Alejandra Volpedo - Academia.edu (original) (raw)

Papers by Alejandra Volpedo

Sustainability

Argentina is one of the countries that exports animals for equestrian sports. This paper analyzes... 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...

Austral Ecology

Sturgeon (Acipenser baerii and A. gueldenstaedtii) specimens, native to the northern hemisphere, ... 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...

Environmental Biology of Fishes

The wrong Supplementary file was originally published with this article; it has now been replaced... more The wrong Supplementary file was originally published with this article; it has now been replaced with the correct file.

La bioindicación en el monitoreo y evaluación de los sistemas fluviales de la Argentina: Bases para el análisis de la integridad ecológica, 2020

Water availability and quality are two key factors for life and development in any region of the ... more Water availability and quality are two key factors for life and development in any region of the world. Latin America is one of the regions of the planet that has the most significant amount of water resources available. The agricultural activity is the responsible of the higher demand for the water. The different activities in which water is used require a particular quality, and it is important not to use water of superior quality for a use that does not require it. It can be considered that almost all uses can contaminate the resource and make it unsuitable for other purposes, which makes its treatment indispensable. Water deterioration is not only due to the impact of anthropic activities, but there may also be causes of natural origin. For the study of water quality, physical, chemical, and biological indicators are traditionally used, which then allow the development of water quality indices, which are a key tool in the management and administration of water resources. The objective of this work is to analyze the main physicalchemical indicators of water quality and discuss its application in different cases.

espanolLos otolitos de los peces son complejos policristalinos, compuestos principalmente por car... 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...

espanolEl Rio Uruguay integra junto con el Parana y el Paraguay la Cuenca del Plata; recorriendo ... 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...

Resumen. El arsénico (As) es un tóxico natural presente en aguas subterráneas y superficiales. En... more Resumen. El arsénico (As) es un tóxico natural presente en aguas subterráneas y superficiales. En este trabajo se estimó el riesgo por ingesta de agua subterránea con elevadas concentraciones de As para pobladores rurales bonaerenses. Además se consideró una fuente adicional de exposición a la presencia de As en tejidos blandos del pejerrey (Odontesthes bonariensis), que es la especie nativa de mayor importancia comercial. La concentración de As se determinó por espectroscopía de emisión atómica por plasma de acoplamiento inductivo (ICP-OES). En las muestras de agua subterránea las concentraciones se hallaron en el rango de <10-170 µg/l, mientras que en músculos de peces estuvo comprendida entre 0,29-8,41 µg/g y en hígado entre 0,24-8,98 µg/g (en peso seco). El hidroarsenicismo crónico regional endémico Argentino (HACREA), enfermedad que se origina por el consumo de cantidades variables de As en un largo período de tiempo, genera diferentes afecciones de piel. El riesgo estimado por ingesta de agua subterránea en todas las localidades estudiadas superó el valor aceptado de riesgo individual máximo (10-5), según la Agencia de Protección Ambiental de los Estados Unidos (USEPA). Los niveles de As hallados en tejidos de peces, sugieren que existiría transferencia de este elemento desde el agua a los distintos órganos, que podría resultar perjudicial para el consumo humano.

El objetivo de este trabajo es el estudio de la morfologia de la sagitta y el calculo de los para... 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...

Environmental Biology of Fishes, 2021

The potential use of Sr/Ca and Ba/Ca ratios in fish otolith, as a complement to 87 Sr/ 86 Sr to s... more The potential use of Sr/Ca and Ba/Ca ratios in fish otolith, as a complement to 87 Sr/ 86 Sr to study movements of Prochilodus lineatus, was evaluated in the La Plata Basin (South America). Water ratios were obtained from samples collected during the high and Elemental and isotopic ratios in water were measured by MC-ICP-MS, ICP-MS and ion chromatography, and obtained from available literature. Fish were caught from six different sites with different physiochemical features. Otolith core-to-edge Sr/Ca and Ba/Ca profiles were determined by LA-ICP-MS, while the otolith 87 Sr/ 86 Sr data set was taken from literature. The predictive classification by rivers according to water Sr/Ca, Ba/Ca and 87 Sr/ 86 Sr ratios (92.5%) was higher than that based solely on 87 Sr/ 86 Sr (58%), with classification that reached 100% for several rivers. Unlike Ba/Ca, a significant relationship (R 2 = 0.94, p < 0.05) was found between otolith edge and water Sr/Ca, suggesting that this could be an efficient movement indicator for P. lineatus. The Sr/Ca ratio complemented the information provided by Sr isotopes and it was particularly useful in the northwest basin, where the isotopes alone do not allow differentiating between large rivers.

Environmental Science and Pollution Research, 2021

The Atlantic Rainforest is among the main biodiversity hotspots in the world, the Yabotí Biospher... 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.

Fisheries Research, 2021

Abstract The whitemouth croaker Micropogonias furnieri is a demersal sciaenid fish widely distrib... 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

New Zealand Journal of Marine and Freshwater Research, 2021

White sea catfish Genidens barbus is an endangered amphidromous species distributed between north... more White sea catfish Genidens barbus is an endangered amphidromous species distributed between northeastern Brazil and northern Argentine Patagonia, whose migratory behaviour at the southern end of its range is unknown. Here, the migratory patterns of this species were studied including marine and freshwater (Patagonian stock) environments via otolith core-toedge Sr/Ca and Ba/Ca profiles. Based on the Sr/Ca ratio, all specimens were classified as amphidromous with annual cycles of movement between waters of relatively low to high salinity occurring during spring. The core Sr/Ca ratio matched with the reference values for freshwater in all specimens. No evidence of resident freshwater or marine individuals was found. No evident antagonistic relationship was found between both Sr/Ca and Ba/ Ca ratios. A Ba/Ca peak was observed followed by a drop coinciding with the core edge, highlighting the need to evaluate the potential transfer from the yolk, and to understand what factors are linked to the growth marks within the first year of life.

Frontiers in Marine Science, 2020

Journal of Fish Biology, 2020

The white mullet Mugil curema supports several fisheries in the neotropical region; nevertheless,... 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...

SN Applied Sciences, 2020

One of the key factors for equine production is water, its availability in sufficient quantity an... more One of the key factors for equine production is water, its availability in sufficient quantity and adequate quality. Studies about water quality in equine production worldwide are limited and even more limited in Argentina (South America). However, the amount of horses in Argentina declared by National Service of Agri-Food Health and Quality is of 2.5 million heads approximately, being most of them in Buenos Aires Province. The aim is to characterize the water quality in equine production farms in Buenos Aires Province, Argentina. Groundwater samples were taken from 26 equine production farms where physicochemical parameters (pH, conductivity, total hardness, chlorides, nitrates and total dissolved solids), water wells' depth and the distance from the farms to the city of Buenos Aires were registered. The values of physicochemical parameters were correlated with the distance to the city of Buenos Aires to assess the influence of the alterations in groundwater quality resulting from pollution in the city of Buenos Aires and its periphery and the depth of the wells using the Spearman correlation (p < 0.05). The results of the work show that there is an association between farms' water quality and the distance to the city of Buenos Aires. The depth presents significant positive correlation with the conductivity, chloride and total dissolved solids and negative correlation with nitrates. This suggests that sources of groundwater near to the city of Buenos Aires present a lower water quality. In conclusion, the water equine production farms in Buenos Aires Province were negatively related to the distance from Buenos Aires city. Equine farms closest to the city (< 80 km) may present different problems to be considered: the excessive salinity and the presence of nitrates from anthropic origin.

Environmental Biology of Fishes, 2020