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Filters: Contacts: Barboza, Perry S. (X) > Types: Shapefile (X)

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Nutritional restrictions in winter may reduce the availability of protein for reproduction and survival in northern ungulates. We refined a technique that uses recently voided excreta on snow to assess protein status in wild caribou (Rangifer tarandus) in late winter. Our study was the first application of this non-invasive, isotopic approach to assess protein status of wild caribou by determining dietary and endogenous contributions of nitrogen (N) to urinary urea. We used isotopic ratios of N (?15N) in urine and fecal samples to estimate the proportion of urea N derived from body N (p-UN) in pregnant, adult females of the Chisana Herd, a small population that ranged across the Alaska-Yukon border. We took advantage...
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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,...
    map background search result map search result map Nutritional implications of increased shrub cover for caribou (Rangifer tarandus) in the Arctic Population genetic structure of moose (Alces alces) of south-central Alaska An isotopic approach to measuring nitrogen balance in caribou A genetic discontinuity in moose (Alces alces) in Alaska corresponds with fenced transportation infrastructure Nutritional Quality of Willows for Moose: Effects of Twig Age and Diameter Spatial synchrony of recruitment in mountain-dwelling woodland caribou Increased diet breadth of little brown bats (Myotis lucifugus) at their northern range limit: a multi-method approach A genetic discontinuity in moose (Alces alces) in Alaska corresponds with fenced transportation infrastructure Nutritional implications of increased shrub cover for caribou (Rangifer tarandus) in the Arctic Nutritional Quality of Willows for Moose: Effects of Twig Age and Diameter Population genetic structure of moose (Alces alces) of south-central Alaska An isotopic approach to measuring nitrogen balance in caribou Spatial synchrony of recruitment in mountain-dwelling woodland caribou Increased diet breadth of little brown bats (Myotis lucifugus) at their northern range limit: a multi-method approach