Document Detail

Increased selenium threat as a result of invasion of the exotic bivalve Potamocorbula amurensis into the San Francisco Bay-Delta.
MedLine Citation:
PMID:  11879938     Owner:  NLM     Status:  MEDLINE    
Following the aggressive invasion of the bivalve, Potamocorbula amurensis, in the San Francisco Bay-Delta in 1986, selenium contamination in the benthic food web increased. Concentrations in this dominant (exotic) bivalve in North Bay were three times higher in 1995-1997 than in earlier studies, and 1990 concentrations in benthic predators (sturgeon and diving ducks) were also higher than in 1986. The contamination was widespread, varied seasonally and was greater in P. amurensis than in co-occurring and transplanted species. Selenium concentrations in the water column of the Bay were enriched relative to the Sacramento River but were not as high as observed in many contaminated aquatic environments. Total Se concentrations in the dissolved phase never exceeded 0.3 microg Se per l in 1995 and 1996; Se concentrations on particulate material ranged from 0.5 to 2.0 microg Se per g dry weight (dw) in the Bay. Nevertheless, concentrations in P. amurensis reached as high as 20 microg Se per g dw in October 1996. The enriched concentrations in bivalves (6-20 microg Se per g dw) were widespread throughout North San Francisco Bay in October 1995 and October 1996. Concentrations varied seasonally from 5 to 20 microg Se per g dw, and were highest during the periods of lowest river inflows and lowest after extended high river inflows. Transplanted bivalves (oysters, mussels or clams) were not effective indicators of either the degree of Se contamination in P. amurensis or the seasonal increases in contamination in the resident benthos. Se is a potent environmental toxin that threatens higher trophic level species because of its reproductive toxicity and efficient food web transfer. Bivalves concentrate selenium effectively because they bioaccumulate the element strongly and lose it slowly; and they are a direct link in the exposure of predaceous benthivore species. Biological invasions of estuaries are increasing worldwide. Changes in ecological structure and function are well known in response to invasions. This study shows that changes in processes such as cycling and effects of contaminants can accompany such invasions.
Regina G Linville; Samuel N Luoma; Lynda Cutter; Gregory A Cutter
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aquatic toxicology (Amsterdam, Netherlands)     Volume:  57     ISSN:  0166-445X     ISO Abbreviation:  Aquat. Toxicol.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-03-06     Completed Date:  2002-08-02     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8500246     Medline TA:  Aquat Toxicol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  51-64     Citation Subset:  IM    
US Geological Survey, 345 Middlefield Road, Mail Stop 465, Menlo Park, CA 94025, USA.
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MeSH Terms
Environmental Monitoring
Food Chain
Fresh Water
Mollusca / metabolism*
San Francisco
Selenium / analysis*,  toxicity
Water Pollutants, Chemical / analysis*
Reg. No./Substance:
0/Water Pollutants, Chemical; 7782-49-2/Selenium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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