Journal ArticleDOI
Accumulation, regulation and toxicity of copper, zinc, lead and mercury in Hyalella azteca
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TLDR
Short term exposures to copper result in elevated copper concentrations in H. azteca, even at concentrations below those causing chronic toxicity, and short term bioaccumulation studies might, therefore, provide a useful indication of potential chronic copper toxicity.Abstract:
Zinc, lead and mercury accumulation in the amphipod Hyalella azteca increases with increasing exposure to metals. During 10 week chronic toxicity tests, metal accumulated at the highest non-toxic/lowest toxic concentration was 126/136 µg Zn g−1, 7.1/16 µg Pb g−1 and 56/90 µg Hg g−1 dry weight. Concentrations of lead and mercyry in control animals were substantially lower (1.3 µg Pb g−1 and 0.4 µg Hg g−1), but concentrations of zinc in controls (74 µg g−1) were about one half those of the lowest toxic concentration. Copper was completely regulated. Accumulated copper concentrations after 10 weeks exposure to all waterborne copper concentrations resulting in less than 100% mortality were not significantly different from controls (79 µg g−1). Lead and mercury concentrations in wild H. azteca should be useful indicators of potential toxicity. Zinc accumulation may also be a useful indicator of zinc toxicity, but careful comparison with control or reference animals is necessary because of the small differences between toxic and control concentrations. Copper is not accumulated by H. azteca under chronic exposure conditions and body burdens of field animals cannot be used as an indicator of exposure or potential toxic effects. Short term exposures to copper, however, result in elevated copper concentrations in H. azteca, even at concentrations below those causing chronic toxicity. Short term bioaccumulation studies might, therefore, provide a useful indication of potential chronic copper toxicity.read more
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References
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Journal ArticleDOI
Effects of various metals on survival, growth, reproduction, and metabolism of Daphnia magna
TL;DR: The toxicities of various metals to Daphnia magna were evaluated on the basis of a 48-hr 50% lethal concentration (LC50) a 3-week LC50, and a 16% decrease in the number of young born (reproductive ...
Journal ArticleDOI
Comparative strategies of heavy metal accumulation by crustaceans: zinc, copper and cadmium in a decapod, an amphipod and a barnacle
Philip S. Rainbow,S. L. White +1 more
TL;DR: Uptake rates for zinc and cadmium have been estimated for the three crustaceans and can be interpreted in terms of cuticle permeability and way of life of each crustacean.
Journal ArticleDOI
Comparative study of the patterns of bioaccumulation of essential (Cu, Zn) and non-essential (Cd, Pb) trace metals in various estuarine and coastal organisms
TL;DR: In one fish and one decapod crustacean species it has been shown that the regulation mechanisms may be functional since early life stages, when the duration of exposure to essential metals increases, the regulation mechanism is disturbed by more and more low additional concentrations in sea water.
Journal ArticleDOI
Toxicity test procedures for Hyalella azteca , and chronic toxicity of cadmium and pentachlorophenol to H. azteca, Gammarus fasciatus , and Daphnia magna
TL;DR: Amphipods are at least as sensitive as Daphnia to a variety of toxicants during chronic exposure, and have shown dramatic improvements in both reproduction and growth when only artificial plastic substrate is provided.
Journal ArticleDOI
Relationship between chronic toxicity and bioaccumulation of cadmium in Hyalella azteca
TL;DR: The chronic toxicity of Cd to Hyalella in Burlington City tap (Lake Ontario) water with additions of complexing agents, distilled water, or sediments was much more constant if toxicity was expressed as a function of cd bioaccumulated, rather than the Cd concentrations added or measured in the water.
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