аЯрЁБс>ўџ 35ўџџџ2џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџьЅС%` №П]bjbj"x"x .@@] џџџџџџЄЄЄЄЄЄЄЄИИђ44444   —™™™™™™$ hrоНЄя   я я НЄЄ44лв;;;я Є4Є4—;я —;;ЄЄ;4( Рr|жqЩљ ";—ш0;PP;PЄ;\ :I р;) Дн    НН1    я я я я ИИИdфИИИИИИЄЄЄЄЄЄџџџџ  Influence of flow regime on life-history structure of stream fish assemblages, upper Missouri River basin, USA Valerie Kelly, U.S. Geological Survey Abstract: It is widely recognized that streamflow regime provides a critical adaptive template to which species life-histories must be well adapted for the species to be successful. This analysis evaluates how life-history traits of species in stream fish assemblages co-vary across a gradient of flow regime in the upper Missouri River Basin. The following questions are addressed: Do species tend to cluster together with similar life-history strategies, or do a wide range of life-history strategies coexist? Do these patterns differ along a regional gradient of streamflow regime? What is the effect of stream size? Preliminary results indicate that dominant traits within assemblages can be organized along a significant life-history gradient defined by age and length of maturity as well as longevity. This gradient is roughly associated with elevation and stream size, although some non-intuitive results are observed for large streams. Streamflow variability appears to provide an important constraint on the distribution of colonizer species, although not for classic K-selected species. The analysis is ongoing. Person completing this form: Valerie Kelly Today’s Date: March 18, 2008 Project date and duration: Ongoing Project collaborators: Valerie Kelly U.S. Geological Survey (USGS) U.S. Environmental Protection Agency (EPA) Study area: Approximately 750,000 square kilometers, including (potentially) all tributary streams to the upper Missouri River--including South Dakota, most of North Dakota, more than half of Montana, and about a third of Wyoming, USA. The streams were selected randomly as part of the EMAP probabilistic survey protocol. Aim/Purpose: Support EPA interpretation of data from their Environmental Monitoring and Assessment Program (EMAP) Specific Activities: Develop method to quantify streamflow regime for ungaged sites; develop database of life-history attributes; multivariate analysis of relationships Data used: EMAP data, USGS streamflow data, life-history data from literature Data generated: Metrics of flow regime for EMAP sites Results: Streamflow regime classification. Predictive model of selected life-history characteristics based on climate, topography, and streamflow variability. Products: Methodology for estimating flow metrics for ungaged sites. Dissertation, Oregon State University. Management and Policy application: Uncertain. Monitoring: Not applicable. 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