1:30 SPATIAL VARIABILITY OF DISTRIBUTIONS OF LARVAL HYDROPSYCHID CADDISFLIES IN NORTHERN MICHIGAN STREAMS.
M.P. Fairchild^1,2 and J.R. Holomuzki^1,2. ¹Department of Evolution, Ecology, and Organismal Biology, 1735 Neil Avenue, The Ohio State University, Columbus, OH 43210, ²University of Michigan Biological Station, 9008 Biological Rd., Pellston, MI 49769

1:45 TRADE-OFF STRATEGIES BETWEEN CASE CONSTRUCTION, LARVAL MOVEMENT, AND CURRENT RESISTANCE IN COEXISTING TRICHOPTERAN SCRAPERS.
G. Becker. Limnologische Fluss-Station des Max-Planck-Instituts fuer Limnologie, P.O. Box 260, D-36105 Schlitz, Germany

2:00 SPATIAL DYNAMICS OF A LEKANESPHAERA MONODI (ARCANGELI) POPULATION AMONG RESOURCE PATCHES.
A. Basset and L. Tafuro. Dipartimento di Biologia, Università di Lecce, Lecce, 73100 Italia

2:15 DOES AN OBLIGATE COMMENSAL FIT PREDICTIONS OF A STABLE SYMBIOSIS?: AN EXAMINATION OF MIDGE/HOST DYNAMICS IN SOUTHERN MAINE STREAMS.
C.M. Pennuto¹, C. Wooster-Brown¹, and C.L. Belisle². ¹Environmental Science & Policy Program, University of Southern Maine, Gorham, ME 04038, ²Department of Biological Sciences, University of Maine, Orono, Orono, ME 04469

2:30 MUTUALISTIC ASSOCIATIONS OF BRANCHIOBDELLIDS AND THEIR CRAYFISH HOSTS: EVIDENCE OF A FRESHWATER CLEANING SYMBIOSIS.
B.L. Brown¹, W.E. Dobson², and R.P. Creed². ¹Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, ²Department of Biology, Appalachian State University, Boone, NC 28608

2:45 MACROHABITAT PARTITIONING AMONG THREE CRAYFISH SPECIES IN TWO OZARKS STREAMS, MISSOURI, U.S.A.
R.J. DiStefano¹ and C.M. Gale². ¹Missouri Department of Conservation, Conservation Research Center, 1110 College Ave., Columbia, MO 65201, ²Marshfield Clinic - ML2, Marshfield, WI 54449