At-Risk Science Coordinator
Email:
david_jones-farrand@fws.gov
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Stream hydrology and temperature are among the most influential regulators of life-history traits and community structure of aquatic organisms. Hydrologic and thermal gradients strongly affect individual fitness and ultimately species success by imposing fundamental constraints on behavior, metabolic rates, reproduction, growth and ecological interactions. Stream hydrology and water temperature are also among the most frequently altered components of lotic systems due to human activities and other environmental disturbance. Despite their critical role in sustaining native aquatic biodiversity, few studies have examined the cross-scale influence of hydrology and water temperature on freshwater biota using a multi-species...
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The Species Index for aquatic ecosystems is based on ranges of aquatic and amphibious species pulled from a list of 398 U.S. FWS Trust Species. Area of Influence (AOI) range maps for each species were pulled from the USFWS’ Information for Planning and Consultation (IPaC) system, stacked, and summarized within 5-mile hexagons. The resulting layer was then clipped to the Middle South subregion boundary and filtered to floodplain habitats. Continuous data is classified into 4 classes: 0 = N/A (Uplands) 1 = No suspected presence of these Trust Species 2 = 0-90th percentile of hexagons 3 = Top 10% of hexagons
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Ratio of cell CVI values to Max CVI combined from Terrestrial & Aquatic CVI Ration maps. Data sets were combined using a Max function: MAX(CVI_t, CVI_a).
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The Risk Index for aquatic ecosystems is based on the risk of land use change from urbanization or sea-level rise (SLR). Urbanization risk is calculated and classified based on past change (from 2001 NLCD to 2016 NLCD) and expected future changes (Southeast SLEUTH model). Expected changes from SLR are included in the future change expectations with urbanization (either/or) where appropriate. Risk is classified into 5 classes: 0 = Uplands (out of analysis) 1 = High Risk (Past = declines and Future =declines) 2 = Moderate Risk (Past = stable or increasing & Future = declines) 3 = Low Risk (Past = declines & Future = stable) 4 = Very Low Risk (Past = stable or increasing & Future = stable).
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Ratio of the Conservation Value Index score calculated for each pixel to the maximum possible CVI score (144) for aquatic systems.
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