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Location Folder Show Tree ROOT _Users Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts U.S. Geological Survey Matthew J Gould U.S. Geological Survey - ScienceBase Kathryn A Schoenecker Ecosystems More... Tag Types Theme (2) Place (2) USGS Scientific Topic Keyword (2) Harvest Set (2) Tag Schemes None (2) Common geographic areas (2) USGS Thesaurus (2) ISO 19115 Topic Category (2) View Results as: JSON ATOM CSV Browse Folder

Detections of burros from helicopter aerial surveys in the southwestern US, 2016-2018 Feral burros (Equus asinus) and horses (E. ferus caballus) inhabiting public land in the western United States are intended to be managed at population levels established to promote a thriving, natural ecological balance. Like many large ungulate populations, management agencies employ aerial surveys to obtain estimates of horse and burro population sizes. Double-observer sightability (MDS) models perform well for estimating feral horse abundances, yet the effectiveness of these models for use in burro populations is less understood and may be different due to the smaller size, stoic behavior, and cryptic pelage of burros. These models help minimize detection bias, yet bias can be further reduced with models that... Categories: Data; Tags: Arizona, California, Ecology, Fort Irwin National Training Center, Lake Pleasant Herd Management Area, All tags... Sinbad Herd Management Area, USGS Science Data Catalog (SDC), USGS-EMA-LOW-MR Rangeland, USGS-EMA-LOW-SB SMC: Wild horses, Utah, Wildlife Biology, abundance estimation, aerial survey, biota, burro, detection probability, double-observer, helicopter, residual heterogeneity, sightability, Fewer tags Genetic structure of American black bear populations in the American Southwest and northern Mexico, 1994-2014 Microsatellite genotypes for American black bears collected by Gould et al. 2002 and used to assess the genetic structure of American black bear populations in the American Southwest and northern Mexico. Genotypes are for Ursus americanus individuals. Categories: Data; Tags: American Southwest, American black bear, Arizona, Coahuila de Zaragoza, Colorado, All tags... Landscape Genetics, Mexico, New Mexico, North America, Northern Mexico, Pleistocene, Population Genetic Structure, Texas, USGS Science Data Catalog (SDC), United States, Ursus americanus, Utah, Wildlife Biology, biota, Fewer tags