Document Detail


Rapid, efficient growth reduces mercury concentrations in stream-dwelling Atlantic salmon.
MedLine Citation:
PMID:  20436784     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Mercury (Hg) is a potent toxin that biomagnifies in aquatic food webs. Large fish generally have higher Hg concentrations than small fish of the same species. However, models predict that fish that grow large faster should have lower Hg concentrations than small, slow-growing fish due to somatic growth dilution (SGD). We examined the relationship between Hg concentrations and growth rate in fish using a large-scale field experiment. Atlantic salmon (Salmo salar) fry hatched under uniform initial conditions were released at eighteen sites in natural streams, collected after one growing season, and Hg concentration and growth measured. As expected for Hg accumulation from food, mercury concentrations in salmon tracked Hg concentrations in their prey. Nonetheless, large, fast-growing salmon had lower Hg concentrations than small, slow-growing salmon, consistent with SGD. While prey Hg concentration accounted for 59% of the explained variation in salmon Hg concentration across sites, salmon growth rate accounted for 38% of the explained variation independent of prey Hg concentration. A mass-balance Hg accumulation model shows that such SGD occurs when fast growth is associated with high growth efficiency. Fish growth is tremendously variable and sensitive to anthropogenic impacts, so SGD of Hg has important implications for fisheries management.
Authors:
Darren M Ward; Keith H Nislow; Celia Y Chen; Carol L Folt
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  Transactions of the American Fisheries Society     Volume:  139     ISSN:  1548-8659     ISO Abbreviation:  -     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-7-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7506101     Medline TA:  Trans Am Fish Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1-10     Citation Subset:  -    
Affiliation:
Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA.
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MeSH Terms
Descriptor/Qualifier:
Grant Support
ID/Acronym/Agency:
P42 ES007373-150016//NIEHS NIH HHS

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