Seasonal factors driving biochemical biomarkers in two fish species from a subtropical reservoir in southern Brazil: An integrated approach

Environmental Pollution
Aline Monique Blank do AmaralBarbara Clasen

Abstract

Reservoirs are lentic man-made waterbodies resulting from river damming processes. Pollutants coming from adjacent areas can accumulate in the water and sediment of these modified freshwater environments. Fish are often found in reservoirs occupying several trophic niches. Biochemical biomarkers are early warning signals of environmental disturbance to an organism. It is essential to understand how pollutants, abiotic variables and biochemical biomarker responses behave throughout the seasons to implement biomonitoring programs. Loricariichthys anus and Geophagus brasiliensis were collected, and abiotic variables were seasonally measured for one year, at six sampling sites in Passo Real reservoir, in a subtropical region of Southern Brazil. Biochemical biomarkers were analyzed in four tissues of both fish species, as well as metal and pesticide concentrations in the reservoir's water and sediment. Redundancy analysis (RDA) was carried out to find the temporal relationship between biomarkers and environmental variables. RDA has clearly shown the separation of seasons for both species. Azoxystrobin, simazine and propoxur were the pesticides mostly contributing to the variation, whereas metals had lesser contribution to it. Season...Continue Reading

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Sep 22, 2020·Ecotoxicology and Environmental Safety·Carjone GonçalvesVania Lucia Loro
Jun 18, 2021·Archives of Environmental Contamination and Toxicology·Luciana Joner GuerraVania Lucia Loro
Jul 29, 2021·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Atsler Luana LehunAna Carolina de Deus Bueno Krawczyk

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