![]() Revision generate portant sur l'analyse de 213 individus. Le polymorphisme chromosomique des Mus africaines du sous-genre Leggada. Tissue Culture Assoc., Meeting of Miami, p. Cytogenetic mechanisms and speciation of mammals. Evolution chromosomique et speciation chez des souris africaines du sous-genre Leggada (Gray, 1837). Etude de 35 exemplaires provenant de l'afrique de Sud, de la Cote d'Ivoire et du Gabon. Cytogenetique des Mus africains du sous-genre Leggada. Etude cytogenetique du sous-genre Leggada Gray (Mammalia-Muridae). La signification des mutations chromosomiques dans les processus de speciation. Evolution chromosomique et speciation chez les Mus du sous-genre Leggada Gray 1837. Frey The Quaternary of the United States. Pleistocene pollen analysis and biogeography of the Southwest, p. The ideogram of the mouse ( Mus musculus). Chromosome variability and geographic distribution in insects. A study of the flora and vegetation of the valley of the Rio Mayo, Sonora. A black population of the Goldman pocket mouse. Inbreeding and gene fixation in small populations, p. Genetic conditions which promote or retard the formation of species. Faunal relationships and geographic distribution of mammals in Sonora, Mexico. Buettner-Janusch Evolutionary and Genetic Biology of Primates, Vol. The systematic status of Perognathus artus and Perognathus goldmani (Rodentia). NatureServe notes that the “remaining population consists of a few dozen individuals. ![]() POPULATION TREND: The population of the Pacific pocket mouse has declined markedly from severe and continuing loss of habitat due to urban and agricultural expansion. THREATS: The pocket mouse faces severe and continuing loss of habitat to urban and agricultural use remaining mouse populations are imminently threatened by land development, fuel modification for fire protection, and domestic- and feral-cat predation. ![]() The Pacific pocket mouse stores food in underground burrows. A low food supply likely induces winter hibernation behavior during winters of abundant food, mice will remain active.įEEDING: Mice feed primarily on seeds of grasses and forbs, as well as on green vegetation in spring and sometimes on insects. Adults may hibernate from roughly September to April and stay in their burrows continuously for up to five months in winter, alternating between periods of dormancy and feeding on stored seeds. In captivity, Pacific pocket mice may live four to six years in the wild, mice may live one to two years. LIFE CYCLE: Young are born in a nest in an underground burrow and are capable of breeding in the same season they're born. The Pacific pocket mouse reaches sexual maturity in two to five months, though reproduction may not take place in years with below-average precipitation. Gestation takes 22 to 23 days young are weaned in 30 days. Females typically produce one or occasionally two litters per year, with two to eight young per litter. MIGRATION: The Pacific pocket mouse is nonmigratory.īREEDING: Breeding season generally peaks in spring but varies with temperatures, food supply, and plant growth. RANGE: The Pacific pocket mouse is endemic to coastal southwestern California the mouse formerly occurred at a minimum of eight locales encompassing 29 sites from Los Angeles County south to San Diego County. HABITAT: This mouse lives on fine-grain, sandy substrates and historically inhabited coastal dunes, river alluvium, and sage scrub habitats growing on marine terraces within approximately 2.4 miles of the ocean. The soles of the hind feet are hairy, giving the mouse one of its most distinguishing features. The ears are tipped with a patch of light hairs, and the tail is bi-colored. The coat is soft, bristle free, and light pinkish brown in color, with a lighter, sometimes white underside. PACIFIC POCKET MOUSE } Perognathus longimembris pacificusĭESCRIPTION: The Pacific pocket mouse is a nocturnal granivore ranging in size from 4.3 to 5.2 inches from the nose to tip of the tail. ![]()
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