دورية أكاديمية
Population and spatial dynamics of desert bighorn sheep in Grand Canyon during an outbreak of respiratory pneumonia.
العنوان: | Population and spatial dynamics of desert bighorn sheep in Grand Canyon during an outbreak of respiratory pneumonia. |
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المؤلفون: | Epps, Clinton W., Holton, P. Brandon, Monello, Ryan J., Crowhurst, Rachel S., Gaulke, Sarah M., Janousek, William M., Creech, Tyler G., Graves, Tabitha A., Boyce, Mark S., Gazeley, Ian, Llaneza, Luis, Hudson, Peter |
المصدر: | Frontiers in Ecology & Evolution; 2024, p1-22, 22p |
مصطلحات موضوعية: | BIGHORN sheep, POPULATION dynamics, ANTHROPOGENIC effects on nature, CANYONS, GENE flow |
مصطلحات جغرافية: | GRAND Canyon National Park (Ariz.), GRAND Canyon (Ariz.) |
مستخلص: | Introduction: Terrestrial species in riverine ecosystems face unique constraints leading to diverging patterns of population structure, connectivity, and disease dynamics. Desert bighorn sheep (Ovis canadensis nelsoni) in Grand Canyon National Park, a large native population in the southwestern USA, offer a unique opportunity to evaluate population patterns and processes in a remote riverine system with ongoing anthropogenic impacts. We integrated non-invasive, invasive, and citizen-science methods to address questions on abundance, distribution, disease status, genetic structure, and habitat fragmentation. Methods: We compiled bighorn sightings collected during river trips by park staff, commercial guides, and private citizens from 2000-2018 and captured bighorn in 2010-2016 to deploy GPS collars and test for disease. From 2011-2015, we noninvasively collected fecal samples and genotyped them at 9-16 microsatellite loci for individual identification and genetic structure. We used assignment tests to evaluate genetic structure and identify subpopulations, then estimated gene flow and recent migration to evaluate fragmentation. We used spatial capturerecapture to estimate annual population size, distribution, and trends after accounting for spatial variation in detection with a resource selection function model. Results and discussion: From 2010-2018, 3,176 sightings of bighorn were reported, with sightings of 56-145 bighorn annually on formal surveys. From 2012-2016, bighorn exhibiting signs of respiratory disease were observed along the river throughout the park. Of 25 captured individuals, 56% were infected by Mycoplasma ovipneumoniae, a key respiratory pathogen, and 81% were recently exposed. Pellet sampling for population estimation from 2011-2015 yielded 1,250 genotypes and 453 individuals. We detected 6 genetic clusters that exhibited mild to moderate genetic structure (F |
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قاعدة البيانات: | Complementary Index |
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