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Layer: eDNA Field Collection Sites (<10% slope) (0)

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Description: Environmental DNA (eDNA) sampling results of bull trout at specific locations throughout their distribution range. More information - https://www.fs.usda.gov/rm/boise/AWAE/projects/BullTrout_eDNA.html The bull trout is an ESA-listed species with a historical range that encompasses many waters across the Northwest. Though once abundant, bull trout have declined in many locations and are at risk from a changing climate, nonnative species, and habitat degradation. Informed conservation planning relies on sound and precise information about the distribution of bull trout in thousands of streams, but gathering this information is a daunting and expensive task. To help overcome this problem, we coupled 1) predictions from the range-wide, spatially precise Climate Shield model on the location of natal habitats of bull trout with 2) a sampling template for every 8-digit hydrologic unit in the historical range of bull trout, based on the probability of detecting bull trout presence using environmental DNA (eDNA) sampling (McKelvey et al. 2016). The template consists of a master set of geospatially referenced sampling locations at 1-km intervals within each cold-water habitat. We also identified sampling locations at this same interval based on the USFWS's designation of critical spawning and rearing habitat. Based on field tests of eDNA detection probabilities conducted by the National Genomics Center for Wildlife and Fish Conservation, this sampling approach will reliably determine the presence of populations of bull trout, as well as provide insights on non-spawning habitats used by adult and subadult fish. The result is a rapid, robust, and repeatable range-wide assessment of natal habitats of bull trout. These sample locations available in this map and eDNA results are provided to help managers as well as guide those who would like to participate in collecting samples in the future.

Copyright Text: Rocky Mountain Research Station – Air, Water, & Aquatic Environments

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