Zinc uptake rate and regulation breakdown in the decapod crustaceanPalaemon elegansrathke

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Abstract
The regulation of an approximately constant body zinc. concentration by the decapod crustacean Palaemon elegans Rathke is a net effect of relative rates of zinc uptake and zinc loss, regulation breaking down on exposure to high dissolved zinc concentrations. Evidence is presented that intraspecific differences in zinc uptake rates are the major factors in determining whether individual P. elegans are able to maintain zinc regulation at zinc exposures near the threshold of regulation breakdown. For example at 178 μg Zn · 1-1 in artificial seawater (32 ppt) at 10°C, all prawns with uptake rates greater than 3.5 μg Zn · g-1·day-1 showed regulation breakdown. Sex or size of individual does not affect the rate of zinc uptake (μg Zn· g-1·day-1) of Palaemon elegans, nor subsequently the relative ability to regulate the body zinc concentration under conditions of high zinc bioavailability.