Argentina is one of the countries that exports animals for equestrian sports. This paper analyzes the environmental effects of sport horse production farms in Argentina and proposes actions to minimize the environmental effects of this... more
Argentina is one of the countries that exports animals for equestrian sports. This paper analyzes the environmental effects of sport horse production farms in Argentina and proposes actions to minimize the environmental effects of this type of production. Twenty-six sport horse production farms in the province of Buenos Aires were studied. The proximity of the farms to a surface water body, the destination of the stall bedding, management practices and whether they receive veterinary advice were the characteristics analyzed in relation to feed, its composition and water consumption according to the performance of the animals. A nominal qualitative analysis on the impact was carried out considering three impact categories: low, medium and high. The association between the four environmental variables analyzed has shown that only two farms have a low environmental impact, while eighteen farms have a medium impact and five farms have a high impact. The results show that the role of the...
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Sturgeon (Acipenser baerii and A. gueldenstaedtii) specimens, native to the northern hemisphere, were reported in different environments of the La Plata Basin (South America). The objectives of this study were to provide the first... more
Sturgeon (Acipenser baerii and A. gueldenstaedtii) specimens, native to the northern hemisphere, were reported in different environments of the La Plata Basin (South America). The objectives of this study were to provide the first insights into the natal origin and habitat use of these sturgeon species in the La Plata Basin through geochemical analysis (87Sr/86Sr) of fin spines and to review historical catch reports. Spine core‐to‐edge 87Sr/86Sr ratios were measured by LA‐MC‐ICPMS. A Quadratic Discriminant Analysis model based on water 87Sr/86Sr baseline of the La Plata Basin was run to infer the natal origin. The isotopic profiles indicate a common origin, compatible with the location of the fish farms in the Uruguay Basin. The A. baerii isotopic time series suggested that the fish moved towards the Paraná Basin months before capture, while A. gueldenstaedtii would have survived a longer time (perhaps years). Seventeen reports of sturgeons were recorded and preserved in museum coll...
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espanolLos otolitos de los peces son complejos policristalinos, compuestos principalmente por carbonato de calcio. El lapillus suele ser el otolito mas conspicuo de los peces siluriformes. Los estudios de los otolitos de los siluriformes... more
espanolLos otolitos de los peces son complejos policristalinos, compuestos principalmente por carbonato de calcio. El lapillus suele ser el otolito mas conspicuo de los peces siluriformes. Los estudios de los otolitos de los siluriformes son escasos a nivel mundial. En este articulo se estudian los lapilli de Ageneiosus inermis, Auchenipterus nuchalis, Callichthys callichthys, Corydoras paleatus, Pterodoras granulosus, Rhinodoras dorbignyi, Pimelodella gracilis, Pimelodella laticeps, Rhamdia quelen, Hypostomus commersoni, Loricariichthys anus, Paraloricaria vetula, Iheringichthys labrosus, Luciopimelodus pati, Parapimelodus valenciennis, Pimelodus albicans, Pimelodus argenteus, Pimelodus maculatus and Sorubim lima. La talla estandar del pez se registro en milimetros. Los otolitos se extrajeron, describieron y fotografiaron, y se realizo una clave dicotomica. Los resultados mostraron que los otolitos lapilli de las especies estudiadas tienen una gran variabilidad morfologica; esto po...
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espanolEl Rio Uruguay integra junto con el Parana y el Paraguay la Cuenca del Plata; recorriendo aproximadamente unos 1700 Km desde su naciente en la Sierra do Mar (Brasil) hasta su desembocadura en el Rio de la Plata. En el trayecto... more
espanolEl Rio Uruguay integra junto con el Parana y el Paraguay la Cuenca del Plata; recorriendo aproximadamente unos 1700 Km desde su naciente en la Sierra do Mar (Brasil) hasta su desembocadura en el Rio de la Plata. En el trayecto correspondiente a su cuenca baja (desde la linea imaginaria Bella Union – Monte Caseros), sirve como limite internacional entre la Republica Argentina y la Republica Oriental del Uruguay, zona que es administrada por la Comision Administradora del Rio Uruguay (CARU). Sobre las margenes del Rio se encuentran asentamientos urbanos importantes como Concordia, Colon, Concepcion del Uruguay y Gualeguaychu de la margen Argentino y Salto, Paysandu y Fray Bentos de la margen Uruguaya; estos asentamientos presentan importantes desarrollos agricolas e industriales con descarga directa al rio. En este trabajo analizaremos la influencia de estas descargas sobre el Rio Uruguay en el periodo 1998-2004. EnglishUruguay river is 1800 km long and its basin covers an area...
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El objetivo de este trabajo es el estudio de la morfologia de la sagitta y el calculo de los parametros mwfometricos del otolito en relacion al crecimiento en longitud y peso del pez. Dichos parametros son necesarios en estudios de edad y... more
El objetivo de este trabajo es el estudio de la morfologia de la sagitta y el calculo de los parametros mwfometricos del otolito en relacion al crecimiento en longitud y peso del pez. Dichos parametros son necesarios en estudios de edad y crecimiento de Prionotns nudigula Ginsburg 1950. De cada uno de los de 354 ejemplares de Prionotus nudigula estudiados se registraron sexo, peso total (P) y talla (I,i), miditkdose asimismo la longitud maxima (LO) y la anchura maxima (AO) de las sagittae. Se analizaron las relaciones entre: P y Li; LO y Ll; AO y Li; LO y I: AO y I: AO y LO tanto para hembras y machos como sin disrriminacion entre sexos. Para el estudio de dichas relaciones se empleo el modelo de regresion con ajuste potencial. Las sagittae derecha e izquierda de un mismo individuo no presentaron d@rencias sigkjicatiuas, por tanto son morfometrica y morfologicamate iguakz Los otolitos de machos y hembras no presentaron diferencias en la topografia de las caras interna y externa, aun...
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The Atlantic Rainforest is among the main biodiversity hotspots in the world, the Yabotí Biosphere Reserve (YBR) being one of the most important remaining areas. Agriculture practices could lead to intensive usage of pesticides resulting... more
The Atlantic Rainforest is among the main biodiversity hotspots in the world, the Yabotí Biosphere Reserve (YBR) being one of the most important remaining areas. Agriculture practices could lead to intensive usage of pesticides resulting in a risk to the environment and human health. Water, suspended particulate matter (SPM), sediment, and fish (Andromakhe paris and Andromakhe saguazu) samples were collected from four streams with different degrees of protection of the YBR in two periods in order to assess the distribution of 18 organochlorine pesticides. Legacy and current-use pesticides were found in the different environmental matrices of the stream headwaters in non-anthropized areas within the buffer zone that drains the intangible area. A similar occurrence pattern of pesticides was found in all matrices. Levels of DDTs (<3.63 ng/L) and endosulfans (<21.8 ng/L) in surface water were above international guidelines for the protection of aquatic life in several streams for both sampling periods. HCHs, DDTs, endosulfans, and chlorpyrifos were detected in SPM and sediments from three streams, while γ-HCH (<60.3 ng/g lipid weight), chlorpyrifos (<698 ng/g lw), p,p´-DDD (<367 ng/g lw), and α-endosulfans (<209 ng/g lw) were detected in fish muscle in several streams. Chlorpyrifos and endosulfans were associated with current use, while DDx/DDT ratios suggested an old use. The concentration of pesticides found would not represent a risk to human health; however, it highlights the need to establish better regulation and action guidelines to reduce the anthropogenic effect on natural reserves.
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Abstract The whitemouth croaker Micropogonias furnieri is a demersal sciaenid fish widely distributed in Atlantic coasts and estuaries from Mexico to Argentina. In the South Atlantic (33°- 41 °S), there are two stocks: Rio de la Plata... more
Abstract The whitemouth croaker Micropogonias furnieri is a demersal sciaenid fish widely distributed in Atlantic coasts and estuaries from Mexico to Argentina. In the South Atlantic (33°- 41 °S), there are two stocks: Rio de la Plata (RDP) and El Rincon (ER), respectively. Studies based on genetic, age and size structure data suggested that RDP stock would be composed of two different populations, one estuarine-dependent (estuarine type) and the other with oceanic spawning sites (oceanic type). The hypothesis of segregation between the estuarine and oceanic types, and between these and the ER stock was tested by using the otolith chemistry in the edge (adult stage) and core (early stage) of fish. Li/Ca, Na/Ca, Mn/Ca, Cu/Ca, Ba/Ca, and Pb/Ca ratios were determined by LA-ICP-MS. Several ratios were significantly different between sampling sites for edge and core (p
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The white mullet Mugil curema supports several fisheries in the neotropical region; nevertheless, the population structure is still elusive. The aim of this study was to assess the presence of adult management units and nursery areas from... more
The white mullet Mugil curema supports several fisheries in the neotropical region; nevertheless, the population structure is still elusive. The aim of this study was to assess the presence of adult management units and nursery areas from five sampling sites throughout the Gulf of Mexico and northern Brazil using otolith microchemistry. The Li/Ca, Na/Ca, Mn/Ca, Sr/Ca, Ba/Ca and Pb/Ca ratios were measured in otolith core (juvenile stage) and edge (adult stage) (N = 131) using laser ablation–inductively coupled plasma–mass spectrometry. Several ratios were significantly different between sampling sites for core and edge (P < 0.05). For otolith edge, permutational multivariate analysis of variance showed significant differences (P < 0.05) between all sampling sites from Mexico (except between Mecoacán and Tamiahua, P > 0.05) and between Mexico (pooled samples) and Brazil. Quadratic discriminant analyses showed jackknifed classification higher in the edge (66.6% and 99.5% for M...
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The concentration of Ag, As, Cd, Cu, Cr, Hg, Ni, Pb, Se, U, V, and Zn was analyzed in water, sediment, and different organs of Prochilodus lineatus (muscle, liver and gill) in three most commercially important catch areas along La Plata... more
The concentration of Ag, As, Cd, Cu, Cr, Hg, Ni, Pb, Se, U, V, and Zn was analyzed in water, sediment, and different organs of Prochilodus lineatus (muscle, liver and gill) in three most commercially important catch areas along La Plata Basin, namely High Paraná River (HPR), Middle Paraná River (MPR) and Río de la Plata Estuary (RPE). The concentration of As, Cu and Zn (RPE) and Se (HPR) in water and As (RPE), Ni (HPR and MPR), Cu and Cr (all sites) in sediments exceeded the limits considered as hazardous for aquatic life. With the exception of Se (sediment-liver) and Pb (sediment-liver and sediment-gill), it was not observed a significant correlation between the element concentration in tissues and that found in water and sediment. No correlation was found between the size fish and element concentrations. Liver appeared to be the main storage tissue of trace elements and was classified as a macroconcentrator of Ag, Cu, Hg and Zn. Levels of trace elements in muscle of streaked prochilod were below recommended maximum levels established by national and international guidelines. According to Target Hazard Quotient (THQ), the consumption of muscle of P. lineatus from three sampling sites did not present toxicological risk for general and fishermen populations. Multivariate analyses suggest that the three groups studied remain with an important degree of geographical segregation, indicating that regulations should be revised according to the presence of contaminants in the different fishing areas.
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Research Interests: Zoology, Biology, Argentina, Ecology, Morphology, and 12 moreFourier Analysis, Atlantic Forest, Nature Conservation, Otolith, Fisheries Sciences, Genus, Ciencias Biológicas, Sympatric Speciation, Neotropical fish, Astyanax, Enseñanza - Aprendizaje Ciencias Naturales Y Exactas, and Environmental biology of fishes
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The anadromous catfish, Genidens barbus, is a commercial and vulnerable species from South America. The aims of the present study were to assess whether the nursery areas can be discriminated by using microchemical signatures of lapillus... more
The anadromous catfish, Genidens barbus, is a commercial and vulnerable species from South America. The aims of the present study were to assess whether the nursery areas can be discriminated by using microchemical signatures of lapillus otoliths, to assess the accuracy of classifying fish in relation to natal nursery area and to discuss the possibility of existence of homing behaviour. Thus, the otolith-core chemical signatures (barium (Ba):calcium (Ca), lithium (Li):Ca, magnesium (Mg):Ca, manganese (Mn):Ca, strontium (Sr):Ca, and zinc (Zn):Ca ratios) of adult fish were compared among different estuaries (De La Plata River in Argentina, and Patos Lagoon, Paranaguá Bay and Guanabara Bay in Brazil). PERMANOVA analysis showed significant differences in the multi-element signatures of the otolith core among sampling sites for all cohorts (2002, 2003, 2006 and 2007), indicating that the technique has considerable potential for use in future assessments of population connectivity and nur...
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The silverside Odontesthes bonariensis is a euryhaline species native of South America and represents a very important fishing resource for the Plata Basin (Argentina and Uruguay). This study compares the Sr:Ca ratio of water as well as... more
The silverside Odontesthes bonariensis is a euryhaline species native of South America and represents a very important fishing resource for the Plata Basin (Argentina and Uruguay). This study compares the Sr:Ca ratio of water as well as the Sr:Ca ratio and morphometry of the sagittal otolith of the silverside present in different environments (one salt lake, two freshwater dams, one lagoon, and one estuary) in order to evaluate the use of these variables as markers of habitat. The pattern of the Sr:Ca ratio in the water agrees with the one found in the otoliths, showing a positive relationship with the conductivity of the water. Univariate and multivariate analyses of variance indicated significant differences (P < 0.05) among the localities studied for the morphometric indices. The discriminant function analysis provided a high percentage of correctly classified individuals for the saltwater environment (100%) and the lentic water bodies and estuary (60–80%), circularity and for...
Research Interests: Biology, Morphometry, Habitat, Otolith, Ciencias Marinas, and 3 moreEstuary, Pesca, and Ciencias Agrícolas
The objective of this study was to identify potential recruitment sources of Prochilodus lineatus from freshwater areas (Paraná and Uruguay rivers) to estuarine population of the Río de la Plata Estuary (La Plata Basin, South America),... more
The objective of this study was to identify potential recruitment sources of Prochilodus lineatus from freshwater areas (Paraná and Uruguay rivers) to estuarine population of the Río de la Plata Estuary (La Plata Basin, South America), considering young (age-1) and adult (age-7) fish. LA-ICP-MS chemical analysis of the otolith core (nine element:Ca ratios) of an unknown mixed sample from Río de la Plata Estuary (2011 and 2017) was compared with a young-of-year baseline data set (same cohort) and classified into freshwater nurseries (Paraná or Uruguay river) by using maximum classification-likelihood models (MLE and MCL) and quadratic discriminant analysis (QDA). Considering the three models used, the Uruguay River was the most important contributor for both young and adult populations. The young population (2011) was highly mixed with contributions between 31.7 to 68.3%, while the degree of mixing was found to decrease in 2017 (adult fish) from 97.1 to 100% contributions. The three ...
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ABSTRACT. Oceanographic fluctuations and changes in ocean productivity directly affect the abundance and distribution of prey species, which in turn, affect the population status of their predators. In order to have a better understanding... more
ABSTRACT. Oceanographic fluctuations and changes in ocean productivity directly affect the abundance and distribution of prey species, which in turn, affect the population status of their predators. In order to have a better understanding of this predator-prey relationship, the aim of the present study was to analyze the diet of the South American Sea Lion Otaria flavescens (Shaw, 1800) in two rookeries of the San Matias Gulf, in northern Patagonia (Argentina). A total of 52 scat samples of O. flavescens were collected in the Promontorio Belén colony and 35 in Caleta de los Loros during the late spring of 2011. The analysis of the samples indicated that at both localities fish occurred in 100% of scats with prey remains, followed by cephalopods (32.3%) and crustaceans (21.4%). The fish Raneya brasiliensis (Kaup, 1856) constituted the main prey taxon, both in terms of occurrence and numerical abundance. The octopod Octopus tehuelchus (d’ Orbigny, 1834) and squids of the genus Doryteu...
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Cephalopods are important prey in the diet of top predators, such as marine mammals and seabirds. However, detailed information on their trophic relationships in the Patagonian marine ecosystem is scarce, including those cephalopod... more
Cephalopods are important prey in the diet of top predators, such as marine mammals and seabirds. However, detailed information on their trophic relationships in the Patagonian marine ecosystem is scarce, including those cephalopod species with commercial interest. The aims of this study were to evaluate the composition of the cephalopod component in the diet of Otaria byronia and determine the habitat use and trophic levels of their main cephalopod prey by measuring the stable isotopic signature of cephalopod beaks. Between May 2005 and February 2009, fresh faecal samples were collected from two sea lions rookeries in San Matias Gulf. Cephalopods occurred in 39.4% of the 1112 samples collected during the whole period of study. The dominant prey species was Octopus tehuelchus, which occurred in 45.8% of scats containing cephalopod remains, and represented 58.7% in terms of numerical abundance and 52.0% in mass of cephalopods consumed. The second species most consumed was the myopsid...
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Chasicó Lake is the main water body in the southwest of the Chaco-Pampean plain. It shows some differences from the typical Pampean shallow lakes, such as high salinity and high arsenic and fluoride levels. The aim of this paper is to... more
Chasicó Lake is the main water body in the southwest of the Chaco-Pampean plain. It shows some differences from the typical Pampean shallow lakes, such as high salinity and high arsenic and fluoride levels. The aim of this paper is to analyze the trace elements [arsenic (As), fluoride (F−) and vanadium (V)] present in Chasicó Lake. Surface and groundwater were sampled in dry and wet periods, during 2010 and 2011. Fluoride was determined with a selective electrode. As and V were determined by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES). Significant correlation in surface water was only found for As and F− (r = 0.978, p < 0.01). The As, F− and V concentration values were higher and more widely dispersed in surface water than in groundwater, as a consequence of evaporation. The fact that these elements do not correlate in surface water may also indicates that groundwater would not be the main source of origin of As, F− and V in surface water. The origin of thes...
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The presence of fluorine (F), toxic trace element, has relevance in the trophic chain because it can biotrasfer to different levels. It can come from water as food, being chronic ingestion harmful to human beings. Fluorine was found in... more
The presence of fluorine (F), toxic trace element, has relevance in the trophic chain because it can biotrasfer to different levels. It can come from water as food, being chronic ingestion harmful to human beings. Fluorine was found in different water bodies of southwest of Buenos Aires. Chasicó Lake has the highest fluorine concentration. This water body is the most important for commercial and recreational fishing silverside (Odontesthes bonariensis) of the area. The aim of this paper is to analyze the biotransfer of F from water to different silverside tissues in Chasicó Lake. Fish organs were subjected to an alkaline digestion. Fluorine was determined using a fluoride ion selective electrode. F concentrations were 6,4-8,5 mg/L in water and in fish tissues were in gonads: 4,2 to 69,4 μg/g , in liver: 7,1 to 75,3 μg/g , in gills: 49,1 to 110,1 μg/g , in vertebrae: 70,2 to 457,9 μg/g and in muscle: 5,1 to 86,8 μg/g . The concentrations found in muscle were higher than the maximum l...
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El Parque Natural de l’Albufera de Valencia es uno de los humedales más importantes de la Península Ibérica y el segundo después del Delta del Ebro en la costa mediterránea. Goza de protección desde 1986 y es sitio RAMSAR desde 1990. Es... more
El Parque Natural de l’Albufera de Valencia es uno de los humedales más importantes de la Península Ibérica y el segundo después del Delta del Ebro en la costa mediterránea. Goza de protección desde 1986 y es sitio RAMSAR desde 1990. Es un espacio esencial en las rutas migratorias de las aves en el Mediterráneo occidental. Es un humedal costero que se instala en la llanura litoral formada por los aluviones de los ríos Turia y Júcar, con la particularidad de que se encuentra en el área metropolitana de Valencia. En este espacio destaca la gran variedad de ambientes existentes, que favorecen la presencia de una elevada biodiversidad. Entre las actividades humanas desarrolladas en el humedal destaca el cultivo del arroz. Además del cultivo del arroz y otras actividades humanas desarrolladas en el Parque, a consecuencia de su situación en una zona muy antropizada, este espacio sufre una serie de presiones muy intensas que generan diversos impactos ambientales que han ido degradando el m...
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Water quality is a determining factor in the production of both traditional and nontraditional animal species since it is related to the nutritional requirements of each species. Water quality criteria often include physical- chemical and... more
Water quality is a determining factor in the production of both traditional and nontraditional animal species since it is related to the nutritional requirements of each species. Water quality criteria often include physical- chemical and organoleptic properties, the presence of toxic compounds and pathogenic bacteria as well as mineral excess. The aim of this work is to review studies on water quality for the production of traditional (bovine meat and milk) and non-traditional animal species (aquaculture and capture fisheries) in different regions of Argentina. The identification of information gaps will be the basis for new studies to improve animal production systems in ArgentinaLa calidad de agua es un factor determinante de la producción de especies animales tradicionales y no tradicionales, debido a su relación con los requerimientos nutricionales de cada especie. Los criterios que habitualmente se consideran para la determinación de la calidad del agua de bebida son sus propi...
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The identification of fish stocks in basic requirement for fishing management. The objective of this research was to describe for the first time otoliths river crocker (Plagioscion ternetzi) and to evaluate the existence of different fish... more
The identification of fish stocks in basic requirement for fishing management. The objective of this research was to describe for the first time otoliths river crocker (Plagioscion ternetzi) and to evaluate the existence of different fish stocks in the Paraguay River lower basin and the middle Paraná River (northeast Argentinean region and southeast Paraguayan region). For this purpose, five morphometric indexes applied on sagitta otolith (rectangularity, circularity AO/SO, SS/SO and PS/PO) were compared between the study sites. The sagittae otoliths are semicircular and with smooth edges. Sulcus acusticusis is heterosulcoid and curved, with an ostium open widely in the anterior margin of the otolith. Significant differences were observed for circularity, rectangularity, SS/SO and PS/PO (t-test, P < 0.05). The T2 Hotteling multiparametric analysis showed significant differences between the study sites (P < 0.006), while the canonical discriminant showed a high classification p...
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Invasive species are among the most important problems for biodiversity conservation worldwide, particularly in megadiverse countries such as Brazil. However, there is no biological information to develop policies for managing invasive... more
Invasive species are among the most important problems for biodiversity conservation worldwide, particularly in megadiverse countries such as Brazil. However, there is no biological information to develop policies for managing invasive species populations in many cases. The life history parameters and otolith variations are essential to understanding the adaptations of the species introduced in marine environments. This study aimed to identify the age structure and ontogenetic variation in the sagitta otolith of Opsanus beta. Fish samples were obtained monthly in the Paranaguá Estuarine Complex (PEC), south of Brazil. The shape indices verified ontogenetic variations in the otoliths (PERMANOVA; F = 110; P < 0.0001), but no sexual variations were observed in the shape of the otoliths (PERMANOVA; F = 3.65; P > 0.05). Specimen aged between 1 to 9 years were observed in the PEC, with the highest occurrence of individuals between 3 and 6 years (78%). No sexual differences were obse...
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The marine silverside (Odontesthes argentinensis) is an euryhaline species, distributed along the southwest coast of the Atlantic Ocean, present in estuaries, brackish coastal lagoons and shallow marine waters. It is a significant... more
The marine silverside (Odontesthes argentinensis) is an euryhaline species, distributed along the southwest coast of the Atlantic Ocean, present in estuaries, brackish coastal lagoons and shallow marine waters. It is a significant economic resource for local fisheries in southern Brazil, Uruguay and Argentina. The aim of this work was to contribute to knowledge on the stock spatial structure of the silverside, using otolith shape analysis, based on samples from nine locations in the Argentinian Sea, covering a large distribution range of the species. A combination of elliptic Fourier descriptors, Wavelet coefficients and otolith Shape indices were explored by multivariate statistical methods. The application of wavelet and combined wavelet, Fourier and Shape Indices were the most effective variables to discriminate between sampling sites (7.42 total error). PERMANOVA analysis of otolith shape revealed multivariate significant differences between north versus south locations (p < ...
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Los cambios ambientales junto con otros factores estresantes como la destrucción del hábitat, pueden causar extinciones generalizadas, disminución de la biodiversidad y alterar las comunidades naturales, resultando en un ensamble de... more
Los cambios ambientales junto con otros factores estresantes como la destrucción del hábitat, pueden causar extinciones generalizadas, disminución de la biodiversidad y alterar las comunidades naturales, resultando en un ensamble de especies nuevas. América del Sur tiene una gran diversidad de peces de agua dulce con historias evolutivas complejas, principalmente debido a la presencia de una gran variedad de ambientes acuáticos. Argentina ha experimentado un aumento en las precipitaciones en las últimas cinco décadas que lleva a importantes cambios climáticos e hidrológicos. Estos cambios provocaron el desplazamiento de las isoyetas hacia el oeste. Este estudio informa de cambios en la composición de peces de agua dulce en el noreste de Argentina durante las últimas cinco décadas e investigado una relación causal entre cambio climático y la variación en los ensambles de peces. Se analizaron los cambios en la distribución y composición de las comunidades de peces entre 1962 y 2010 en...
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La llanura pampeana es una de las grandes planicies a nivel mundial. La escasa pendiente y la geomorfología hacen que el escurrimiento de las aguas de lluvia, sea relativamente lento y presente numerosos sistemas lénticos, que poseen... more
La llanura pampeana es una de las grandes planicies a nivel mundial. La escasa pendiente y la geomorfología hacen que el escurrimiento de las aguas de lluvia, sea relativamente lento y presente numerosos sistemas lénticos, que poseen diferentes orígenes geomorfológicos y características limnológicas. En este trabajo se comparan las características más relevantes de los sistemas lénticos más comunes presentes en la zona (lagunas pampásicas) y se analizan las analogías y diferencias de dichos cuerpos de agua con un lago del sudoeste bonaerense (Lago Chasicó). Las lagunas pampásicas poseen un perfil de “palangana”, no poseen un ciclo térmico definido, poseen circulación continua, y no presentan una diferenciación entre la zona litoral y la central de la laguna. Otra de las características típicas de estos cuerpos de agua es la presencia de macrófitas. El Lago Chasicó posee un origen geomorfológico combinado tectónico-eólico, perfil en forma de “U” y una profundidad importante, signific...
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La Red CYTED “Desarrollo de metodologías, indicadores ambientales y programas para la evaluación ambiental integral y la restauración de ecosistemas degradados”, ha dado continuidad práctica a la elaboración de indicadores PEIR aplicados... more
La Red CYTED “Desarrollo de metodologías, indicadores ambientales y programas para la evaluación ambiental integral y la restauración de ecosistemas degradados”, ha dado continuidad práctica a la elaboración de indicadores PEIR aplicados a los ecosistemas degradados, pero adentrándose en uno de los aspectos de mayor complejidad e interés en Iberoamérica, que es el caso de los humedales. La experiencia está orientada a la realización de Evaluaciones Ambientales Integrales (EAI) basadas en el enfoque GEO (Global Environmental Outlook), constituye una herramienta eficaz para monitorear continuamente el estado del medio ambiente a escala global, regional y local. Un momento determinante durante las evaluaciones EAI consiste en la elaboración de indicadores apropiados para evaluar fuerzas motrices y presiones, estados e impactos. Ello se debe a que el análisis de las relaciones causa efecto entre los cambios de estado, sus causas y consecuencias tiene generalmente un carácter cualitativo...
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Lungfishes are a singular group of Sarcopterygii which in the Neotropics is represented by Lepidosiren paradoxa. They present anatomical and physiological features that allow them to survive under adverse conditions. Here we described and... more
Lungfishes are a singular group of Sarcopterygii which in the Neotropics is represented by Lepidosiren paradoxa. They present anatomical and physiological features that allow them to survive under adverse conditions. Here we described and illustrated the otoliths and determinate their composition. L. paradoxa skull is also described and illustrated with emphasis in the jaw morphology. This skull was compared with the skull of the other extant lungfishes Neoceratodus (Australian lungfish) and Protopterus (African lungfish). Experimental observations were included on the behavior in aquarium and on the construction of galleries under laboratory conditions. L. paradoxa otoliths presented subcircular shape with a convex internal face, a narrow sulcus of regular edges, marginal and parallel to the dorsal edge. The external face presented calcareous concretions and heterogeneously distributed undulations. The otholith chemical composition differs from most of marine and freshwater teleost...
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ABSTRACT Concentrations of total As was determined in water and muscle of the silverside (Odontesthes bonariensis) in four different water bodies (De la Plata River, Adela and Barranca lagoons and Chasicó Lake, Argentina) using ICP-MS.... more
ABSTRACT Concentrations of total As was determined in water and muscle of the silverside (Odontesthes bonariensis) in four different water bodies (De la Plata River, Adela and Barranca lagoons and Chasicó Lake, Argentina) using ICP-MS. The total As concentration in water (28.40-367.16μgL-1) exceeded national and international guidelines for the protection of the aquatic life. High concentrations of As (0.05-1.20 g kg-1 dry wt), were found in fish muscle however values were below international recommended limits for human consumption. The implication of As in fish products in South America is becoming an urgent issue due to the need to asses exposure limits to human consumption.
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Temperature is one of the key environmental conditions for fish distributional range, since it can restricts or expand fish habitat. Sudden environmental temperature change could be the cause of important fish mortalities and could modify... more
Temperature is one of the key environmental conditions for fish distributional range, since it can restricts or expand fish habitat. Sudden environmental temperature change could be the cause of important fish mortalities and could modify aquatic community’s structure. This work studied ability for temperature acclimation and the critical thermal maximum of a tropical fish species Rocio octofasciata and the subtropical fish species Australoheros facetus. A total of eighteen experiments with 87 specimens (n: 54 for R. octofasciata and n:33 for A. facetus ) has been performed using critical thermal maximum technique. The lethal temperature values and loss of equilibrium temperatures were identified for both species. Results suggested that R. octofasciata could acclimated at temperature between 10 and 35°C, while A. facetus at temperatures between 9,5 and 35°C. Loss of equilibrium temperature was established for R. octofasciata between 33,80 and 43,03°C and for A. facetus between 35,55...
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The white mullet, Mugil curema, is a widely distributed euryhaline species, the migratory behaviour of which is poorly understood. The objective of this work was to study the large-scale habitat use of this species for the first time.... more
The white mullet, Mugil curema, is a widely distributed euryhaline species, the migratory behaviour of which is poorly understood. The objective of this work was to study the large-scale habitat use of this species for the first time. Several environments were considered, such as euryhaline and hypersaline lagoons, the sea, and a river, distributed in the Central Pacific (Mexico) and Atlantic (Gulf of Mexico, Caribbean Sea-Venezuela, and north-eastern Brazil). Otolith core-to-edge Sr/Ca ratios of 163 fish, determined by laser ablation inductively coupled plasma mass spectrometry, were used to study the salinity-habitat migration history of the fish. Fish from Mexico (Tamiahua Lagoon, n = 4; Alvarado Lagoon, n = 2), Venezuela (n = 1), and Brazil (n = 12) (11.1% of the total) showed high Sr/Ca values at early life stages and were classified as marine estuarine opportunists. Two specimens (from Alvarado Lagoon and Balsas River, Mexico) showed Sr/Ca values consistently below the high salinity guide value (salinity < 33.5). For the rest of the fish (87.1%), the Sr/Ca ratio suggested a displacement from the estuary towards the sea or hypersaline environments, and so these fish were classified as estuarine migrants. A change-point analysis identified six individuals with a single stable otolith Sr/Ca signature through ontogeny (three from Brazil, one from Venezuela, and two from Tamiahua Lagoon, Mexico), suggesting limited displacement between environments with different salinities. The rest of the individuals showed between two and 10 changes in stable Sr/Ca signatures (mean = 4.07 ± 1.85). The highest number of changes in Sr/Ca ratio (4.87 ± 1.1) was found in fish from Laguna Madre (Mexico) and the lowest was found in fish from Brazil (3.27 ± 1.70) (H = 19.8, p = 0.002). Otolith Sr/Ca time series suggest that the migratory estuarine pattern is the most common throughout the study area. This work highlights that the sustainable use of M. curema depends on the conservation of estuaries and the corridors between them and other environments such as lagoons, rivers, mangroves and the sea.Fil: Avigliano, Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Unidad Ejecutora de Investigaciones en Producción Animal. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Unidad Ejecutora de Investigaciones en Producción Animal; ArgentinaFil: Ibañez, Ana. Universidad Autónoma del Estado de México; MéxicoFil: Fabré, Nidia. Universidade Federal de Alagoas; BrasilFil: Callicó Fortunato, Roberta Glenda. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Unidad Ejecutora de Investigaciones en Producción Animal. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Unidad Ejecutora de Investigaciones en Producción Animal; ArgentinaFil: Méndez, Ana. Universidad de Oviedo; EspañaFil: Pisonero, Jorge. Universidad de Oviedo; EspañaFil: Volpedo, Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Unidad Ejecutora de Investigaciones en Producción Animal. Universidad de Buenos Aires. Facultad de Ciencias Veterinarias. Unidad Ejecutora de Investigaciones en Producción Animal; Argentin