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Title: Evidence of estrogenic mixture effects on the reproductive performance of fish
Authors: Brian, JV
Harris, CA
Scholze, M
Kortenkamp, A
Booy, P
Lamoree, M
Pojana, G
Jonkers, N
Marcomini, A
Sumpter, JP
Keywords: Mixture toxicity;Estrogens;Reproduction;Fitness;Fecundity;Vittelogenin
Issue Date: 2007
Publisher: American Chemical Society
Citation: Critical Reviews in Environmental Science and Technology, 41(1): 337 - 344, Nov 2007
Abstract: Recent research into the effects of mixtures of estrogenic chemicals has revealed the capacity for similarly acting chemicals to act in combination, according to the principles of concentration addition. This means that, collectively, they may pose a significant environmental risk, even when each component is present at a low and individually ineffective concentration. The aim of this study was to investigate the ecological significance of mixture effects at low-effect concentrations by assessing the combined effect of estrogenic chemicals on the reproductive performance of fish. Pairs of fathead minnows were exposed to five estrogenic chemicals. Endpoints analyzed included fecundity, the expression of male secondary sexual characteristics, somatic indices, and vitellogenin induction. In the first phase of the study, a concentration-response analysis was performed to investigate the relative sensitivity of these endpoints. In the second phase, mixture effects at low-effect concentrations were explored by exposing fish to each of the mixture components, individually and in combination. Data from these experiments provide evidence of mixture effects on fitness and fecundity, demonstrating the capacity for chemicals to act together to affect reproductive performance, even when each component is present belowthe threshold of detectable effects. This has important implications for hazard assessment and contributes to our understanding of mixture effects at increasing levels of biological complexity.
Description: The official published version can be obtained from the link below - Copyright @ 2007 American Chemical Society
ISSN: 0013-936X
Appears in Collections:Environment
Institute for the Environment

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