Effects of Cadmium on Calcium homeostasis and physiological conditions of the freshwater Mussel Anodonta anatina
type: CreativeWork
description: Summary As the result of the worldwide decline of freshwater mussels, some significant wetland and riverine habitats are threatened. It has been shown that cadmium (Cd), among other heavy metals, is present at surprisingly high levels in freshwater pearl mussels from mountain brooks in central Europe. This metal is likely to be one of the factors involved in the decline because of its high toxicity, bioaccumulation potential and transfer through food chains. In natural ecosystems, aquatic animals are usually exposed to Cd from both the dissolved- and the particulate-phase, and at lower levels than those used in standard toxicity testing. The aim of this study was to investigate the effects of environment-like Cd levels on its bioaccumulation, tissue distribution and on the redistribution of background Cd (Cd present in animals prior to the experiment) among body compartments of the freshwater mussel Anodonta anatina by exposure to both algae- and water-borne 111Cd (about 0.2 µg/L) for 35 days followed by 120 days of depuration. Furthermore, the effects of Cd on calcium (Ca) homeostasis, condition index, energy reserves, carbonic anhydrase activity and their correlations were examined and evaluated. Before mussels were exposed to Cd, a Cd-exposure experiment with the green algae Parachlorella kessleri was carried out for producing 111Cd-loaded algae suitable for exposed mussels as food of the same quality as non-contaminated algae. P. kessleri were grown at four Cd concentrations (0, 0.5, 2, 8 and 32 µg/L) for 5 days, starting from day 2 after inoculation. At 8 µg Cd/L and higher, Cd showed clear effects on algal growth, cell morphology, size and algal physiological state. The minimum Cd concentration at which the algae were significantly different from the control group was about 3 µg/L. At a Cd concentration of 2 µg/L, algae exhibited a comparable physiological state to the control which was used to grow 111Cd-carrying food for the test mussels. In the mussel expos…
abstract: Summary As the result of the worldwide decline of freshwater mussels, some significant wetland and riverine habitats are threatened. It has been shown that cadmium (Cd), among other heavy metals, is present at surprisingly high levels in freshwater pearl mussels from mountain brooks in central Europe. This metal is likely to be one of the factors involved in the decline because of its high toxicity, bioaccumulation potential and transfer through food chains. In natural ecosystems, aquatic animals are usually exposed to Cd from both the dissolved- and the particulate-phase, and at lower levels than those used in standard toxicity testing. The aim of this study was to investigate the effects of environment-like Cd levels on its bioaccumulation, tissue distribution and on the redistribution of background Cd (Cd present in animals prior to the experiment) among body compartments of the freshwater mussel Anodonta anatina by exposure to both algae- and water-borne 111Cd (about 0.2 µg/L) for 35 days followed by 120 days of depuration. Furthermore, the effects of Cd on calcium (Ca) homeostasis, condition index, energy reserves, carbonic anhydrase activity and their correlations were examined and evaluated. Before mussels were exposed to Cd, a Cd-exposure experiment with the green algae Parachlorella kessleri was carried out for producing 111Cd-loaded algae suitable for exposed mussels as food of the same quality as non-contaminated algae. P. kessleri were grown at four Cd concentrations (0, 0.5, 2, 8 and 32 µg/L) for 5 days, starting from day 2 after inoculation. At 8 µg Cd/L and higher, Cd showed clear effects on algal growth, cell morphology, size and algal physiological state. The minimum Cd concentration at which the algae were significantly different from the control group was about 3 µg/L. At a Cd concentration of 2 µg/L, algae exhibited a comparable physiological state to the control which was used to grow 111Cd-carrying food for the test mussels. In the mussel expos…
author: Ngo, Thi Thuy Huong
date published: 2008-07-17
date modified: 2026-07-27T18:49:19Z
provider: Universität Bayreuth
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Universität Bayreuth