. The Canadian field-naturalist. 386 The Canadian Field-Naturalist Vol. 90 nj L. §3 in (/) O E I u D L. Q. 0) 1- C9 n o 03 }d ^ OJ J- n o D 03 C9 oB "^ C OJ OJ (O OJ C9 3 I 09 U 3 I- a 10 c C9 u t- Q. â D OJ O Q. ^ ^ u O u c o a tn OJ c Q. tn nJ I C9 u i_ a >> L. L. n o at 3 n I en i? ."2 Q. u E (TJ in C9 ~ 03 ^' Q. OJ C9 03 O «n iD iD â D C9 1- » TJ U n I u D (_ a (n â a (n O g c O C9 = Q. S OS I I C9 C9 U U D 13 1_ 1- a Q. «n (n TJ -o C9 C9 u) <n o O J- o u L. ~~ n 1 ^ N C9 U U X. D) U U U a tn c a o §1 O tn 10 .9 8 - H _J in O .5 < Of u .4- .3 - ICI. rotus
. The Canadian field-naturalist. 386 The Canadian Field-Naturalist Vol. 90 nj L. §3 in (/) O E I u D L. Q. 0) 1- C9 n o 03 }d ^ OJ J- n o D 03 C9 oB "^ C OJ OJ (O OJ C9 3 I 09 U 3 I- a 10 c C9 u t- Q. â D OJ O Q. ^ ^ u O u c o a tn OJ c Q. tn nJ I C9 u i_ a >> L. L. n o at 3 n I en i? ."2 Q. u E (TJ in C9 ~ 03 ^' Q. OJ C9 03 O «n iD iD â D C9 1- » TJ U n I u D (_ a (n â a (n O g c O C9 = Q. S OS I I C9 C9 U U D 13 1_ 1- a Q. «n (n TJ -o C9 C9 u) <n o O J- o u L. ~~ n 1 ^ N C9 U U X. D) U U U a tn c a o §1 O tn 10 .9 8 - H _J in O .5 < Of u .4- .3 - ICI. rotus o4cononnus & Icthrionomys Micrctus pcnnsylvanicus Figure 4. Cluster analysis of 21 habitats in Kluane region on the basis of their small-mammal communities. broad categories on the basis of rodent species. Subalpine and alpine tundras are dominated by Clethrionomys and Microtus oeconomus. A broad range of common spruce habitats is dominated by a mixture of Peromyscus and Clethrionomys, and three minor habitats (beach ridges, Dryas, and balsam poplar-buffaloberry) are dominated completely by Peromyscus. Clethrionomys is the major species in a second set of widespread spruce habitats, and finally Microtus pennsylvanicus is the major species in marshes and in shrub birch, two communities that are infrequent in the Kluane area. Year Effects Populations of most rodents fluctuate dra- matically in size. We have indicated in the previous sections how year-to-year changes can. 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 Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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