Document Detail

Regime shift signatures from stable oxygen isotopic records of otoliths of Atlantic cod (Gadus morhua).
MedLine Citation:
PMID:  12725428     Owner:  NLM     Status:  MEDLINE    
The sudden collapse of Atlantic cod (Gadus morhua) may relate to ocean climate, or regime shifts as demonstrated in production of Pacific salmon. This paper reports the results of stable oxygen isotope ratio analyses (18O/16O or delta18OA) from 91 otoliths of cod over a period of about 20 years. Seasonal delta18OA variations of individual otoliths started at an initial value of about -0.5 to 0 per thousand VPDB, and then reached a stable level in the range of +2.5 to +3.5 per thousand VPDB after 4-5 years. The initial low values correspond to the natal sources of mature cod, while the higher delta18OA values represent the water conditions before the cod was caught. This pattern of delta18OA variation was observed over the life history of all cod examined. Furthermore, the calculated isotopic temperatures agreed with those obtained from summer bottom trawl survey, indicating that delta18OA of otoliths could be used as a thermometer in determining the ambient seawater temperature where the cod lived. Comparison of long-term delta18OA records and biological and meteorological observations suggested that decadal-scale ecosystem changes did occur in the late 1970s and early 1990s in Atlantic Canada, comparable to regime shifts occurred in the North Pacific.
Y W Gao
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Isotopes in environmental and health studies     Volume:  38     ISSN:  1025-6016     ISO Abbreviation:  Isotopes Environ Health Stud     Publication Date:  2002 Dec 
Date Detail:
Created Date:  2003-05-02     Completed Date:  2003-05-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9602611     Medline TA:  Isotopes Environ Health Stud     Country:  England    
Other Details:
Languages:  eng     Pagination:  251-63     Citation Subset:  IM    
Makah Fisheries Management, P.O. Box 115, Neah Bay, Washington 98357, USA.
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MeSH Terms
Oxygen Isotopes / analysis
Population Dynamics
Skin / chemistry*
Reg. No./Substance:
0/Oxygen Isotopes

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

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