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Seasonal Diets of the Porcupine Caribou Herd

D. C. Thompson and K. H. McCourt
The American Midland Naturalist
Vol. 105, No. 1 (Jan., 1981), pp. 70-76
DOI: 10.2307/2425011
Stable URL: http://www.jstor.org/stable/2425011
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Seasonal Diets of the Porcupine Caribou Herd
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Abstract

Microhistological techniques were used to quantify the diet of the Porcupine Caribou Herd of the northern Yukon during seven phenological periods. Winter diet was characterized by a dominance of lichens (66.7%) and mosses (28.8%). The shift from winter to summer diet was marked by a large increase in the use of vascular vegetation. Sedges comprise the bulk (55.5%) of the spring diet with orthophyll shrubs assuming dominance (over 98%) during the postcalving period. The use of orthophyll shrubs begins to decline during August and by autumn the diet is essentially similar to that during winter.

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