de l’univers, 2021
The deep-water rose shrimp, Parapenaeus longirostris (Lucas, 1846) is one of the Decapod crustace... more The deep-water rose shrimp, Parapenaeus longirostris (Lucas, 1846) is one of the Decapod crustacean species that is targeted by coastal and deep-sea demersal fisheries in the western Mediterranean, in the Algerian west coast in particular. Despite its socio-economic importance and commercial interest across the country, there were only few studies focusing on its biology and ecology and no species development plan has been drawn up for now. Our study of the rose shrimp diet was based on the analysis of the faunistic composition of the ingested prey. Seasonal sampling was carried out at Béni Saf port (western Algeria) during 2018-2019, from landings from inshore trawling fisheries. A total of 641 individuals were analyzed, while taking account of males and females and size classes. 2550 introduced preys are identified, starting from the examined stomachs, of which 55 are empty. The average number of preys per stomach is 3.97 %. Results of stomach content analyzes showed a wide range of benthic and endobenthic species. Crustacea are the preferred prey (F=77.69%), followed by Foraminifera, Annelida Polychaeta, and Mollusca with respective frequencies of (77.22%, 58.50% and 52.73%). Radiolaria, Porifera and Echinodermata represent a less important part in the diet of this species and constitute accidental prey, whose frequency is less than 10%. Benthic organisms with silt ingest the plant and various debris, which are the secondary prey with an average frequency of 14.81%. Results show that the shrimps nourish themselves intensively in spring and more in less in winter and summer, which corresponds to a significant food activity, for the constitution of concerning the reproduction.
Célébration de la journée mondiale des Zones Humides, 2020
Une zone humide, dénomination dérivant du terme anglais « wetland », est une région où le princip... more Une zone humide, dénomination dérivant du terme anglais « wetland », est une région où le principal facteur d'influence du biotope et de sa biocénose est l'eau. Les différents types de zones humides sont aussi nombreux que variés, qu’elles soient continentales ou côtières, naturelles ou artificielles, d’eaux douces, saumâtres ou salées. Les zones humides naturelles sont essentielles pour la biodiversité et pour les populations exploitant leurs ressources ou bénéficiant de leurs services (OZHM, 2015). Pour rappel, un traité mondial a été signé le 2 février 1971 à Ramsar (Iran) pour la conservation et l'utilisation rationnelle et durables des zones humides. 169 pays à travers le monde dont l'Algérie en 1982, ont ratifié ce traité qui constitue l'un des principaux fondements de la conservation des zones humides. La convention de Ramsar considère que la biodiversité est un point capital pour qu'une zone humide soit considérée d'importance internationale. Les zones humides représentent seulement 1% de la superficie mondiale. Cependant, on y trouve 40% des espèces vivantes. En dépit de tous les services qu’elles rendent à l’humanité, les zones humides figurent au premier plan des victimes expiatoires de la biodiversité. Dans de nombreuses régions de la Méditerranée, les zones humides ont été asséchées et transformées à des fins agricoles ou urbaines, ou suite à des politiques visant à améliorer les conditions sanitaires par l’élimination de foyers de maladies comme le paludisme. Depuis la ratification de cette convention par l'Algérie, de nombreuses activités ont été menées, pour une meilleure gestion de ces sites et leur valorisation à travers des plans de gestion, des inventaires ainsi qu'un suivi permanant de leur dynamique écologique. L’Algérie avec une superficie classée près de 3 millions d’hectares, est le troisième pays en Afrique, après le Botswana et son fameux Delta de l’Okavango qui fait 6.8 millions d’hectares et la Tanzanie avec 3.5 millions d’hectares, et la huitième dans le monde après le Canada (13 millions ha), la Russie (10,3 millions ha), l’Australie (5.2 millions ha), le Brésil (4,5 millions), le Pérou (2,9 millions) et les Etats-Unis (DGF, 2004). Le contexte actuel de la région ouest algérienne, notamment les conditions écologiques et environnementales, est tel que les zones humides de la région se trouvent dangereusement affectées. Il s’avère, par conséquent, nécessaire de mettre en place un Plan de Gestion Durable de ces écosystèmes fragilisés par les aléas climatiques et par les actions anthropiques. C’est dans ce contexte que s’inscrit notre communication, dont l’objectif est donc de dresser l’état des lieux des zones humides de l’Ouest algérien, afin de servir de base, lors de l’élaboration des différents plans régionaux de Gestion des Ressources Naturelles des zones humides.
6ème Congrès Franco-Maghrébin de Zoologie , 19èmes Journées Annuelles de la SZF - Paris 2018 , 2018
Les parasites de poissons d’eaux profondes sont des indicateurs de la biodiversité dans ces écosy... more Les parasites de poissons d’eaux profondes sont des indicateurs de la biodiversité dans ces écosystèmes souvent inaccessibles par d’autres moyens( Klimpel et al., 2010). Micromesistius poutassou abriterait 22 espèces appartenant à six différents groupes zoologique (Valero et al.,2000; Fernandez et al., 2005) Ce travail, est un inventaire des parasites du merlan bleu de la côte oranaise, avec leur identification au plus bas niveau taxonomique possible.
6ème Congrès Franco-Maghrébin de Zoologie et aux 119èmes Journées Annuelles de la SZF - Paris, 2018
Le présent travail vise à montrer l’intérêt d’utilisation des techniques SIG pour l’élaboration ... more Le présent travail vise à montrer l’intérêt d’utilisation des techniques SIG pour l’élaboration de plan d’aménagement pour des sites côtiers sensibles de l’Ouest algérien. La base de données exploitée se compose de variables socioéconomiques, de paramètres océanographiques, sédimentologiques et biologiques ( flore et faune ). les techniques SIG sont utilisées dans une première phase pour la cartographie et l’analyse de la distribution spatiale de chaque paramètre à part . L'étude des patterns spatiaux et temporels des organismes ainsi que le développement des bases de données permettant le stockage d'une grande quantité d'information, a ravivé l'exploitation de données biogéographiques existantes.
Le 6e Congrès franco–maghrébin de zoologie - Les 119es Journées annuelles de la Société zoologique de France, 2018
Les produits halieutiques sont un réservoir d’agents infectieux présents naturellement dans le mi... more Les produits halieutiques sont un réservoir d’agents infectieux présents naturellement dans le milieu aquatique ou introduits à travers l’activité anthropique. Mullus barbatus (Linné, 1758) est un poisson téléostéen de la famille des Mullidae, d’intérêt commercial important, capturé dans différents secteurs et à différentes profondeurs au niveau des côtes occidentales algériennes (Bekada, 2014). C’est une espèce démersale indicatrice de pollution, contaminée après avoir été capturée ou pendant son transport vers les différents marchés de détail (Alparslan et al., 2014). Sa qualité et sa fraicheur sont détériorées à travers des mécanismes microbiens et biochimiques (Al-Jasser et Al-Jasass, 2014). L’objectif de ce travail est basé sur la comparaison de la qualité bactériologique des spécimens de M. barbatus capturés dans le port d’Oran et achetés sur le marché afin de détecter l’introduction de bactéries post-capture (flore aérobie mésophile, CF, S. aureus et Salmonella).
Le 3ème Workshop International sur la Biodiversité et la Gestion des Ecosystèmes Exploitées - Alger le 27 octobre , 2018
Les zones humides côtières sont parmi les écosystèmes aquatiques les plus productifs et re... more Les zones humides côtières sont parmi les écosystèmes aquatiques les plus productifs et représentent un intérêt majeur. Cependant elles sont gravement menacées par les actions anthropiques et les changements climatiques. La flore algale répond parfaitement aux variations de l’environnement biotique et abiotique et représente ainsi un indicateur sensible de ses changements. L’objectif de notre étude, est d’évaluer les caractéristiques et la répartition actuelle de la flore algale des zones humides côtières de l’Ouest algérien et de définir les conditions de leur répartition. À plus long terme, cette étude apportera une meilleure connaissance des préférences écologiques de ces organismes et de leur abondance, et permettra de mieux évaluer le stress environnemental de la côte oranaise. Mots-clés: Flore algale, distribution spécifique, distribution spatiale, biosurveillance, stress environnemental, zones humides, Ouest algérien.
2ème Congrès International sur la Biodiversité Végétale – Marrakech – Maroc, les 27- 29 Mars 2014., 2014
Le lac Sidi M'hamed Benali est un site stratégique du point de vue environnemental, touristique e... more Le lac Sidi M'hamed Benali est un site stratégique du point de vue environnemental, touristique et socio-économique. Plusieurs études sont menées à son profit : granulométrie, évaluation de la qualité de son eau, inventaire faunistique, planctonique et floristique. Différents secteurs ont proposé des plans de gestion et d'aménagement du site selon l'importance de l'objectif à atteindre. La collecte des données (2002-2010) a permis de structurer les informations à l'aide d'un S.I.G. prêtant usage au logiciel MapInfo version 8.0. De ce fait, on a pu mettre en place une base de données facile à manipuler et créer une carte synthétique à la disposition des utilisateurs en vue d'un développement durable de cet habitat unique dans la région de Sidi bel abbès. Toutefois, la nécessité d'une contribution de la part des autorités et de la société civile est recommandée pour l'entretien et la conservation du lac au profit de la nature et des générations futures. Mots clés: Lac M'hamed Benali, biodiversité, SIG, base de données, aménagement touristique. Le lac Sidi Mohamed Benali, est considéré comme l'une des plus importantes réserves naturelles de la wilaya. Vu son rôle et son impact à l'échelle régionale, en matière d'écologie et de loisirs, il doit être considéré comme une importante réserve naturelle à protéger et à développer Matériel et méthodes Résultats Conclusion Le diagnostic environnemental du lac révèle que les sédiments sont sablono-argileux, l'eau contient quelques germes et éléments minéraux et organiques de quantités variables et il possède une richesse biologique considérable. L'application d'un SIG nous a permis l'élaboration d'une base de données accompagnée de la carte synthétique bio sédimentaire pour un suivi, une mise à jour, une prise de décision du milieu. Ainsi, cette base de données est accessible aux utilisateurs.
Journées internationales ‘’ Dragages, produits de draguages et développement durable ‘’, Hammamet, Tunisie du 16 au 19 février. , 2012
Bien qu'un peu moins de 1% de l'eau potable consommée dans le monde soit produite à partir du des... more Bien qu'un peu moins de 1% de l'eau potable consommée dans le monde soit produite à partir du dessalement, les perspectives offertes par cette technologie sont inexorablement grandissantes. • En effet, 40 % de la population mondiale vit à moins de 70 kilomètres d'une côte, soit la zone d'utilisation raisonnable du dessalement. • 17 000 unités de production d'eau potable, soit 51 millions de m 3 /jour d'eau produite, la production d'eau dessalée devrait atteindre 109 millions de m 3 /jour en 2016. • La technologie de l'osmose inverse, qui constituait 20% des unités de production au début des années 1980, s'impose aujourd'hui.
Journées internationales ‘’ Dragages, produits de draguages et développement durable ‘’, Hammamet, Tunisie du 16 au 19 février. , 2012
La concentration démographique dans les communes littorales
oranaises a connu une importante ex... more La concentration démographique dans les communes littorales
oranaises a connu une importante expansion pendant la dernière décennie.
En effet, un inquiétant volume d'eaux usées se jette annuellement sur le littoral oranais. Ceci éclaircit l’importance, le sérieux et la gravité
de ce problème sur l’ensemble de l'écosystème marin et les stocks
halieutiques.
Le 1er Congrès International sur l'environnement, la biodiversité et le développement durable: CIEBDD'2016, 2021
Le milieu marin est un environnement phylogénétiquement très diversifié et pourtant seulement esp... more Le milieu marin est un environnement phylogénétiquement très diversifié et pourtant seulement espèces formellement décrites sont marins (Biggs, 1994). Les mollusques entre autres les gastéropodes, leur vaste répartition dans le monde et leur importance biologique, ont depuis toujours suscité l’intérêt des scientifiques vu qu’ils sont situés à plusieurs niveaux de la biologique, ont depuis toujours suscité l’intérêt des scientifiques vu qu’ils sont situés à plusieurs niveaux de la chaine trophique, ce qui accroit d’avantage leur rôle déterminant dans le fonctionnement des écosystèmes. Parmi ces gastéropodes, le genre Patella, qui regroupe plusieurs espèces dont 5 Bien que ces espèces se partagent le littoral rocheux, elles possèdent des caractéristiques écologiques et morphologiques bien différentes. qui dépendent essentiellement des caractéristiques biologiques intrinsèques des espèces, des conditions hydrodynamiques du milieu et de l’impact de différentes forces évolutives.
1er Colloque International d'Ecophysiologie Animale et Biodiversité, 2016
Au terme de cette étude, neuf espèces de Nématodes ont été inventoriées:-Cet inventaire, non exha... more Au terme de cette étude, neuf espèces de Nématodes ont été inventoriées:-Cet inventaire, non exhaustif, ouvre des perspectives sur une connaissance plus approfondie de l'ichtyofaune de haute mer , car les connaissances concernant les grandes bathymétries demeurent encore insuffisantes. Introduction Les parasites de poissons de haute mer représentent le moyen le plus fiable de récolte d'informations sur la biodiversité des écosystèmes profonds souvent inaccessibles par d'autres moyens-Ce travail, est un inventaire des Nématodes parasites de poissons gadidés de la côte oranaise, Phycis blennoides, Phycis phycis Mora moro et Micromesistius poutassou suivi d'une étude écologique du parasitisme afin d'établir autant que possible des liens entre la cinétique des infra populations de Nématodes, les milieux hôtes, géographiques ainsi que les fluctuations saisonnières.
Congrès International "Estuaires et Aires Marines Côtières Protégées, (ECPA 2014), Izmir-Turquie du 04 au 06 Novembre., 2014
La répartition des Echinodermes sur les fonds des côtes oranaises, a fait l’objet d’une étude bio... more La répartition des Echinodermes sur les fonds des côtes oranaises, a fait l’objet d’une étude bionomique qui s’inscrit dans le cadre d’un programme de surveillance de cet environnement côtier soumis à de fortes actions anthropiques. Une cinquantaine stations ont été échantillonnées couvrant l’ensemble du golfe d’Oran. Les stations se répartissent selon la bathymétrie de – 30 m à – 110 m. Deux coups de benne Aberdeen par station sont effectués pour le prélèvement des échantillons. L’absence des Echinodermes a été observée dans de nombreuses stations. Seulement 11 espèces ont pu être identifiées dans cette zone d’étude. L’analyse faunistique et granulométrique nous a offert des données intéressantes concernant la relation existante entre les Echinodermes et la texture sédimentaires d’une part et met en évidence les espèces principales et les principaux stocks écologiques dominants d’autre part. Mots clés : Echinodermes - Etude bionomique - Analyse granulométrique - Golfe d’Oran.
Abstract
The distribution of Echinodermata on the funds of the Oran coast was the subject of a bionomic study which lies within the scope of a program of monitoring of this coastal environment subjected to strong anthropic actions. Around fifty stations were sampled covering the whole of the gulf of Oran. The stations are distributed according to the bathymetry of – 30 m to – 110 m. Two blows of Aberdeen bucket by station are carried out for the test sample selection. The absence of Echinodermata was observed in many stations. Only 11 species could be identified in this area of study. The faunistic and granulometric analysis offered to us interesting data concerning the existing relation between sedimentary Echinodermata and texture on the one hand and highlights the principal species and principal dominant ecological stocks on the other hand. Key words: Echinodermata - bionomic Study - granulometric Analysis - Gulf of Oran.
Dix Septièmes Journées Tunisiennes des Sciences de la Mer à Kerkennah (Tunisie) du 18 au 21 déceembre , 2017
Les parasites de poissons d’eaux profondes sont des indicateurs de la biodiversité dans ces écosy... more Les parasites de poissons d’eaux profondes sont des indicateurs de la biodiversité dans ces écosystèmes souvent inaccessibles par d’autres moyens( Klimpel et al., 2010). Micromesistius poutassou abriterait 22 espèces appartenant à six différents groupes zoologique (Valero et al.,2000; Fernandez et al., 2005) Ce travail, est un inventaire des parasites du merlan bleu de la côte oranaise, avec leur identification au plus bas niveau taxonomique possible.
Congrès International "Estuaires et Aires Marines Côtières Protégées, (ECPA 2014), Izmir-Turquie du 04 au 06 Novembre., 2014
RÉSUMÉ : Le milieu marin de la rive sud-méditerranéenne accuse un retard en matière de maintien e... more RÉSUMÉ : Le milieu marin de la rive sud-méditerranéenne accuse un retard en matière de maintien et de protection de la biodiversité par rapport au domaine continental. Les surfaces réservées aux aires marines protégées sont limitées, et les niveaux de protection sont dérisoires. Devant l’ampleur de la dégradation des écosystèmes marins affectant l’ensemble des pays riverains de la Méditerranée dont l’Algérie, la nécessité de sauvegarder les espaces littoraux et insulaires d’intérêt écologique majeur n’est plus à démontrer. La présente étude menée au niveau de l’île de Rechgoun s’inscrit dans ce cadre visant à caractériser l’habitat, d’évaluer ses potentialités écobiologiques renfermant des espèces végétales et animales remarquables par leur endémisme, leur rareté, et leur vulnérabilité, et disposant d’un statut national voire régional, mais subissant de fortes pressions anthropiques qui indiquent avec force la nécessité et l’urgence d’enclencher des mesures de protection du site insulaire en question. L’île de Rechgoun répond parfaitement à l’ensemble des critères de sélection des aires marines protégées, reconnus et admis par les instances régionales, voire internationales auquel s’ajoute la ressemblance des niches écologiques avec un site similaire déjà classé en l’occurrence les îles Habibas au nord-est d’Oran. Tout ceci renforcera le nombre d’espaces protégés exclusivement marins en Algérie, et par voie de conséquence, le réseau des aires marines protégées dans la partie sud de la Méditerranée avec comme incidences majeures, le maintien d’un pôle de biodiversité, et la reconstitution des stocks halieutiques à forte valeur marchande. MOTS CLÉS : Ile Rechgoun, Aire marine protégée, Espaces insulaires, Biodiversité, Endémisme, vulnérabilité. Méditerranée, Algérie.
ABSTRACT: The marine environment in the Mediterranean shows a delay maintenance protection of the biodiversity compared to continental field. The surfaces reserved for marine protected areas are weak, and the levels of protection are ridiculous. In front of the extent of the erosion of the marine ecosystems affecting the whole of the countries on the Mediterranean who’s Algeria, the need for safeguarding littoral and insular spaces of major ecological interest is not any more to show. The presents study led to the level of the Rechgoun island lies within this scope sant to characterize the habitat, to evaluate its ecobiological potentialities containing of the vegetable and animal species remarkable by their endemism, their scarcity, and their vulnerability, and having an even regional national statute, but undergoing strong anthropic pressures which indicate with force the need and the urgency to engage protection measures of the insular site in question. The Rechgoun island answers perfectly the whole of the marine criteria of selection of marine protected areas, recognized and admitted by the regional authorities, even international to which the resemblance of the ecological niches is added to a similar site already classified in fact the Habibas islands to north east of Oran. All this will reinforce the number of exclusively marine spaces protected in Algeria, and consequently, the network of marine protected areas in the southern part of the Mediterranean with like incidences major, the constitution, the maintenance of a pole of biodiversity, and the reconstitution of halieutics stocks to strong commercial value. KEY WORDS: Rechgoun Island, Marine protected areas, Insular spaces, Biodiversity, Endemism, Vulnerability. Mediterranean, Algeria.
5ème édition du Congrès International des Populations et des Communautés Animales (ICAPC 5), du 3 au 5 Novembre 2017 à Tamanrasset, Algérie., 2017
Les fonds côtiers de l’Ouest algérien n’ont fait l’objet que de très peu de travaux bionomiques. ... more Les fonds côtiers de l’Ouest algérien n’ont fait l’objet que de très peu de travaux bionomiques. Elles sont en général rares, fragmentaires et s’intéressent, pour la plupart des cas, à l’étude d’une seule espèce benthique. De nombreuses campagnes de prospection sont menées par de nombreux scientifiques, afin d’inventorier les organismes benthiques du plateau continental de l’Ouest algérien. Le présent bilan constitue un état des lieux et des connaissances sur les macro-invertébrés du littoral ouest algérien. Les informations recueillies peuvent être structurées dans une base de données à partir de laquelle il deviendra possible d’entreprendre un suivi régulier de cette faune benthique. Ces travaux peuvent être poursuivie et complétée par une étude de la dynamique des populations et des peuplements, des fluctuations saisonnières des paramètres physico-chimiques du milieu, afin d'évaluer la capacité de réaction de la vie benthique à de possibles perturbations. Cet inventaire d’intérêt écologique constitue une base de données comprenant des fiches de description et des cartes de distribution de la macrofaune, d’une grande utilité aux gestionnaires et acteurs de l’environnement côtier. Mots clés : Campagne bionomique - Fonds côtiers – Espèce benthique - Zones côtières – Plateau continental - Ouest algérien.
Abstract
The coastal funds of the west Algerian were the object only very few bionomic work. They are in general rare, fragmentary and are interested, for the majority of the cases, with the study of only one benthic species. Many prospection campaigns are carried out by many scientists, in order to inventory the benthic organisms of the continental shelf of the west Algerian coast. This assessment constitutes an inventory of fixtures and knowledge on the macro-invertebrates of the west Algerian coast. Information collected can be structured in a data base from which it will become possible to undertake a regular follow-up of this benthic fauna. This work can be continued and supplemented by a study of the dynamics of the populations, seasonal fluctuations of the physicochemical parameters of the biotope, in order to evaluate the capacity of reaction of the benthic life to possible disturbances. This inventory constitutes a data base including the cards of description and the distribution of the macrofauna, of a great utility to the managers and actors of the coastal environment. Key words: Bionomic Campaign - Coastal Funds – Benthic species - Coastal zones – Continental shelf – West Algerian.
Le dessalement de l'eau (également appelé dessalage ou désalinisation) est un processus qui perme... more Le dessalement de l'eau (également appelé dessalage ou désalinisation) est un processus qui permet d'obtenir de l'eau douce (potable) à partir d'une eau saumâtre ou salée (eau de mer notamment). La technique du dessalement d'eau de mer représente une ressource alternative qui apporte des réponses aux besoins en eau à court et à long terme. Le dessalement d’eau s’impose progressivement comme la solution de premier plan pour faire face au stress hydrique croissant, c’est-à-dire au déséquilibre entre la demande en eau et la quantité disponible. Le problème de l’eau potable se posant de façon aiguë sur notre planète, et particulièrement dans notre pays, ce qui a engendré le développement des techniques de dessalement d’eau de mer qui soient économiques, plus fiables et protectrice de l’environnement. L’Etat algérien en a fait une priorité, en particulier pour la région de l’Ouest algérien, qui souffre depuis plusieurs décennies d’un dramatique déficit en eau potable.
Une zone humide, dénomination dérivant du terme anglais « wetland », est une région où le princip... more Une zone humide, dénomination dérivant du terme anglais « wetland », est une région où le principal facteur d'influence du biotope et de sa biocénose est l'eau. Les différents types de zones humides sont aussi nombreux que variés, qu'elles soient continentales ou côtières, naturelles ou artificielles, d'eaux douces, saumâtres ou salées. Les zones humides naturelles
Nématodes parasites de poissons marins de la côte ouest algérienne Cas des poissons Gadidés Ce do... more Nématodes parasites de poissons marins de la côte ouest algérienne Cas des poissons Gadidés Ce document présente une investigation helminthologique de deux poissons Gadidés congénères : la Mostelle de fond Phycis blennoides (Brûnnich, 1768) e t l a Mostelle de roche Phycis phycis (Linné, 1758), portant sur plusieurs sites de l a côte ouest algérienne. Celle-ci a permis d'identifier neufs espèces d e Nématodes parasites dont : Des stades l arvai res d ' Hysterothylacium f abri , Hysterothylacium s p , Anisakis simplex et Anisakis physeteris, exception faite d'Hysterothylacium sp, tous les autres Nématodes sont communs chez les deux poisons hôtes. Des stades adultes de Cucullanus cirratus, Hysterothylacium aduncum et Capillaria gracilis, ont également été rencontrés chez les deux espèces de Mostelles. Philometra globiceps au stade adulte n'a été cependant rencontrée que chez Phycis phycis, ainsi de même pour Ascarophis collaris qui se montre spécifique à Phycis blennoides. La présence de certains Nématodes tels Hysterothylacium s p , Anisakis simplex,Anisakis physeteris, Cucullanus cirratus, Capillaria gracilis, Ascarophis collaris et de Philometra globiceps e s t signalée po u r la première sur la côte ouest algérienne.
La crevette rose du large Parapenaeus longirostris (Lucas 1846), est l’une des espèces de Crustac... more La crevette rose du large Parapenaeus longirostris (Lucas 1846), est l’une des espèces de Crustacés Décapodes ciblées par les pêcheries démersales côtières et hauturières en Méditerranée occidentale en général, et sur la côte ouest algérienne en particulier. Cet ouvrage constitue un premier aperçu sur le régime alimentaire de la crevette rose Parapenaeus longirostris de l’Ouest algérien. Elle représente une part importante dans les débarquements au niveau de nombreux ports de pêche algériens. L’objectif permet de combler les lacunes sur l’éco- biologie de cette espèce en général, et sur son régime alimentaire en particulier.
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Papers by Ahmed Kerfouf
contaminations of Cu, Cd, Pb, Zn, and Ni in the organs of Holothuria
tubulosa (Gmelin, 1791), at two sites on the Algerian west coast; Ain
Franine (AF) and Sidi Lakhdar (SL). The obtained concentrations revealed the presence of heterogeneous metal contents and showed that the most important concentrations were relatively detected in zinc, with values of the male gonads at the level of AF (16.39 ± 2.38 mg / kg PF) for winter and SL (4.65 ± 0.59mg / kg PF) for summer. The lowest zinc values were recorded on the integument for the two sites. The highest Cu values were recorded in spring on the integument of two groups of Holothuria tubulosa. Nickel concentrations showed a high value in the integuments in males (1.08 ±0.03mg / kgP.F) at AF during summer and at SL in spring (0.93 ± 0.02mg / kg PF). While they recorded the lowest values in winter for sea cucumbers of FA and in spring for those of SL for the same organ. The lead concentrations revealed high values on the integument with (1.77 ± 0.56 mg / kg PF) in winter for SL sea cucumbers and (1.36 ± 0.04 mg / kg PF) in summer for those from AF. Moreover, cadmium targeted the same organ as lead where high values were noticed on the integuments during fall for the two communities of sea cucumbers of the order of (0.51 ± 0.03 mg / kg PF)
to AF and from (0.43 ± 0.01mg / kg PF) to SL. The analysis of the metal
concentrations obtained revealed that, despite the difference in biotope, the two communities of Holothuria tubulosa did not present a significant
difference (P> 0.005) for all the metals considered.
Bouhamdane dam, Seybouse watershed, north-eastern Algeria. We carried out a bi-monthly sampling of macroinvertebrates and nine water physicochemical parameters from September 2017 to July
2018 at three sites. Results show that the collected macroinvertebrates (6756 individuals) belong to 15 families and 12 orders. The abundance of the macrofauna consisted of 88.19% crustaceans,
7.74% insects, 3.7% molluscs and 0.16% annelids. Physicochemical analyzes (depth, turbidity, pH, dissolved O2, temperature, salinity, and conductivity) showed variability among sites. The families
of Gammaridae and Baetidae were the most frequent and the most abundant on all the stations. The results indicate that aquatic macroinvertebrates constitute good indicators of the biological quality of water. This study shows that even with the occurrence of regular dam water discharge, the macroinvertebrate community is still able to persist either through adaptation to high water velocity or high colonization rate.
Keywords: Parasites; Pagellus acarne; Sparidae; Western Algeria; Mediterranean.
contaminations of Cu, Cd, Pb, Zn, and Ni in the organs of Holothuria
tubulosa (Gmelin, 1791), at two sites on the Algerian west coast; Ain
Franine (AF) and Sidi Lakhdar (SL). The obtained concentrations revealed the presence of heterogeneous metal contents and showed that the most important concentrations were relatively detected in zinc, with values of the male gonads at the level of AF (16.39 ± 2.38 mg / kg PF) for winter and SL (4.65 ± 0.59mg / kg PF) for summer. The lowest zinc values were recorded on the integument for the two sites. The highest Cu values were recorded in spring on the integument of two groups of Holothuria tubulosa. Nickel concentrations showed a high value in the integuments in males (1.08 ±0.03mg / kgP.F) at AF during summer and at SL in spring (0.93 ± 0.02mg / kg PF). While they recorded the lowest values in winter for sea cucumbers of FA and in spring for those of SL for the same organ. The lead concentrations revealed high values on the integument with (1.77 ± 0.56 mg / kg PF) in winter for SL sea cucumbers and (1.36 ± 0.04 mg / kg PF) in summer for those from AF. Moreover, cadmium targeted the same organ as lead where high values were noticed on the integuments during fall for the two communities of sea cucumbers of the order of (0.51 ± 0.03 mg / kg PF)
to AF and from (0.43 ± 0.01mg / kg PF) to SL. The analysis of the metal
concentrations obtained revealed that, despite the difference in biotope, the two communities of Holothuria tubulosa did not present a significant
difference (P> 0.005) for all the metals considered.
Bouhamdane dam, Seybouse watershed, north-eastern Algeria. We carried out a bi-monthly sampling of macroinvertebrates and nine water physicochemical parameters from September 2017 to July
2018 at three sites. Results show that the collected macroinvertebrates (6756 individuals) belong to 15 families and 12 orders. The abundance of the macrofauna consisted of 88.19% crustaceans,
7.74% insects, 3.7% molluscs and 0.16% annelids. Physicochemical analyzes (depth, turbidity, pH, dissolved O2, temperature, salinity, and conductivity) showed variability among sites. The families
of Gammaridae and Baetidae were the most frequent and the most abundant on all the stations. The results indicate that aquatic macroinvertebrates constitute good indicators of the biological quality of water. This study shows that even with the occurrence of regular dam water discharge, the macroinvertebrate community is still able to persist either through adaptation to high water velocity or high colonization rate.
Keywords: Parasites; Pagellus acarne; Sparidae; Western Algeria; Mediterranean.
The present study on the island of Rachgoun has made it possible to characterize the marine habitat, to evaluate its ecobiological potential containing plant and animal species remarkable for their endemism, their rarity, and their vulnerability, but undergoing strong anthropogenic pressures which strongly indicate the need and urgency to initiate protection measures. Human interventions have degraded the ecological and physical integrity of the island and its fragile ecosystem. The Rachgoun island answers perfectly the whole of the marine criteria of selection of Marine Protected Areas (MPA), recognized and admitted by the regional authorities.
les types d'habitats prioritaires pour la conservation de la biodiversité dans les zones côtières, et de comprendre la place des macroinvertébrés dans le fonctionnement des ressources biologiques, pour identifier ses valeurs écologiques et les perturbations causées par les activités anthropiques. Les résultats obtenus ont permis d'estimer la diversité des invertébrés macrobenthiques et de caractériser les principales communautés.
Results of stomach content analyzes showed a wide range of benthic and endobenthic species. Crustacea are the preferred prey (F=77.69%), followed by Foraminifera, Annelida Polychaeta, and Mollusca with respective frequencies of (77.22%, 58.50% and 52.73%). Radiolaria, Porifera and Echinodermata represent a less important part in the diet of this species and constitute accidental prey, whose frequency is less than 10%. Benthic organisms with silt ingest the plant and various debris, which are the secondary prey with an average frequency of 14.81%. Results show that the shrimps nourish themselves intensively in spring and more in less in winter and summer, which corresponds to a significant food activity, for the constitution of concerning the reproduction.
Pour rappel, un traité mondial a été signé le 2 février 1971 à Ramsar (Iran) pour la conservation et l'utilisation rationnelle et durables des zones humides. 169 pays à travers le monde dont l'Algérie en 1982, ont ratifié ce traité qui constitue l'un des principaux fondements de la conservation des zones humides.
La convention de Ramsar considère que la biodiversité est un point capital pour qu'une zone humide soit considérée d'importance internationale. Les zones humides représentent seulement 1% de la superficie mondiale. Cependant, on y trouve 40% des espèces vivantes.
En dépit de tous les services qu’elles rendent à l’humanité, les zones humides figurent au premier plan des victimes expiatoires de la biodiversité. Dans de nombreuses régions de la Méditerranée, les zones humides ont été asséchées et transformées à des fins agricoles ou urbaines, ou suite à des politiques visant à améliorer les conditions sanitaires par l’élimination de foyers de maladies comme le paludisme.
Depuis la ratification de cette convention par l'Algérie, de nombreuses activités ont été menées, pour une meilleure gestion de ces sites et leur valorisation à travers des plans de gestion, des inventaires ainsi qu'un suivi permanant de leur dynamique écologique. L’Algérie avec une superficie classée près de 3 millions d’hectares, est le troisième pays en Afrique, après le Botswana et son fameux Delta de l’Okavango qui fait 6.8 millions d’hectares et la Tanzanie avec 3.5 millions d’hectares, et la huitième dans le monde après le Canada (13 millions ha), la Russie (10,3 millions ha), l’Australie (5.2 millions ha), le Brésil (4,5 millions), le Pérou (2,9 millions) et les Etats-Unis (DGF, 2004).
Le contexte actuel de la région ouest algérienne, notamment les conditions écologiques et environnementales, est tel que les zones humides de la région se trouvent dangereusement affectées. Il s’avère, par conséquent, nécessaire de mettre en place un Plan de Gestion Durable de ces écosystèmes fragilisés par les aléas climatiques et par les actions anthropiques.
C’est dans ce contexte que s’inscrit notre communication, dont l’objectif est donc de dresser l’état des lieux des zones humides de l’Ouest algérien, afin de servir de base, lors de l’élaboration des différents plans régionaux de Gestion des Ressources Naturelles des zones humides.
La flore algale répond parfaitement aux variations de l’environnement biotique et abiotique et représente ainsi un indicateur sensible de ses changements.
L’objectif de notre étude, est d’évaluer les caractéristiques et la répartition actuelle de la flore algale des zones humides côtières de l’Ouest algérien et de définir les conditions de leur répartition. À plus long terme, cette étude apportera une meilleure connaissance des préférences écologiques de ces organismes et de leur abondance, et permettra de mieux évaluer le stress environnemental de la côte oranaise.
Mots-clés: Flore algale, distribution spécifique, distribution spatiale, biosurveillance, stress environnemental, zones humides, Ouest algérien.
oranaises a connu une importante expansion pendant la dernière décennie.
En effet, un inquiétant volume d'eaux usées se jette annuellement sur le littoral oranais. Ceci éclaircit l’importance, le sérieux et la gravité
de ce problème sur l’ensemble de l'écosystème marin et les stocks
halieutiques.
Une cinquantaine stations ont été échantillonnées couvrant l’ensemble du golfe d’Oran. Les stations se répartissent selon la bathymétrie de – 30 m à – 110 m. Deux coups de benne Aberdeen par station sont effectués pour le prélèvement des échantillons.
L’absence des Echinodermes a été observée dans de nombreuses stations. Seulement 11 espèces ont pu être identifiées dans cette zone d’étude. L’analyse faunistique et granulométrique nous a offert des données intéressantes concernant la relation existante entre les Echinodermes et la texture sédimentaires d’une part et met en évidence les espèces principales et les principaux stocks écologiques dominants d’autre part.
Mots clés : Echinodermes - Etude bionomique - Analyse granulométrique - Golfe d’Oran.
Abstract
The distribution of Echinodermata on the funds of the Oran coast was the subject of a bionomic study which lies within the scope of a program of monitoring of this coastal environment subjected to strong anthropic actions.
Around fifty stations were sampled covering the whole of the gulf of Oran. The stations are distributed according to the bathymetry of – 30 m to – 110 m. Two blows of Aberdeen bucket by station are carried out for the test sample selection.
The absence of Echinodermata was observed in many stations. Only 11 species could be identified in this area of study. The faunistic and granulometric analysis offered to us interesting data concerning the existing relation between sedimentary Echinodermata and texture on the one hand and highlights the principal species and principal dominant ecological stocks on the other hand.
Key words: Echinodermata - bionomic Study - granulometric Analysis - Gulf of Oran.
MOTS CLÉS : Ile Rechgoun, Aire marine protégée, Espaces insulaires, Biodiversité, Endémisme, vulnérabilité. Méditerranée, Algérie.
ABSTRACT: The marine environment in the Mediterranean shows a delay maintenance protection of the biodiversity compared to continental field. The surfaces reserved for marine protected areas are weak, and the levels of protection are ridiculous. In front of the extent of the erosion of the marine ecosystems affecting the whole of the countries on the Mediterranean who’s Algeria, the need for safeguarding littoral and insular spaces of major ecological interest is not any more to show. The presents study led to the level of the Rechgoun island lies within this scope sant to characterize the habitat, to evaluate its ecobiological potentialities containing of the vegetable and animal species remarkable by their endemism, their scarcity, and their vulnerability, and having an even regional national statute, but undergoing strong anthropic pressures which indicate with force the need and the urgency to engage protection measures of the insular site in question. The Rechgoun island answers perfectly the whole of the marine criteria of selection of marine protected areas, recognized and admitted by the regional authorities, even international to which the resemblance of the ecological niches is added to a similar site already classified in fact the Habibas islands to north east of Oran. All this will reinforce the number of exclusively marine spaces protected in Algeria, and consequently, the network of marine protected areas in the southern part of the Mediterranean with like incidences major, the constitution, the maintenance of a pole of biodiversity, and the reconstitution of halieutics stocks to strong commercial value.
KEY WORDS: Rechgoun Island, Marine protected areas, Insular spaces, Biodiversity, Endemism, Vulnerability. Mediterranean, Algeria.
Le présent bilan constitue un état des lieux et des connaissances sur les macro-invertébrés du littoral ouest algérien. Les informations recueillies peuvent être structurées dans une base de données à partir de laquelle il deviendra possible d’entreprendre un suivi régulier de cette faune benthique. Ces travaux peuvent être poursuivie et complétée par une étude de la dynamique des populations et des peuplements, des fluctuations saisonnières des paramètres physico-chimiques du milieu, afin d'évaluer la capacité de réaction de la vie benthique à de possibles perturbations. Cet inventaire d’intérêt écologique constitue une base de données comprenant des fiches de description et des cartes de distribution de la macrofaune, d’une grande utilité aux gestionnaires et acteurs de l’environnement côtier.
Mots clés : Campagne bionomique - Fonds côtiers – Espèce benthique - Zones côtières – Plateau continental - Ouest algérien.
Abstract
The coastal funds of the west Algerian were the object only very few bionomic work. They are in general rare, fragmentary and are interested, for the majority of the cases, with the study of only one benthic species. Many prospection campaigns are carried out by many scientists, in order to inventory the benthic organisms of the continental shelf of the west Algerian coast.
This assessment constitutes an inventory of fixtures and knowledge on the macro-invertebrates of the west Algerian coast. Information collected can be structured in a data base from which it will become possible to undertake a regular follow-up of this benthic fauna. This work can be continued and supplemented by a study of the dynamics of the populations, seasonal fluctuations of the physicochemical parameters of the biotope, in order to evaluate the capacity of reaction of the benthic life to possible disturbances. This inventory constitutes a data base including the cards of description and the distribution of the macrofauna, of a great utility to the managers and actors of the coastal environment.
Key words: Bionomic Campaign - Coastal Funds – Benthic species - Coastal zones – Continental shelf – West Algerian.
Cet ouvrage constitue un premier aperçu sur le régime alimentaire de la crevette rose Parapenaeus longirostris de l’Ouest algérien. Elle représente une part importante dans les débarquements au niveau de nombreux ports de pêche algériens. L’objectif permet de combler les lacunes sur l’éco- biologie de cette espèce en général, et sur son régime alimentaire en particulier.