Northward expansion of one common species, Thomomys bottae
, was observed.
Field studies indicate that there is only one instance of an owl pellet on one of the islands that contained an obvious transport from the continental coast (Thomomys bottae
; PWC field notes).
According to Vleck (1981), foraging in Thomomys bottae
(Botta's pocket gopher) is a balance between acquiring energy from food and expending energy while expanding tunnels in search of food.
Localized high densities of subterranean tunnels created by pocket gophers (Thomomys bottae
) and moles (Scapanus spp.).
Those studies that have examined natural populations of subterranean rodents have revealed a variety of diel patterns of activity, including species that are primarily diurnal (e.g., Thomomys bottae
: Gettinger, 1984; Spalacopus cyanus: Urrejola et al., 2005; Ctenomys talarum: Cutrera et al., 2006; Fukomys anselli: Skliba et al., 2014), species that are primarily nocturnal (e.g., Georychus capensis: Lovegrove and Papenfus, 1995; Fukomis mechowii: Lovy et al., 2013), and species in which activity occurs in bouts throughout the 24-hour cycle (e.g., Cryptomys hottentotus: Hickman, 1980; Fukomys damarensis: Lovegrove, 1988).
and Thomomys bottae
) and seven lizards (Aspidocelis hyperythra, Aspidocelis sp.
Key words: Botta's Pocket Gopher, cattle grazing, Great Gray Owl, meadows, Mountain Pocket Gopher, Sierra Nevada Mountains, Strix nebulosa, Thomomys bottae
, Thomomys monticola
More specifically, Geomys bursarius is parapatric with Thomomys talpoides, Thomomys bottae
, and Cratogeomys castanops; T.
For example, the impacts on nutrient cycling processes because of the influence of pocket gophers (Thomomys bottae
) (Mooney and Hobbs 1994), kangaroo rats (Dipodomys spectabilis) (Chew and Whitford 1992; Guo 1996), and prairie dogs (Cynomus ludovicianus) have all been measured (Carlson and White 1988).
maniculatus), western harvest mouse (Reithrodontomys megalotis), California pocket mouse (Chaetodipus californicus), agile kangaroo rat (Dipodomys agilis), California ground squirrel (Spermophilus beecheyi), and Botta's pocket gopher (Thomomys bottae
Items commonly used by both species include black-tailed hares (Lepus californicus), desert cottontails (Sylvilagus audubonii), kangaroo rats (Dipodomys spp.), pocket mice (Chaetodipus californicus, Perognathus inornatus), California ground squirrels (Spermophilus beechyi), pocket gophers (Thomomys bottae
), grasshoppers (Acrididae), Jerusalem crickets (Gryllacrididae), and beetles (Eleodes spp.).