Based on a microfloristic analysis of periphyton, a selected ecological method of evaluating wate... more Based on a microfloristic analysis of periphyton, a selected ecological method of evaluating water quality, independent of saprobic systems is applied to a chosen section of running water in the springs of Levadia, Greece. The graphic representation of the results and an estimation of the degree of pollution is given. A simple method for the quantitative evaluation of the biocoenose
The subtidal epiphytic communities of both macroalgae and microalgae of the Aegean Sea have been ... more The subtidal epiphytic communities of both macroalgae and microalgae of the Aegean Sea have been inadequately investigated. In this paper epiphytic algal assemblages thriving on different hosts [i.e. the phaeophyte Padina pavonia (L.) LAMOUROUX, the chlorophyte Halimeda tuna (ELLIS et SOLANDER) LAMOUROUX and the seagrass Posidonia oceanica (L.) DELILE], were studied in a typical oligotrophic site of the Aegean Sea (Dikastika, Attica Peninsula) during the course of one year (June 1997-May 1998). A total of 47 taxa of epiphytic macroalgae were identified, with Hypnophyceae and Ephemerophyceae being the dominant life forms. The major algal groups (rhodophytes, phaeophytes, chlorophytes) showed a distinct seasonality, with rhodophytes predominating on all hosts. The majority of epiphytes favoured a certain position on the host thallus or blade. A distinct vertical zonation pattern was found, with epiphytes covering only certain host areas (upper-, middle-, lower parts of the plant), and further differentiated between the frond edge and blade's lamina. A total of 175 taxa of diatoms were identified and the diatom assemblages bear great resemblance to typical epiphytic floras, with dominant genera Mastogloia, Amphora, Nitzschia, Diploneis, Navicula and Cocconeis. Mass development of epiphytic diatoms on certain hosts implies host preference, but no host-specificity could be ascertained. The total epiphytic species composition seems to be affected by the seasonal alteration of abiotic factors. Epiphytic macroalgal species abundance and diversity was the highest during spring, having a possible competitive influence on the epiphytic diatom growth, whereas higher species abundance of diatoms during summer might furthermore be attributed to the surface increase of macroalgae.
Terrestrial algae consisting mainly of Cyanophyta, Chlorophyta, Bacillariophyta and Xanthophyta s... more Terrestrial algae consisting mainly of Cyanophyta, Chlorophyta, Bacillariophyta and Xanthophyta show a great capacity to withstand desiccation, dominating in the microbial flora of extreme dry biotopes such as hot and cold deserts, rocks and buildings (Bristol 1920; Bristol-Roach 1927; Petersen 1935; Cameron 1963; Gollerbakh, Shtina 1969; Fogg 1969; Fogg et al. 1973; Brock 1975; Friedmann, Ocampo 1976; Novichkova-Ivanova 1980; Friedmann 1980; Broady 1981a, 1981b; Potts, Friedmann 1981; Starks et al. 1981; Anagnostidis et al. 1982).
In the pursuit of sustainable sources for food, energy, and health products, microalgae have gain... more In the pursuit of sustainable sources for food, energy, and health products, microalgae have gained attention. In the present study, the lagoonal system of the Nestos River delta was selected as a sampling point in order to search for opportunistic and robust species. Two new strains of Tetraselmis are described with regards to their taxonomic features (as observed using light and transmission electron microscopy and molecular phylogenetics) and their biochemical properties (total lipid, total protein, and total carbohydrate content, photosynthetic pigments, and antioxidant capacity). The studied strains were identified as representatives of Tetraselmis verrucosa f. rubens. Furthermore, both strains exhibited an interesting biochemical profile coupled with high growth rates and promising antioxidant activity, without the use of enhancement and induction culture methods, warranting further investigation and showing potential for biotechnological use.
Dinoflagellates contain large amounts of omega-3 fatty acids, including the nutritionally importa... more Dinoflagellates contain large amounts of omega-3 fatty acids, including the nutritionally important docosahexaenoic acid (DHA). However, their cultivation in suspensions is characterized by low growth rates. Twin-layer porous substrate photobioreactors (TL-PSBRs) have been shown to support growth of different microalgal species, including the robust dinoflagellate Symbiodinium voratum. In the present study, the potential of cultivating marine autotrophic dinoflagellate species in a TL-PSBR for DHA production was explored. Based on initial screening experiments, two Symbiodinium species with high biomass and DHA productivities were selected: the symbiotic Symbiodinium microadriaticum CCAC 2475 B and the free-living Symbiodinium voratum CCAC 3869 B. The effects of three different temperatures (17, 22 and 27 °C) and nitrogen regimes (nitrate, ammonium and nitrogen-free) on biomass growth, total lipid accumulation and fatty acid methyl esters (FAMEs) content, with emphasis on DHA, were ...
The morphological variability of the geniculate coralline algae Amphiroa beauvoisii, A. rigida, C... more The morphological variability of the geniculate coralline algae Amphiroa beauvoisii, A. rigida, Corallina elongata, C. officinalis, Jania adhaerens and J. rubens from the gulfs of Evoikos, Korinthiakos and Saronikos (Greece) was investigated. External microscopic characters as seen with the scanning electron microscope (SEM) are illustrated: in particular, the organization of intergenicular surfaces; differentiation and superficial aspects of conceptacles (when available); and quantitative characters such as epithallial concavity diameter and variation in the thickness of calcification were examined
Internationale Revue der gesamten Hydrobiologie und Hydrographie, 1988
The ultrastructure of Valvata piscinalis O. F. MULLER, a mollusc collected from Lake Trichonis, G... more The ultrastructure of Valvata piscinalis O. F. MULLER, a mollusc collected from Lake Trichonis, Greece, is illustrated by SEM and compared with Polish specimens. The specific features observed are leading to the characterization of the specimens as an ecotype. The epizoic algal growths, ascertained by direct examination or scraped from shells of V. piscinalis, are commented.
Siliceous Deposits of the Tethys and Pacific Regions, 1989
Silica diagenesis in a diatomaceous section of marly limestone and chert from central Zakynthos I... more Silica diagenesis in a diatomaceous section of marly limestone and chert from central Zakynthos Island, Ionian sea, was investigated. This section, underlain by Cretaceous-Eocene reefal limestone and overlain by a middle-upper Miocene terrigenous—evaporitic succession, is defined as the Romiri Formation. Diatom and planktonic foraminiferal assemblages occur, the latter determining the biostratigraphic interval N4-N7 of the Blow zonation (Aquitanian-Burdigalian).
Based on a microfloristic analysis of periphyton, a selected ecological method of evaluating wate... more Based on a microfloristic analysis of periphyton, a selected ecological method of evaluating water quality, independent of saprobic systems is applied to a chosen section of running water in the springs of Levadia, Greece. The graphic representation of the results and an estimation of the degree of pollution is given. A simple method for the quantitative evaluation of the biocoenose
The subtidal epiphytic communities of both macroalgae and microalgae of the Aegean Sea have been ... more The subtidal epiphytic communities of both macroalgae and microalgae of the Aegean Sea have been inadequately investigated. In this paper epiphytic algal assemblages thriving on different hosts [i.e. the phaeophyte Padina pavonia (L.) LAMOUROUX, the chlorophyte Halimeda tuna (ELLIS et SOLANDER) LAMOUROUX and the seagrass Posidonia oceanica (L.) DELILE], were studied in a typical oligotrophic site of the Aegean Sea (Dikastika, Attica Peninsula) during the course of one year (June 1997-May 1998). A total of 47 taxa of epiphytic macroalgae were identified, with Hypnophyceae and Ephemerophyceae being the dominant life forms. The major algal groups (rhodophytes, phaeophytes, chlorophytes) showed a distinct seasonality, with rhodophytes predominating on all hosts. The majority of epiphytes favoured a certain position on the host thallus or blade. A distinct vertical zonation pattern was found, with epiphytes covering only certain host areas (upper-, middle-, lower parts of the plant), and further differentiated between the frond edge and blade's lamina. A total of 175 taxa of diatoms were identified and the diatom assemblages bear great resemblance to typical epiphytic floras, with dominant genera Mastogloia, Amphora, Nitzschia, Diploneis, Navicula and Cocconeis. Mass development of epiphytic diatoms on certain hosts implies host preference, but no host-specificity could be ascertained. The total epiphytic species composition seems to be affected by the seasonal alteration of abiotic factors. Epiphytic macroalgal species abundance and diversity was the highest during spring, having a possible competitive influence on the epiphytic diatom growth, whereas higher species abundance of diatoms during summer might furthermore be attributed to the surface increase of macroalgae.
Terrestrial algae consisting mainly of Cyanophyta, Chlorophyta, Bacillariophyta and Xanthophyta s... more Terrestrial algae consisting mainly of Cyanophyta, Chlorophyta, Bacillariophyta and Xanthophyta show a great capacity to withstand desiccation, dominating in the microbial flora of extreme dry biotopes such as hot and cold deserts, rocks and buildings (Bristol 1920; Bristol-Roach 1927; Petersen 1935; Cameron 1963; Gollerbakh, Shtina 1969; Fogg 1969; Fogg et al. 1973; Brock 1975; Friedmann, Ocampo 1976; Novichkova-Ivanova 1980; Friedmann 1980; Broady 1981a, 1981b; Potts, Friedmann 1981; Starks et al. 1981; Anagnostidis et al. 1982).
In the pursuit of sustainable sources for food, energy, and health products, microalgae have gain... more In the pursuit of sustainable sources for food, energy, and health products, microalgae have gained attention. In the present study, the lagoonal system of the Nestos River delta was selected as a sampling point in order to search for opportunistic and robust species. Two new strains of Tetraselmis are described with regards to their taxonomic features (as observed using light and transmission electron microscopy and molecular phylogenetics) and their biochemical properties (total lipid, total protein, and total carbohydrate content, photosynthetic pigments, and antioxidant capacity). The studied strains were identified as representatives of Tetraselmis verrucosa f. rubens. Furthermore, both strains exhibited an interesting biochemical profile coupled with high growth rates and promising antioxidant activity, without the use of enhancement and induction culture methods, warranting further investigation and showing potential for biotechnological use.
Dinoflagellates contain large amounts of omega-3 fatty acids, including the nutritionally importa... more Dinoflagellates contain large amounts of omega-3 fatty acids, including the nutritionally important docosahexaenoic acid (DHA). However, their cultivation in suspensions is characterized by low growth rates. Twin-layer porous substrate photobioreactors (TL-PSBRs) have been shown to support growth of different microalgal species, including the robust dinoflagellate Symbiodinium voratum. In the present study, the potential of cultivating marine autotrophic dinoflagellate species in a TL-PSBR for DHA production was explored. Based on initial screening experiments, two Symbiodinium species with high biomass and DHA productivities were selected: the symbiotic Symbiodinium microadriaticum CCAC 2475 B and the free-living Symbiodinium voratum CCAC 3869 B. The effects of three different temperatures (17, 22 and 27 °C) and nitrogen regimes (nitrate, ammonium and nitrogen-free) on biomass growth, total lipid accumulation and fatty acid methyl esters (FAMEs) content, with emphasis on DHA, were ...
The morphological variability of the geniculate coralline algae Amphiroa beauvoisii, A. rigida, C... more The morphological variability of the geniculate coralline algae Amphiroa beauvoisii, A. rigida, Corallina elongata, C. officinalis, Jania adhaerens and J. rubens from the gulfs of Evoikos, Korinthiakos and Saronikos (Greece) was investigated. External microscopic characters as seen with the scanning electron microscope (SEM) are illustrated: in particular, the organization of intergenicular surfaces; differentiation and superficial aspects of conceptacles (when available); and quantitative characters such as epithallial concavity diameter and variation in the thickness of calcification were examined
Internationale Revue der gesamten Hydrobiologie und Hydrographie, 1988
The ultrastructure of Valvata piscinalis O. F. MULLER, a mollusc collected from Lake Trichonis, G... more The ultrastructure of Valvata piscinalis O. F. MULLER, a mollusc collected from Lake Trichonis, Greece, is illustrated by SEM and compared with Polish specimens. The specific features observed are leading to the characterization of the specimens as an ecotype. The epizoic algal growths, ascertained by direct examination or scraped from shells of V. piscinalis, are commented.
Siliceous Deposits of the Tethys and Pacific Regions, 1989
Silica diagenesis in a diatomaceous section of marly limestone and chert from central Zakynthos I... more Silica diagenesis in a diatomaceous section of marly limestone and chert from central Zakynthos Island, Ionian sea, was investigated. This section, underlain by Cretaceous-Eocene reefal limestone and overlain by a middle-upper Miocene terrigenous—evaporitic succession, is defined as the Romiri Formation. Diatom and planktonic foraminiferal assemblages occur, the latter determining the biostratigraphic interval N4-N7 of the Blow zonation (Aquitanian-Burdigalian).
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