Ecological Separation of Three Genera of Pocket Gophers (Geomyidae)

A study of the ecology and distribution of Geomys bursarius jugossicularis Hooper, Thomomys bottae cultellus Kelson, and Pappogeomys castanops Baird was conducted in northeastern New Mexico. Comparisons of body size, soils utilized, burrow characteristics, distinguishing surface features, and winter activity revealed each species to be ecologically separate. Altitude and soils are discussed as factors influencing the geographical separation of the species, although soil appears to be the primary limiting factor. Based on the observed distribution and range of soils inhabited, the most limited distribution and the broadest range of soil types is found for the largest species P. castonops, followed by T. bottae and then G. bursarius.