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 ... continued below

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Stanley, Jacob K. August 2003.

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  • Stanley, Jacob K.

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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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  • August 2003

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  • Feb. 15, 2008, 2:52 p.m.

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  • May 24, 2013, 12:06 p.m.

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Stanley, Jacob K. Laboratory and field studies of cadmium effects on Hyalella azteca in effluent dominated systems., thesis, August 2003; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc4291/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .