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Laboratory and field studies of cadmium effects on Hyalella azteca in effluent dominated systems.

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

Identiferoai:union.ndltd.org:unt.edu/info:ark/67531/metadc4291
Date08 1900
CreatorsStanley, Jacob K.
ContributorsLa Point, Thomas W., 1949-, Kennedy, James H., Waller, William T.
PublisherUniversity of North Texas
Source SetsUniversity of North Texas
LanguageEnglish
Detected LanguageEnglish
TypeThesis or Dissertation
FormatText
RightsPublic, Copyright, Stanley, Jacob K., Copyright is held by the author, unless otherwise noted. All rights reserved.

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