In San Diego, California, Cox and Hunt (1992) found that Botta's Pocket Gopher (Thomomys bottae) preferred short grasses and dry soils, and Greene (1995) suggested that Mountain Pocket Gopher (Thomomys monticola) favored moderate to high-intensity cattle grazing in the Sierra Nevada Mountains.
At these elevations, Mountain Pocket Gophers are far more common than Botta's Pocket Gopher (Ingles 1952; Jones and Baxter 2004), but gopher mounds and tunnels could not be distinguished to species level.
For example, in grasslands of the Central Valley in California, Hunter (1991) found lower density of Botta's Pocket Gophers on grazed sites, which he attributed to compacted soils or lower quality forage resulting from overgrazing.
Sites Moore Waco Mammoth Laubach Friesenhahn Species Pit Site Cave Cave Sorex cinereus Masked shrew Blarina brevicauda x Short-tailed shrew Cynomys ludovicianus x + Black-tailed prairie dog Geomys bursarius + + + Plains pocket gopher Thomomys bottae Botta's pocket gopher
Peromyscus nasutus x Rock mouse Baiomys taylori Northern pygmy mouse Onychomys leucogaster Short-tailed grasshopper mouse Microtus ochrogaster Prairie vole Microtus pennsylvanicus Meadow vole Microtus sp.
-- Botta's pocket gopher
occurs in suitable soils through much of Trans-Pecos Texas and the hill country of central Texas (Davis, 1974).
Additional reports about the distribution of this species in central Texas are needed if the taxonomic status and biogeographic history of Botta's pocket gopher are to be learned.
-- In October of 1986 and 1988, six adult Botta's pocket gophers were trapped by use of Victor traps in Schleicher County, 5 mi.
Niceswanger (2002) reported Botta's pocket gophers Thomomys bottae eating purple amole (stems, leaves, flowers) on Fort Hunter Liggett.
Although the population appears stable on Fort Hunter Liggett, we identify invasive plants, Botta's pocket gophers, feral pigs and possibly lack of fire as threats in 2012 (Table 1).
In addition, we observed Botta's pocket gophers causing extensive disturbance to the habitat in 2011 and 2012, especially where invasive plants were abundant.