![]() ![]() Depending on environmental conditions, inherited characteristics may be advantageous, neutral, or detrimental.Traits that confer an advantage may persist in the population and are called adaptations.Over time, the proportion of individuals with advantageous traits may increase (and the proportion with disadvantageous traits may decrease) due to their chances of surviving and reproducing.Inherited characteristics affect the likelihood of an organism's survival and reproduction.New heritable traits can result from mutations.Evolution results from genetic drift acting upon genetic variation within a population.Evolution results from natural selection acting upon genetic variation within a population.Evolution occurs through multiple mechanisms.Not all similar traits are homologous some are the result of convergent evolution. Apache pocket mice aren’t the only ones to develop a white color other animals at White Sands, like insects and lizards, have done the same. ![]() There is a fit between organisms and their environments, though not always a perfect fit.An organism's features reflect its evolutionary history.Information on controversies in the public arena relating to evolution. ![]() Alignment with the Next Generation Science Standards.The big issues – Pacing, diversity, complexity, and trends.Macroevolution – Evolution above the species level.Microevolution – Evolution within a population.Mechanisms: the processes of evolution – Selection, mutation, migration, and more.The history of life: looking at the patterns – Change over time and shared ancestors.An introduction to evolution: what is evolution and how does it work?.Diurnal torpor and its relation to food consumption and weight changes in the California pocket mouse, Perognathus californicus. Diurnal torpidity in the California pocket mouse. Seasonal surface activity in Perognathus longimembris. The reproduction of heteromyid rodents in captivity. Sources & ReferencesĬalifornia Department of Fish and Game, 1999. As a small-bodied granivore, the California pocket mouse probably competes with Dipodomys heermanni and Peromyscus spp. Niche: Predators include coyotes, bobcats, owls, and snakes. Reproduction: Usually 4 young are born (range 2-7) between April and July (Eisenberg and Isaac 1963). Tucker (1962) noted that torpor could be ended by dropping temperature below 15ÁC (59ÁF). Mouse is not listed as an Identified Wildlife Species and has no protection under the current British Columbia Provincial Forest. Tucker (1966) induced torpor in laboratory animals by limiting food supply. As with other pocket mice, shows reduced activity above ground during winter cold spells (Tinkle and Harmon 1970). Species Life HistoryĪctivity Patterns: Nocturnal. Pattern: The California pocket mouse occurs in chaparral and in grassland, but probably reaches its greatest abundance where these 2 habitats occur in close proximity. Water: Obtained from moisture in seeds and leafy vegetation, and metabolically from foods. Reproduction: Young born in burrows dug in soft soil. Grazing of grassland by domestic stock eliminates cover necessary for predator avoidance. It forages mainly on the ground, but apparently also climbs up into shrubs.Ĭover: Occurs in brushy areas but probably is attracted to grass-chaparral edge. ![]() Range Mapįeeding: The California pocket mouse feeds mainly on the seeds of annual grasses and forbs, and probably consumes leafy vegetation and insects seasonally. Ranges in elevation from sea level to 2400 m (7900 ft). The California pocket mouse inhabits a variety of habitats year-round, including coastal scrub, chamise-redshank and montane chaparral, sagebrush, annual grassland, valley foothill hardwood, valley foothill hardwood-conifer, and montane hardwood habitats. Also from Auburn south along the foothills of the Sierra Nevada, and west across the Tehachapi Mts. Distributed in California from San Francisco Bay south to the border of Mexico, east to the edge of the Great Valley. ![]()
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