10:15 GRAZER INTERACTIONS IN A TROPICAL LOWLAND STREAM.
N.C. Barbee. Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, USA 93106

10:30 DIFFERING BEHAVIORAL RESPONSES OF TWO FRESHWATER GASTROPODS TO PUMPKINSEED SUNFISH, LEPOMIS GIBBOSUS.
C. Boes and A. Turner. Department of Biology, Clarion University of Pennsylvania, Clarion, PA 16214

10:45 PREDATION ON EXOTIC ZEBRA MUSSELS BY FISHES: EFFECTS ON PREDATOR AND PREY.
D.D. Magoulick¹ and L.C. Lewis^1,2. ¹Department of Biology, University of Central Arkansas, Conway, Arkansas 72035, ²FTN Associates, Ltd., #3 Innwood Circle, Suite 220, Little Rock, Arkansas 72211

11:00 LITTORAL MACROINVERTEBRATE COMMUNITY COMPOSITION AND SPECIES INTERACTIONS IN ARCTIC LTER LAKES WITH AND WITHOUT FISH.
A.I. Wilson¹, A.E. Hershey¹, and T. Peterson². ¹Department of Biology, University of North Carolina Greensboro, Greensboro, NC 27402, ²Department of Biology, Appalachian State University, Boone, NC 28608

11:15 THE STABLE-ISOTOPE RELATIONSHIP BETWEEN A SCRAPER-GRAZER, GLOSSOSOMA NIGRIOR (GLOSSOSOMATIDAE:TRICHOPTERA), AND ITS ALGAL DIET.
R.R. Doucett¹, D.J. Giberson², G. Power¹, and R.A. Cunjak³. ¹Department of Biology, University of Waterloo, 200 University Ave., Waterloo, ON, Canada, N2L 3G1, ²Department of Biology, University of Prince Edward Island, 550 University Ave., Charlottetown, PEI, Canada, C1A 4P3, ³Department of Biology, University of New Brunswick, Bag Service 45111, Fredericton, NB, Canada, E3B 6E1

11:30 TEMPORAL CHANGES IN THE DIETS OF LARVAL NET-WINGED MIDGES (DIPTERA: BLEPHARICERIDAE: BLEPHARICERA) FROM GREAT SMOKY MOUNTAIN NATIONAL PARK, NORTH CAROLINA.
A.J. Alverson and G.W. Courtney. Department of Entomology, Iowa State University, Ames, Iowa, USA 50011

11:45 THE RESPONSE OF ALGAE AND INVERTEBRATES TO WATER LEVEL VARIATIONS IN A QUEBEC STREAM.
A. Cattaneo and L. Cloutier. Département de sciences biologiques, Université de Montréal, Québec, Canada H3C 3J7