AbstractLinking Fish-Population Characteristics with Habitat Structure using GISTrack: Forestry, Wildlife, and Fisheries Management Author Closure of Glen Canyon Dam in 1963 significantly altered the physical processes and environments of the Colorado River in Grand Canyon. This has affected the aquatic food web and the native and non-native fish communities. As the designative science provider to the Glen Canyon Dam Adaptive Management Program, the Grand Canyon Monitoring and Research Center (GCMRC) is actively investigating habitat requirements of native fishes and the relationships of these habitats to dam operations. Here, we present preliminary results showing some relationships between the physical characteristics of native-fish populations and their spatial distributions in respect to the geometry of the habitats that they occupy. These results are based on several large fish-sampling expeditions where samples were stratified based on automated classifications of shoreline habitat derived from digital, airborne imagery within a GIS environment. Michael Breedlove U.S. Geological Survey 2255 N. Gemini Dr. Bldg. 4 - Rm 418 Flagstaff, Arizona 86001 United States Phone: 928-556-7344 E-mail: mbreedlove@usgs.gov Michael Yard U.S. Geological Survey 2255 N. Gemini Drive Flagstaff, Arizona 86001 United States Phone: 928-556-7377 E-mail: myard@usgs.gov |