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
Related Documents :
24789174 - Combining bar adsorptive microextraction with capillary electrophoresis - application f...
11348064 - Global distribution of perfluorooctane sulfonate in wildlife.
6363234 - A probable case of euthanasia amongst prehistoric aborigines at roonka, south australia.
25045244 - Understanding the link between poverty and food insecurity among children: does the def...
16602284 - Long-term change in benthopelagic fish abundance in the abyssal northeast pacific ocean.
22698974 - Constructing maternal knowledge frameworks: how mothers conceptualize complementary fee...
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.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
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

Previous Document:  Species richness and stand stability in conifer forests of the Sierra Nevada.
Next Document:  Asymmetry in community regulation: effects of predators and productivity.