. Campestrian — Cordilleran Widespread Fig. 129. Proportional contribution to Coloradan fauna of each of nine areographic theriofaunal elements and of widespread species. Felis concolor Lynxrufus Cervus canadensis Odocoileus hemionus Odocoileus virginianus An additional species, Zapus hudsonius (not mapped), has a continental distribution unlike that of any other Coloradan mammal and is included in this discussion of wide- spread species for want of any more mean- ingful association. The meadow jumping mouse ranges across boreal North America and occurs southward in the eastern and central Uni
. Campestrian — Cordilleran Widespread Fig. 129. Proportional contribution to Coloradan fauna of each of nine areographic theriofaunal elements and of widespread species. Felis concolor Lynxrufus Cervus canadensis Odocoileus hemionus Odocoileus virginianus An additional species, Zapus hudsonius (not mapped), has a continental distribution unlike that of any other Coloradan mammal and is included in this discussion of wide- spread species for want of any more mean- ingful association. The meadow jumping mouse ranges across boreal North America and occurs southward in the eastern and central United States. The species is present as an apparent relict in Colorado, restricted to the South Platte drainage immediately adjacent to the mountain front. In many re- spects, the range of Zapus hudsonius resem- bles those of species herein termed the Boreo- cordilleran Faunal Element, but in Colorado the species does not occur in the mountains. Rather, a closely related Cordilleran species, Zapus princeps, occupies the highlands of Colorado. The proportional contribution to the mam- malian fauna of Colorado by each of nine distinctive theriofaunal elements and of wide- spread species is shown in figure 129. Ob- viously, the most important contributions are on the part of eurychores and Chihuahuan species, with prominent proportions due to a number of other elements. The geographic centers of co-occurrence of members of eight faunal elements (Neo- tropical not indicated) is shown in figure 130. The meaning of such centers is a moot ques- tion. At the least they are centers of maximal coincidence of ranges, that area occupied in common by all members of the faunal ele- ment. In the most sanguine view, such areas are centers of origin. In fact, probably each such center has a distinctive eco-historical
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmammals
