HR: 10:45h
AN: NB32B-02    [Abstracts]
TI: Influence of Thermal Regime on Mayfly Assemblages in Mountain Streams
AU: * Gustafson, M P
EM: mgustafson@tlu.edu
AF: Department of Biology, Texas Lutheran University, 1000 W Court Street, Seguin, TX 78155 United States
AB: Theory predicts that thermal regime is an important factor regulating aquatic insect assemblages. Small affordable temperature loggers now make possible accurate measurements of thermal regime throughout a river basin. I measured the summer thermal regime at stream sites in the Sawtooth Mountains of Idaho and collected quantitative samples of benthic macroinvertebrates at the same sites. Sites were chosen below lakes as well as in streams without lakes to increase the variation in thermal regimes. Ordination and multiple regression were used to explain the variation in mayfly assemblages. Maximum temperature explained the largest percentage of the variation in assemblages.
DE: 1845 Limnology
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly