Document Detail


Delayed upwelling alters nearshore coastal ocean ecosystems in the northern California current.
MedLine Citation:
PMID:  17360419     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Wind-driven coastal ocean upwelling supplies nutrients to the euphotic zone near the coast. Nutrients fuel the growth of phytoplankton, the base of a very productive coastal marine ecosystem [Pauly D, Christensen V (1995) Nature 374:255-257]. Because nutrient supply and phytoplankton biomass in shelf waters are highly sensitive to variation in upwelling-driven circulation, shifts in the timing and strength of upwelling may alter basic nutrient and carbon fluxes through marine food webs. We show how a 1-month delay in the 2005 spring transition to upwelling-favorable wind stress in the northern California Current Large Marine Ecosystem resulted in numerous anomalies: warm water, low nutrient levels, low primary productivity, and an unprecedented low recruitment of rocky intertidal organisms. The delay was associated with 20- to 40-day wind oscillations accompanying a southward shift of the jet stream. Early in the upwelling season (May-July) off Oregon, the cumulative upwelling-favorable wind stress was the lowest in 20 years, nearshore surface waters averaged 2 degrees C warmer than normal, surf-zone chlorophyll-a and nutrients were 50% and 30% less than normal, respectively, and densities of recruits of mussels and barnacles were reduced by 83% and 66%, respectively. Delayed early-season upwelling and stronger late-season upwelling are consistent with predictions of the influence of global warming on coastal upwelling regions.
Authors:
John A Barth; Bruce A Menge; Jane Lubchenco; Francis Chan; John M Bane; Anthony R Kirincich; Margaret A McManus; Karina J Nielsen; Stephen D Pierce; Libe Washburn
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2007-02-27
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  104     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-03-15     Completed Date:  2007-04-24     Revised Date:  2010-09-15    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3719-24     Citation Subset:  IM    
Affiliation:
College of Oceanic and Atmospheric Sciences and Department of Zoology, Oregon State University, Corvallis, OR 97331, USA. barth@coas.oregonstate.edu
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MeSH Terms
Descriptor/Qualifier:
Animals
Biomass
California
Carbon / metabolism
Chlorophyll / chemistry
Ecology
Ecosystem*
Food Chain
Marine Biology / methods*
Mytilus
Oceans and Seas
Oregon
Phytoplankton
Temperature
Thoracica
Chemical
Reg. No./Substance:
1406-65-1/Chlorophyll; 479-61-8/chlorophyll a; 7440-44-0/Carbon
Comments/Corrections

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


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