Tibbets, T. M. Arizona State University, teresat@asu.edu
Elser, J. M. Arizona State University,

 
ECOLOGICAL STOICHIOMETRY OF CONSUMERS AND RESOURCES IN ARCTIC AND TEMPERATE STREAMS
 
Nearly all previous research on ecological stoichiometry has been performed in marine and lake ecosystems and little is known about the potential role of ecological stoichiometry in stream ecosystems. To begin to address this lack of data we determined the elemental composition (C:N:P) of stream invertebrates (both for individual taxa and for mixed community samples) and their potential food sources (algae, FPOM, and CPOM) for 10 streams in northern Wisconsin and Michigan and 10 streams in arctic Alaska. The P content of specific invertebrate taxa exhibited a similar range to that previously documented for crustacean zooplankton in lakes. At the community / guild level, the C:P of invertebrate communities in arctic streams was somewhat lower relative to temperate invertebrate communities. The C:P of stream CPOM was extremely high in both Alaska and Wisconsin, suggesting the possibility of P limitation of detritivorous consumers similar to that now established for fresh water zooplankton.
 
Day: Tuesday, Feb. 2
Time: 04:30 - 04:45pm
Location: Sweeney Center
 
Code: SS49TU0430S