Toxicity and Bioaccumulation of Cadmium in the Freshwater Bivalve Corbicula Fluminalis Müller, 1774.

Abstract

ABSTRACThe influence of different concentrations of cadmium on Corbicula fluminalis was examined by a toxicity experiment. Acute toxicity was analyzed by measurement of the 96h. LC50 and daily survival rates.

Acute toxicity of potentially toxic elements on ciliated protozoa from Lake Maracaibo (Venezuela)

“…In various investigations the sensitivity of protozoa and other aquatic organisms to Cd(II) has been described, for example: Colpoda steinii (protozoa) of 0.5-5.0 mg.L -1 (Díaz et al, 2006), Tetrahymena owiformis (protozoa) of 3-10 mg.L -1 (Sauvant et al, 1995), D. magna (microcrustacean) of 0.004 mg.L -1 (Okamoto et al, 2015), Corbicula fluminalis (bivalve) of 0.52-0.56 mg.L -1 (Abdel-Gawad, 2006) and Channa punctatus (fish) of 5.2-8.4 mg.L -1 (Gupta & Rajbanshi, 1988). In contrast, it has been reported that the tolerance of protozoa to Cd(II) may be due to the following mechanisms: i) formation of granules resistant to higher concentrations of the element (Nilsson, 1981), which can contain several elements and function as structures involved in detoxification or regulation of metal ions (Dunlop & Chapman, 1981); ii) formation of a metallothionein related to stress regulation by PTE (Martín-González et al, 2006), where Cd induces a Cd-metallothionein tetramer similar in amino acid composition to metallothioneins from certain invertebrates and vertebrates (Piccinni et al, 1987).…”