great basin pocket mouse

great basin pocket mouse
Name	Great Basin pocket mouse
Genus	Perognathus

great basin pocket mouse The great basin pocket mouse is a small heteromyid rodent native to the western United States and adjacent regions. It occupies arid and semi-arid ecosystems and has been studied in contexts ranging from biogeography to evolutionary biology. Research on its population dynamics, physiology, and habitat associations informs conservation and land-management decisions.

Taxonomy and naming

Perognathus species containing the common name for this taxon are treated within the family Heteromyidae, which sits in the order Rodentia alongside families such as Muridae and Sciuridae. Taxonomic treatments reference the works of historical mammalogists such as Thomas Henry Huxley-era compendia, catalogues produced by the Smithsonian Institution, and monographs published through institutions like the American Museum of Natural History and the University of California Press. Nomenclatural decisions follow codes established by the International Commission on Zoological Nomenclature and are reflected in checklists maintained by entities including the IUCN and regional state natural heritage programs such as those in Nevada, Utah, and California.

Description

Morphological descriptions compare this pocket mouse to congeners and other heteromyids like the kangaroo rat genera Dipodomys and related Perognathus longimembris. Diagnostic features include pelage coloration aligning with substrates studied in research from the Great Basin National Park region, external cheek pouches, and hindlimb proportions assessed in anatomical surveys at the Field Museum and the Natural History Museum, London. Measurements reported in faunal surveys by the United States Geological Survey and regional museums provide standard metrics for head-body length, tail length, and mass.

Distribution and habitat

The taxon occupies the Great Basin and adjoining physiographic provinces including portions of the Mojave Desert, Columbia Plateau, and Great Plains ecotones. Occurrence records are aggregated by biodiversity databases such as the Global Biodiversity Information Facility, specimen repositories at the Museum of Vertebrate Zoology, and monitoring projects by agencies including the Bureau of Land Management and the National Park Service. Preferred habitats span sagebrush scrub documented in studies from Great Basin National Park, shadscale communities near Death Valley National Park, and other arid shrublands characterized by plant associations reported by the United States Department of Agriculture Natural Resources Conservation Service.

Behavior and ecology

Behavioral ecology investigations reference field studies conducted in protected areas like Great Basin National Park and research stations affiliated with the University of Nevada, Reno and University of California, Berkeley. Nocturnal activity patterns, predator avoidance strategies, and burrow architecture have been compared to behaviors described for species in the Sciuridae and Geomyidae families in ecological journals published by societies such as the Ecological Society of America and the American Society of Mammalogists. Predator assemblages documented in region-specific carnivore studies include coyote occurrences reported by the U.S. Fish and Wildlife Service, avian predators surveyed by the Audubon Society, and reptilian predators mentioned in herpetology accounts at the California Academy of Sciences.

Diet and foraging

Dietary studies cite seed-selection experiments paralleling methodologies used in investigations of Chihuahuan Desert granivore assemblages and in seed predation research published through the Journal of Mammalogy and journals of the American Ornithological Society when considering indirect interactions. Foraging behavior has been related to plant phenology work conducted by the National Park Service and vegetation studies by the USDA Forest Service that document interactions with shrubs such as Artemisia tridentata and forbs catalogued by the Jepson Manual at the University and Jepson Herbaria. Granivory and caching behaviors are evaluated in the context of community ecology syntheses from the Society for Conservation Biology.

Reproduction and life cycle

Reproductive timing and life-history parameters are informed by long-term small-mammal trapping programs run by institutions including the Museum of Vertebrate Zoology and academic departments at the University of Utah and Brigham Young University. Litter size, gestation, and juvenile development are compared across heteromyid species in treatises edited by the American Society of Mammalogists and in handbooks such as those produced by the CRC Press. Seasonal breeding patterns correspond with climatic drivers analyzed by the National Oceanic and Atmospheric Administration and regional climate assessments carried out by the Desert Research Institute.

Conservation status and threats

Conservation assessments reference listings and criteria from the IUCN Red List and regional conservation frameworks maintained by state natural heritage programs in Nevada, Utah, and California. Threats documented in environmental impact reports prepared for the Bureau of Land Management and the U.S. Forest Service include habitat loss from development, grazing impacts analyzed by the Natural Resources Conservation Service, and altered fire regimes studied by the United States Geological Survey. Conservation measures advocated parallel those in recovery planning by the U.S. Fish and Wildlife Service and collaborative landscape-scale initiatives involving the Conservation International model, regional land trusts, and university research programs.

Category:Perognathus Category:Mammals of the United States