Copper toxicity for Scinax ruber and Rhinella granulosa (Amphibia: Anura) of the Amazon: Potential of Biotic Ligand Model to predict toxicity in urban streams

Acta Amazonica

Jorge Felipe Oliveira Franco-de-sá¹  Adalberto Luis Val¹ 

[1] ,Instituto Nacional de Pesquisas da Amazônia Laboratório de Ecofisiologia e Evolução MolecularAM ,Brazil

关键词: Amphibian;    LC50-96h;    copper;    BLM;    water pollution;    anfíbios;    CL50-96h;    cobre;    BLM;    poluição das águas;   

DOI  :  10.1590/1809-4392201400383

来源: SciELO

【 摘 要 】

In the last years many populations of anurans have declined and extinctions have been recorded. They were related to environmental pollution, changes of land use and emerging diseases. The main objective of this study was to determine copper sensitivity of the anuran of the Amazon Rhinella granulosa and Scinax ruber tadpoles at stage 25 and Scinax ruber eggs exposed for 96 h to copper concentrations ranging from 15 µg Cu L-1 to 94 µg Cu L-1. LC50 at 96 h of Rhinella granulosa Gosner 25, Scinax ruber Gosner 25 and Scinax ruber eggs in black water of the Amazon were 23.48, 36.37 and 50.02 µg Cu L-1, respectively. The Biotic Ligand Model was used to predict the LC50 values for these species and it can be considered a promising tool for these tropical species and water conditions. Copper toxicity depends on water physical-chemical composition and on the larval stage of the tadpoles. The Gosner stage 19-21 (related to the appearance of external gills) is the most vulnerable and the egg stage is the most resistant. In case of contamination by copper, the natural streams must have special attention, since copper is more bioavailable.

【 授权许可】

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