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Bowyer, R. T.

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Habitat use, forage characteristics, and group size were compared among preparturient, parturient, and nonparturient female caribou during and after the birthing season, to test hypotheses involving acquisition of forage and risk of predation. Radiocollared females from the Mentasta caribou herd, Alaska (Wrangell St. Elias National Park and Preserve) were monitored in 1994 and 1995
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Alaskan moose (Alces alces gigas) consume willow (Salix spp.) as a fundamental component of their winter diet. We collected Barclay willow (S. barclayi) from 5 nearby sites (15–80 m apart) on the Kenai Peninsula, Alaska, USA, during winter 1999–2000. We tested effects of diameter and age of twigs on nutritional quality of willows for moose. Smaller-diameter twigs had higher in vitro dry matter digestibility (IVDMD), and protein content, but lower fiber content (P < 0.001) than larger twigs. An inverse relationship occurred between the age of twigs and protein content (P < 0.001), with older-aged twigs containing less protein. Accordingly, age of twigs was negatively related to fiber content (P = 0.002). Conversely,...
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