Document Detail


Interactive effects of maternal and dietary mercury exposure have latent and lethal consequences for amphibian larvae.
MedLine Citation:
PMID:  21428394     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Organisms born into the same contaminated environment as their parents can be exposed both maternally and environmentally to contaminants, potentially placing them at greater risk of adverse effects than when exposed via either of the two pathways independently. We examined whether embryonic exposure to maternally derived mercury (Hg) interacts with dietary exposure to negatively influence larval development in American toads ( Bufo americanus ). We collected eggs from breeding pairs at reference and Hg-contaminated sites and monitored performance, development, and survival of larvae fed three experimental Hg diets (total Hg, 0.01, 2.5, and 10 μg/g). The negative sublethal effects of maternal and/or dietary Hg manifested differently, but maternal Hg exposure had a greater overall influence on offspring health than dietary exposure. However, the combination of sublethal effects of the two exposure routes interacted with lethal consequences; larvae exposed to maternal Hg and high dietary Hg experienced 50% greater mortality compared to larvae from reference mothers fed the control diet. This study is the first to demonstrate that the latent effects of maternally transferred contaminants may be exacerbated by further exposure later in ontogeny, findings that may have important implications for both wildlife and human health.
Authors:
Christine M Bergeron; William A Hopkins; Brian D Todd; Mark J Hepner; Jason M Unrine
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-23
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Wildlife Ecotoxicology and Physiological Ecology Program, Department of Fish and Wildlife Conservation, Virginia Tech , Blacksburg, Virginia 24061, United States.
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