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Biodiversity Hotspots and the UTRB
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Map depicting biodiversity hotspots in the eastern United States along with the boundary of the Upper Tennessee River Basin and USFWS National Wildlife Refuge locations.
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Maps
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Map of Federally Listed Aquatic Species in Virginia Portion of UTRB
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Map depicting listed and candidate aquatic species in the Upper Tennessee hydrologic sub-unit of Virginia.
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Maps
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Map of Federally Listed Species within the UTRB in Tennessee
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Map of Listed and candidate aquatic species in the Upper Tennessee hydrologic sub-unit of Tennessee.
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Maps
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Map of Federally Listed Species within the UTRB in North Carolina
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Map of Listed and candidate aquatic species in the Upper Tennessee hydrologic sub-unit of North Carolina.
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Maps
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Map of Listed, Proposed, and Candidate Fish in the UTRB
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Map depicting the number of listed, proposed, and candidate fish species within each 12-digit HUC within the Upper Tennessee River Basin. Occurrences include extant and historical records. Areas within the UTRB boundary not shaded by a color denoted in the key have no records of imperiled fish species occurrences.
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Maps
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Map of Listed, Proposed, and Candidate Mussels in the UTRB
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Map depicting the number of listed, proposed, and candidate mussel species within each 12-digit HUC within the Upper Tennessee River Basin. Occurrences include extant and historical records. Areas within the UTRB boundary not shaded by a color in the key have no records of imperiled mussel species occurrences.
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Maps
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Map of Listed, Proposed, and Candidate Fish and Mussels in the UTRB
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Map depicting the number of listed, proposed, and candidate fish and mussel species within each 12-digit HUC within the Upper Tennessee River Basin. Occurrences include extant and historical records. Areas within the UTRB boundary not shaded by a color in the key have no records of imperiled fish and mussel species occurrences.
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Maps
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Population Performance Criteria to Evaluate Reintroduction and Recovery of Two Endangered Mussel Species, Epioblasma brevidens and Epioblasma capsaeformis
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Genetic and demographic modeling of two endangered mussel species, Epioblasma brevidens and E. capsaeformis, in the Clinch River, U.S.A., was conducted to determine quantitative criteria to evaluate performance of extant and reintroduced populations. Reintroduction modelling indicated that the initial population size created during a 5 year build-up phase greatly affected final population size at 25 years, being similar to the population size at the end of the build-up phase, especially when population growth rate was low. Excluding age 0 individuals, age 1 juveniles or recruits on average comprised approximately 11% and 15% of a stable population of each species, respectively. Age-class distribution of a stable or growing population was characterized by multiple cohorts, including juvenile recruits, sub-adults, and adults. Because of current barriers to dispersal and the low dispersal capability of some mussel species, reintroductions will play a prominent role in restoring populations in the United States.
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Reports & Documents
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Hydrologic Units within the Tennessee River Basin
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Unit name and total area (square miles) for 2, 4, 6, and 8 digit hydrologic units within the Tennessee River System.
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Reports & Documents
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Using a structured decision making process for strategic conservation of imperiled aquatic species in the Upper Tennessee River Basin
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Development of strategic conservation of imperiled species faces several large challenges, including uncertainty in species response to management actions, budgetary constraints that limit options, and issues with scaling expected conservation benefits from local to landscape levels and from single to multiple species. We used a structured decision making process and a multi-scale approach to identify a cost-effective conservation strategy for the imperiled aquatic species in the Upper Tennessee River Basin (UTRB), which face a variety of threats. The UTRB, which encompasses a landscape of 22,360 square miles primarily in Virginia, North Carolina, and Tennessee, harbors one of the most globally diverse assemblages of freshwater fishes and mussels occurring at temperate latitudes. In developing the strategy, we sought to identify which management actions to emphasize to best achieve recovery of imperiled aquatic species, given costs and uncertainty in management effectiveness. The strategy was developed for conservation implementation over a 20-year period, with periodic review and revision. In this presentation, we describe the ecological significance of the UTRB, the planning process, and the resulting strategy. A strategic emphasis on population management emerged as the optimal approach for achieving conservation of imperiled aquatic species in the UTRB, which aligns well with the goals of existing plans for conserving and recovering imperiled fishes and mussels in the UTRB. The structured planning process and resulting conservation strategy dovetail with the landscape approach to conservation embodied in the USFWS’s strategic habitat conservation approach and network of Landscape Conservation Cooperatives.
The recorded webinar is also available for viewing at the following link: http://www.fws.gov/northeast/science/seminars/July2015.html.
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News & Information
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Webinars and Presentations
