Cadmium effects on the carbon and energy balance of mudsnails |
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Authors: | Valery E Forbes Michael H Depledge |
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Institution: | (1) Ecotoxicology Group, Biology Institute, Odense University, DK-5230 Odense M, Denmark;(2) Present address: Dept. of Marine Ecology and Microbiology, National Environmental Research Institute, Frederiksborgvej 399, P.O. Box 358, DK-4000 Roskilde, Denmark |
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Abstract: | The present study examined the ability of shortterm physiological measurements to predict growth rates of a gastropod, Hydrobia ulvae, in response to pollutant exposure. Whereas growth rates of snails collected from Munkebo Harbor, Funen, Denmark in 1989 were substantially reduced by exposure to cadmium after ca. 3 wk, we could detect no change in total carbon balance measured in short-term radioisotope experiments. At 23 S, the reduction in percent growth after 3 wk was 186.4 for snails exposed to 100 g Cdl-1 and 225.7 for snails exposed to 200 g Cdl-1. At 13 S, the reduction in percent growth was 102.6 at 100 g Cdl-1 and 106.4 at 200 g Cdl-1. We found no effect of cadmium on sediment egestion rate over 18 d of exposure. Nor could we detect effects on carbon absorption efficiency or metabolic loss of absorbed carbon during the first 24 h following its ingestion. The fractional loss of 14C from uniformly-labeled snails showed a decrease in CO2 and an increase in dissolved carbon in snails exposed to 200 g Cdl-1. Such changes in the partitioning of carbon loss from body stores suggest a partial shift from aerobic to anaerobic metabolic pathways which could reconcile the seeming disparity between growth and carbon balance in response to cadmium exposure. |
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