Open-File Report 2007-1125
U.S. GEOLOGICAL SURVEY
Open-File Report 2007-1125
Biological surveys are needed to better understand the aquatic ecosystem of the Lower Crooked River. Surveys of aquatic habitat have been conducted for the BLM, but fish surveys using electrofishing gear have never been conducted in the isolated 11-mile section of the Crooked River Gorge, and visual observations with mask and snorkel have only been made at isolated point locations where hiking trails provide access to the river; thus, there is a poor understanding of stream fish presence and distribution throughout Lower Crooked River. The goal of this project was to examine longitudinal patterns in fish assemblages, aquatic habitat, and water temperature in the Lower Crooked River during summer conditions. Specific objectives were to (1) characterize the spatial distribution of native and non-native fishes, (2) describe variation in channel morphology, substrate composition, and water temperature, and (3) evaluate the associations between fishes, aquatic habitat, and water temperature.
This report is available online in Portable Document Format (PDF). If you do not have the Adobe Adobe PDF Reader, it is available for free download from Adobe Systems Incorporated.
Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired. This information provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by a number of common screen-reading programs that synthesize text as audible speech. In addition, an accessible version of Acrobat Reader 8.0 for Windows (English only), which contains support for screen readers, is available. These tools and the accessible reader may be obtained free from Adobe at Adobe Access.
Send questions or comments about this report to the authors, Christian E. Torgersen, (541)758-7797 David P. Hockman-Wert, (541)758-8755 Douglas S. Bateman, (541)737-7784. David W. Leer, (541)750-7433 Robert E. Gresswell, (541)750-7410.
For more information, visit the Forest and Rangeland Ecosystem Science Center home page.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://pubs.usgs.gov/ofr/2007/1125
Page Contact Information: Publications Team
Page Last Modified: Friday, 03-Aug-2007 14:06:32 EDT
