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Laboratory and Field Studies of Cadmium Effects on Hyalella Azteca in Effluent Dominated Systems

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Laboratory single-species toxicity tests are used to assess the effects of contaminants on aquatic biota. Questions remain as to how accurately these controlled toxicity tests predict sitespecific bioavailability and effects of metals. Concurrent 42-day Hyalella azteca exposures were performed with cadmium and final treated municipal effluent in the laboratory and at the University of North Texas Stream Research Facility. Further laboratory testing in reconstituted hard water was also conducted. Endpoints evaluated include survival, growth, reproduction, and Cd body burden. My results demonstrate that laboratory toxicity tests may overestimate toxicity responses to cadmium when compared to effluent dominated stream exposures. Discrepancies between endpoints in the three tests likely resulted from increased food sources and decreased cadmium bioavailability in stream mesocosms

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Date Of Record Release 2010-05-24 16:28:53
Description Library Holdings.

Laboratory single-species toxicity tests are used to assess the effects of contaminants on aquatic biota. Questions remain as to how accurately these controlled toxicity tests predict sitespecific bioavailability and effects of metals. Concurrent 42-day Hyalella azteca exposures were performed with cadmium and final treated municipal effluent in the laboratory and at the University of North Texas Stream Research Facility. Further laboratory testing in reconstituted hard water was also conducted. Endpoints evaluated include survival, growth, reproduction, and Cd body burden. My results demonstrate that laboratory toxicity tests may overestimate toxicity responses to cadmium when compared to effluent dominated stream exposures. Discrepancies between endpoints in the three tests likely resulted from increased food sources and decreased cadmium bioavailability in stream mesocosms
Classification
Resource Type
Format
Subject
Source University of North Texas
Keyword Stream mesocosms, Cadmium, Hyalella azteca, Lab-to-field
Selector Selection Committee
Date Of Record Creation 2010-05-24 16:23:20
Education Level
Date Last Modified 2010-06-07 14:07:58
Creator Stanley, Jacob K.
Language English
Date Record Checked: 2010-05-24 00:00:00 (W3C-DTF)

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