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Impacts of Barriers on Topeka Shiner Metapopulations

项目名称：	Impacts of Barriers on Topeka Shiner Metapopulations
摘要：	The Topeka shiner was listed as endangered in 1999 due to an estimated 80% reduction of occurrence throughout its historical range. At the time current information on the distribution of this fish was lacking in South Dakota. Recent studies have found that the Topeka shiner is extant throughout its historical range in South Dakota but population trends are not known. Numerous barriers to fish movement in the Big Sioux River, Vermillion River, and James River watersheds may increase the vulnerability of Topeka shiner metapopulations to local extinction. The extent that metapopulation viability has been reduced is not known. Although the Department of Transportation has been proactive in modifying culvert designs and changing construction practices to minimize future impacts to Topeka Shiner habitat, many existing drainage structures may act as permanent or intermittent barriers to movement. Research is needed to gather information on which drainage structures constitute barriers, examine population distributions and genetic diversity above and below selected drainage structures, characterize the effectiveness of current culvert design in minimizing interference with movement and assess potential mitigation strategies for existing culverts. This information will allow refinement of mitigation requirements to appropriate levels while insuring the best use of limited funding for both state and local governments. The objectives of this research project is to: (1) determine if various culvert types, designs, and in-place characteristics are acting as intermittent or permanent barriers to movement of the Topeka shiner; (2) clarify the effects of culvert types, designs and flow characteristics on Topeka shiner movement through and distribution above and below culverts; and (3) develop strategies for mitigating existing culverts and improving new culvert designs to allow fish passage.
状态：	Proposed
资金：	120000.00
资助组织：	South Dakota Department of Transportation
项目负责人：	Johnston, Dan
开始时间：	20091231
主题领域：	Bridges and other structures；Data and Information Technology；Hydraulics and Hydrology；Marine Transportation；I15: Environment