Document Detail


Impacts of marine-derived nutrients on stream ecosystem functioning.
MedLine Citation:
PMID:  14561274     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Energy and nutrient subsidies transported across ecosystem boundaries are increasingly appreciated as key drivers of consumer-resource dynamics. As purveyors of pulsed marine-derived nutrients (MDN), spawning salmon are one such cross-ecosystem subsidy to freshwaters connected to the north Pacific. We examined how salmon carcasses influenced detrital processing in an oligotrophic stream. Experimental manipulations of MDN inputs revealed that salmon carcasses indirectly reduced detrital processing in streams through temporarily decoupling the detrital resource-consumer relationship, in which detrital consumers shifted their diet to the high-nutrient resource, i.e. salmon carcasses. The average decomposition rate of alder leaves with salmon carcass addition was significantly lower than that without the carcass, which was associated with lower abundance and biomass of detritivorous Trichoptera on the carcass-treated leaves. There were generally larger in size Trichopteran detritivores on the carcasses than on leaves. These results imply that cross-boundary MDN subsidies indirectly retard the ecosystem processing of leaf litter within the short term, but may enhance those food-limited detritivorous consumers. Because unproductive freshwaters in the Pacific northwest are highly dependent upon the organic matter inputs from surrounding forests, this novel finding has implications for determining conservation and management strategies of salmon-related aquatic ecosystems, in terms of salmon habitat protection and fisheries exploitation.
Authors:
Yixin Zhang; Junjiro N Negishi; John S Richardson; Renata Kolodziejczyk
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  270     ISSN:  0962-8452     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2003 Oct 
Date Detail:
Created Date:  2003-10-16     Completed Date:  2003-11-20     Revised Date:  2010-09-21    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  2117-23     Citation Subset:  IM    
Affiliation:
Centre for Applied Conservation Research and Department of Forest Sciences, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. yixin@interchange.ubc.ca
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animal Nutritional Physiological Phenomena*
Animals
Biodegradation, Environmental*
Ecosystem*
Fresh Water / chemistry*
Insects / physiology
Pacific Ocean
Pacific States
Plant Leaves / chemistry
Salmon / metabolism
Seawater / chemistry*
Comments/Corrections

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