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Gutierrez J.M.,Seccion Oceanografia y Ecologia Marina | Villar S.,Servicio de MEB | Acuna Plavan A.,Seccion Oceanografia y Ecologia Marina
Marine Pollution Bulletin | Year: 2015

Genotoxic agents may exert damage that may be active through following generations. Micronuclei are cytoplasmic chromatin masses outside the main cell nucleus, indicators of chromosomal damage. This study applied micronuclei test to evaluate genetic damage of fish in three breeding and nursery areas of commercially important fishes exposed to differing degrees of anthropogenic impact: Pando, Solís Chico and Solís Grande sub-estuaries. The micronuclei test revealed differences in the presence and concentrations of genotoxic components in these sub-estuaries. Fish in the urban and industrialized Pando sub-estuary presented the highest percentages of micronuclei. The absence of seasonal changes in micronuclei in Pando fish could be explained by physical characteristics of the sub-estuary and by regional weather conditions. Odontesthes argentinensis (Valenciennes, 1835) was the species most susceptible to genotoxic components. It is recommended the use of a battery of biomarkers to better explain the health of organisms in that important nursery area. © 2014 Elsevier Ltd. Source

Garcia-Rodriguez F.,Seccion Oceanografia y Ecologia Marina | Brugnoli E.,Seccion Oceanografia y Ecologia Marina | Muniz P.,Seccion Oceanografia y Ecologia Marina | Venturini N.,Seccion Oceanografia y Ecologia Marina | And 7 more authors.
Marine and Freshwater Research | Year: 2014

We studied the changes in geochemical variables in the middle section of Río de la Plata estuary during the 2009-2010 El Niño-Southern Oscillation (ENSO) event. Protein, organic matter, chlorophyll-a and phaeopigment content of surface sediments were significantly correlated with the increased continental freshwater input associated with high total monthly rainfall. During the warm-phase ENSO event, river flow was 5-fold larger than average historical levels, which led to a steady decrease in salinity values and the highest levels of geochemical variables. The evidence presented herein suggests that warm-phase ENSO events increase the trophic state of the sediments because of the increased freshwater input. Thus, our findings may be useful to anticipate potential eutrophication episodes in the study area. © CSIRO 2014. Source

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