3:15 SCALE OF HYDRAULIC VARIABILITY AND BENTHIC COMMUNITY STRUCTURE; COLORADO RIVER THROUGH GRAND CANYON, ARIZONA.
J.P. Shannon, G.A. Haden, E.P. Benenati, K.P. Wilson, and D.W. Blinn. Department of Biological Sciences, Northern Arizona University, PO BOX 5640,Flagstaff, AZ, 86011

3:30 BENTHIC COMMUNITY COMPOSITION AND STANDING MASS IN THE COLORADO RIVER ABOVE AND BELOW GLEN CANYON DAM, ARIZONA, USA.
G.A. Haden, J.P. Shannon, K.P. Wilson, and D.W. Blinn. Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, USA 86011

3:45 INVERTEBRATE STRUCTURE AND COMPOSITION BELOW LARGE DAMS AND IN UNREGULATED TRIBUTARIES (RIVER LIMA CATCHMENT _NW PORTUGAL).
R. Cortes¹ and T. Ferreira². ¹Depart. Florestal, UTAD, Apart. 202, 5000-102 Vila Real, Portugal, ²Depart. Florestal, Instituto Superior de Agronomia, Tapada da Ajuda, 1399 Lisboa Codex, Portugal

4:00 EFFECTS OF VARIOUS CHANNEL CONSTRUCTIONS ON BENTHIC COMMUNITIES IN A REGULATED MOUNTAIN STREAM (SOUTHERN POLAND).
T.M. Fleituch. Karol Starmach Institute of Freshwater Biology, Polish Academy of Sciences, 31-016 Krakow, ul. Slawkowska 17, Poland

4:15 THE INFLUENCE OF TEMPERATURE CHANGES ON FISH AND MACROINVERTEBRATES BELOW DAMS IN MICHIGAN.
J.L. Lessard¹, D.B. Hayes¹, and R.W. Merritt². ¹Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI, USA 48824-1222, ²Department of Entomology and Fisheries and Wildlife, Michigan State University, East Lansing, MI, USA 48824-1115

4:30 EFFECTS OF HYDROLOGIC ALTERATION ON FLOODPLAIN COMMUNITIES OF THE UPPER CONNECTICUT RIVER.
K.H. Nislow¹, F.J. Magilligan², D. Bechtel³, and A. Ruesink⁴. ¹USDA-US Forest Service, Northeast Research Station, Amherst, MA 01003, ²Department of Geography, Dartmouth College, Hanover, NH 03755, ³The Nature Conservancy, Concord, NH 03301, ⁴The Nature Conservancy, Montpelier, VT 05602

4:45 ESTIMATING WATER DEPLETION FOR A RIVER REACH IN A REGION WITH A SEMI-ARID CLIMATE.
C.N. Dahm, M.C. Molles, Jr., J.R. Cleverly, J.R. Thibault, and C.S. Crawford. Department of Biology, University of New Mexico, Albuquerque, NM 87131-1091, USA

5:00 INDICATORS OF HYDROLOGIC ALTERATIONS IN RESPONSE TO A CHANGING CLIMATE.
J.L. Meyer¹, C.A. Gibson¹, N.L. Poff², A.P. Georgakakos³, and L.E. Hay⁴. ¹Institute of Ecology, University of Georgia, Athens GA 30602, ²Biology Department, Colorado State University, Fort Collins CO 80523, ³Water Resources Institute, Georgia Institute of Technology, Atlanta GA, ⁴Water Resources Division, U.S. Geological Survey, Denver Federal Center CO 80225