Hepatic bioaccumulation of cadmium in the crowned bullfrog, Hoplobatrachus occipitalis and flat backed toad, Bufo maculatus

Document Type : Primary Research paper



The hepatic bioaccumulation of cadmium in Hoplobatrachus occipitalis and Bufo maculatus were assessed for 14 and 28 days respectively. The amphibians were exposed to sub lethal cadmium concentrations of 0.25, 0.50, 1.00 and 2.00 mg/l. Bioaccumulation in H. occipitalis and B. maculatus increased significantly (p<0.05) in both periods of exposures. There was no significant difference in bioaccumulation between the 14 and 28 days exposures. There was also no significant difference in the bioaccumulation of cadmium between two amphibian species. The study suggested that the release of cadmium into the environment could possibly affect the well-being of amphibians as well as resulting in further decline of these very sensitive organisms that contribute significantly to the food web. There is therefore the need to protect amphibians from habitat alteration due to cadmiumpollution with a view to sustaining the rich biodiversity in the Nigerian Niger Delta ecological zone.