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. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 363 FAUNAL ELEMENT Legend Upper Sonoran / sfsS /{/ //V. CUMULATIVE PERCENTAGE COMPOSITION Fig. 131. Cumulative percentage composition of mammalian component of Coloradan life-zones attribut- able to each areographic faunal element. Chihuahuan species drop out, and highland kinds, especially those of the Boreo-cordil- leran element, evince a concomitant in- crease in importance. The coniferous forest "closes up" at the interface between Transi- tion and Canadian life-zones. The Canadian and Hudsonian zon

. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 363 FAUNAL ELEMENT Legend Upper Sonoran / sfsS /{/ //V. CUMULATIVE PERCENTAGE COMPOSITION Fig. 131. Cumulative percentage composition of mammalian component of Coloradan life-zones attribut- able to each areographic faunal element. Chihuahuan species drop out, and highland kinds, especially those of the Boreo-cordil- leran element, evince a concomitant in- crease in importance. The coniferous forest "closes up" at the interface between Transi- tion and Canadian life-zones. The Canadian and Hudsonian zon Stock Photo
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Paul Fearn / Alamy Stock Photo

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RCCG1Y

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. Distribution of mammals in Colorado. Mammals. 1972 ARMSTRONG: COLORADAN MAMMALS 363 FAUNAL ELEMENT Legend Upper Sonoran / sfsS /{/ //V. CUMULATIVE PERCENTAGE COMPOSITION Fig. 131. Cumulative percentage composition of mammalian component of Coloradan life-zones attribut- able to each areographic faunal element. Chihuahuan species drop out, and highland kinds, especially those of the Boreo-cordil- leran element, evince a concomitant in- crease in importance. The coniferous forest "closes up" at the interface between Transi- tion and Canadian life-zones. The Canadian and Hudsonian zones differ in the general ab- sence of the Autochthonous Coloradan ele- ment in the higher zone and the propor- tionally greater importance of Cordilleran species there. As regards actual species com- position, the Cordilleran fauna of the two zones is the same. Some Boreo-cordilleran species typically are absent from the Hud- sonian Zone, however. The Alpine Zone compares closely with the Hudsonian in species composition, a fact consistent with the observation made earlier TABLE 32 Percentage of species of each areographic faunal element prevalent in a given Coloradan life-zone. Life-zone (and number of species) Cordil- leran Boreo- cordil- leran Neo- Cam- Great Eastern tropical pestrian Basin Yuman Chihua- huan Autoch- thonous Wide- Coloradan spread 92.8 100. 96.3 25.0 100. 92.6 100. 70.4 48.1 22.2 Upper Sonoran (97) 42.8 23.1 Transition (63) 85.7 61.5 Canadian (53) 92.8 92.3 Hudsonian (39) 92.8 69.2 Alpine (17) 42.8 30.8 100. 100. 92.8 42.8 28.6 7.1 7.1 100. 100. 60.0 30.0 20.0 100.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Armstrong, David M. Lawrence, Kan. : University of Kansas Printing Service

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