Document Detail

Habitat specialization and the exploitation of allochthonous carbon by zooplankton.
MedLine Citation:
PMID:  17168024     Owner:  NLM     Status:  MEDLINE    
The significance of spatial subsidies depends on consumer resource interactions in the recipient habitat. Lakes are subsidized by terrestrial carbon sources, but the pathways of allochthonous carbon through lake food webs are complex and not well understood. Zooplankton vertically partition resources within stratified lakes in response to life history trade-offs that are governed by predators, the quantity and quality of food, and abiotic conditions (e.g., UV, temperature, and viscosity). We measured habitat specialization of zooplankton in an oligotrophic lake where allochthonous and autochthonous resources varied with depth. During stratification, the quantity and quality of zooplankton food was highest in the hypolimnion. We used a yearlong time series of the delta13C of zooplankton and particulate organic matter (POM) to determine which zooplankton species exploited hypolimnetic rather than epilimnetic resources. Because the delta13C of POM decreased with depth, we used the delta13C of zooplankton to detect inter- and intraspecific variation in habitat selection. We incubated Daphnia pulex at discrete depths in the water column to confirm that the delta13C of zooplankton can indicate habitat specialization. Zooplankton that specialized in the epilimnion relied more on allochthonous carbon sources than those that specialized in the hypolimnion. Therefore, the fate of allochthonous carbon subsidies to lakes depends on spatially explicit consumer-resource interactions.
Blake Matthews; Asit Mazumder
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ecology     Volume:  87     ISSN:  0012-9658     ISO Abbreviation:  Ecology     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-12-15     Completed Date:  2008-06-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043541     Medline TA:  Ecology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2800-12     Citation Subset:  IM    
Water and Aquatic Sciences Research Program, Department of Biology, University of Victoria, P.O. Box 3020 STN CSC Victoria, British Columbia V8N 3N5, Canada.
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MeSH Terms
Analysis of Variance
Body Size / physiology
British Columbia
Carbon / analysis,  metabolism*
Carbon Isotopes / analysis
Chlorophyll / analysis
Daphnia / chemistry,  metabolism*
Fresh Water / analysis
Least-Squares Analysis
Population Density
Time Factors
Zooplankton / metabolism*
Reg. No./Substance:
0/Carbon Isotopes; 1406-65-1/Chlorophyll; 479-61-8/chlorophyll a; 7440-44-0/Carbon

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

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