Document Detail

Crassostrea virginica grazing on toxic and non-toxic diatoms.
MedLine Citation:
PMID:  19835902     Owner:  NLM     Status:  MEDLINE    
Despite high abundances of toxic Pseudo-nitzschia spp. over Louisiana oyster beds (Crassostrea virginica; eastern oyster) there have been no documented cases of amnesic shellfish poisoning (ASP) in the state. Two possible explanations are that oysters do not readily feed on long pointed chains of Pseudo-nitzschia cells or they discriminate against toxic cells while grazing. To test these hypotheses, short-term grazing experiments were conducted with several diatoms, including the domoic acid (DA)-producing Pseudo-nitzschia multiseries (1.31+/-0.057 pg DA cell(-1)) and the non-toxic Pseudo-nitzschia delicatissima, Thalassiosira weissflogii, and Ditylum brightwellii. Grazing rates on the small centric species T. weissflogii were significantly higher than on the larger and pointier D. brightwellii and either Pseudo-nitzschia species. Grazing on toxic P. multiseries and non-toxic P. delicatissima was not significantly different. Pseudofeces production was higher and feces production was occasionally lower in oysters fed Pseudo-nitzschia spp. than in oysters fed the other two diatoms. Our data demonstrate lower filtration rates of C. virginica on Pseudo-nitzschia spp. relative to the other diatoms tested and comparable filtration on toxic and non-toxic Pseudo-nitzschia spp. These findings suggest that eastern oysters do not discriminate amongst food types due to DA content.
A E Thessen; T M Soniat; Q Dortch; G J Doucette
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-10-14
Journal Detail:
Title:  Toxicon : official journal of the International Society on Toxinology     Volume:  55     ISSN:  1879-3150     ISO Abbreviation:  Toxicon     Publication Date:    2010 Feb-Mar
Date Detail:
Created Date:  2010-01-29     Completed Date:  2010-04-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1307333     Medline TA:  Toxicon     Country:  England    
Other Details:
Languages:  eng     Pagination:  570-9     Citation Subset:  IM    
Copyright Information:
Copyright 2009 Elsevier Ltd. All rights reserved.
Louisiana Universities Marine Consortium, 8124 Highway 56, Cocodrie, LA 70344, USA.
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MeSH Terms
Crassostrea / physiology*
Diatoms / chemistry*,  ultrastructure
Feces / chemistry
Feeding Behavior*
Foodborne Diseases / epidemiology
Kainic Acid / analogs & derivatives,  chemistry
Marine Toxins / chemistry*,  pharmacokinetics
Metabolic Clearance Rate
Neurotoxins / chemistry
Risk Assessment
Reg. No./Substance:
0/Marine Toxins; 0/Neurotoxins; 14277-97-5/domoic acid; 487-79-6/Kainic Acid

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

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