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The National Wildlife Refuge System (NWRS) is a network of 545 protected areas designated to manage and protect wildlife in the U.S. The 1997 NWRS Improvement Act requires the NWRS to be managed in a manner consistent with the preservation of its biological integrity, diversity, and environmental health. I used the principles of representation, redundancy, and resilience as indicators of biological integrity and diversity of 43 waterfowl species on NWRS lands. Waterfowl plays an extremely important role in the life of the American public and has been a priority conservation target for the NWRS for over 70 years. I evaluated the representation and redundancy of waterfowl species on National Wildlife Refuges (NWRs)...
To facilitate camera-based snow depth observations without additional equipment installation, we developed a novel method implemented in an R package called edger to superimpose virtual measurement devices onto images. The virtual snow stakes can be used to derive snow depth measurements. We validated the method for snow depth estimation using camera data from Latah County, Idaho, USA in winter 2020–2021. Physical snow stakes were installed in the camera viewshed with which snow depth measurements were taken. Then, virtual snow stakes were superimposed on the images using edger and images were cropped to exclude the physical snow stake so that the two snow depth measurements could be compared. This dataset contains...
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Alaska’s Wrangell-St. Elias National Park & Preserve (WRST) is expecting great increases in visitation in the near future. To help accommodate visitors, the National Park Service (NPS) is developing the Kennicott Valley as a tourist destination, and plans to build a campground there. While bear-human conflicts have been common-place in the Kennicott Valley over the years, no bear study had ever been conducted in the park. This study was initiated to quantify the nature of bear-human conflicts in the valley, describe the resident bear population, and generate management recommendations to reduce the occurrence of bear-human conflicts. We used non-invasive genetic sampling to obtain an estimate of the minimum number...


    map background search result map search result map Quantifying Bear Populations and Bear-Human Conflicts Using Non-Invasive Genetic Sampling in the Kennicott Valley of Wrangell-St. Elias National Park and Preserve Validation of the "edger" Virtual Snow Stake Validation of the "edger" Virtual Snow Stake Quantifying Bear Populations and Bear-Human Conflicts Using Non-Invasive Genetic Sampling in the Kennicott Valley of Wrangell-St. Elias National Park and Preserve