1:00 THE RELEVANCE OF HIERARCHICAL COMMUNITY STRUCTURE TO STREAM BIOASSESSMENTS WITH BENTHIC MACROINVERTEBRATES.
I.K. Ciesielka and R.C. Bailey. Department of Zoology, University of Western Ontario, London, Ontario, Canada N6A 5B7

1:15 MIXED MESSAGES: DECISION-MAKING IN BIOASSESSMENTS BASED ON MULTIPLE TEST RESULTS.
R.C. Bailey. Department of Zoology, The University of Western Ontario, London, Ontario, Canada N6A 5B7

1:30 COMPARISONS OF ECOLOGICAL COMMUNITIES: THE PROBLEM OF SAMPLE REPRESENTATIVENESS.
Y. Cao¹, D.D. Williams², and D. Larsen¹. ¹Western Ecology Division, US-EPA NHEERL, 200 SW 35th Street, Corvallis, OR 97333, ²Division of Life Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, ON Canada M1C 1A4

1:45 BACTERIAL PROCESSES IN ROCKY MOUNTAIN STREAMS AFFECTED BY MINE DRAINAGE.
D.K. Niyogi^1,2, W.M. Lewis, Jr.¹, and D.M. McKnight². ¹Center for Limnology, CIRES, University of Colorado, Boulder, CO 80309-0216, ²INSTAAR, University of Colorado, Boulder, CO 80309-0450

2:00 RECIPROCAL TRANSPLANT EXPERIMENTS TO DETERMINE THE RESISTANCE AND RESILIENCE OF BENTHIC MACROINVERTEBRATE COMMUNITIES IN YUKON STREAMS.
R. Taylor and R. Bailey. Department of Zoology, The University of Western Ontario, London, Ontario, Canada N6A 5B7

2:15 ENERGETIC FOOD WEBS AND TROPHIC STRUCTURE OF METAL-POLLUTED COLORADO STREAMS.
D.M. Carlisle and W.H. Clements. Department of Fishery and Wildlife Biology, Colorado State University, Ft. Collins, CO 80523 USA

2:30 PERIPHYTON AND INVERTEBRATES AS INDICATORS OF METAL CONTAMINATION IN A COBBLE BOTTOM RIVER.
C.S. Harris¹ and L. Bendell-Young². ¹AGRA Earth and Environmental Ltd. 4810 - 93 Street, Edmonton, Alberta, Canada, T6E 5M4, ²Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada, V5A 1S6

2:45 A NOVEL TRIAD APPROACH TO ASSESSING POLLUTION INDUCED DEGRADATION IN HIGH-GRADIENT STREAMS.
K.M. Neptun¹, W.H. Clements¹, and W. Stubblefield². ¹Fishery and Wildlife Biology, Colorado State University, Fort Collins, CO 80523, ²ENSR Corporation, 4303 West LaPorte Ave., Fort Collins, CO 80521