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. 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 importan

. 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 importan Stock Photo
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The Bookworm Collection / Alamy Stock Photo

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MCKP68

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2891 x 1729 px | 24.5 x 14.6 cm | 9.6 x 5.8 inches | 300dpi

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. 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.

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