HR: 13:30h
AN: NB23A-01    [Abstracts]
TI: Basin Scale Evaluation of Stream Invertebrate Community Functional Organization
AU: * Cummins, K W
EM: kwc7002@humboldt.edu
AF: Institute for River Ecosystems, Humboldt State University 592 14th Street, Arcata, CA 95521 United States
AU: Matousek, J
EM: jjm31@humboldt.edu
AF: Institute for River Ecosystems, Humboldt State University 592 14th Street, Arcata, CA 95521 United States
AU: Shackelford, A J
EM: ajs37@humboldt.edu
AF: Institute for River Ecosystems, Humboldt State University 592 14th Street, Arcata, CA 95521 United States
AB: Invertebrate community functional organization was studied at the basin scale in the Freshwater Creek catchment in northern California in August and September, 2004. Timed, D-frame net samples were taken in six tributaries (study reaches 0.5 - 2.7 km) and two sections of the mainstem (3.4 and 4.5 km) of Freshwater Creek. The 317 samples from 106 sites were collected by habitat (cobble, 167; riparian litter, 82; fine sediments, 36; large woody debris, 32). The sample sites matched randomly selected locations within a sample frame of a concomitant juvenile salmonid survey. Juvenile salmonid stomach samples were also taken at each invertebrate survey site. Shredders and total collectors each dominated one tributary and one mainstem reach and scrapers dominated four tributaries. Using the invertebrate ecosystem surrogate method developed by Cummins and Merritt, half of the tributaries/mainstem reaches were characterized as heterotrophic, the other half as autotrophic. The invertebrate functional group community organization was strongly correlated with habitat type but, in general, the relationship with salmonid abundance was indirect. Initial analysis of juvenile salmonid stomachs from one stream (Cloney Gulch) indicated that food availability was good for drift-feeding fish.
DE: 9800 GENERAL OR MISCELLANEOUS
SC: North American Benthological Society [NB]
MN: 2005 Joint Assembly