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• W2023181452 abstract "I evaluated reproductive rates of the critically endangered Vancouver Island marmot (Marmota vancouverensis Swarth, 1911) using data from captive and wild populations over the 1980–2004 period. Results were similar to those reported for other alpine-dwelling marmots, including the closely related Marmota caligata (Eschscholtz, 1829) and Marmota olympus (Merriam, 1898). Most females in captivity first bred at age 3 or 4 (T breed = 4.3 years, SD = 1.15, n = 9), an age not significantly different from that observed in the wild (T breed = 3.6 years, SD = 1.2, n = 16). Numbers of pups weaned per litter were similar in captivity (N pups = 3.0, SD = 1.4, n = 25) and in the wild (N pups = 3.4, SD = 1.1, n = 58). Females were capable of weaning pups in consecutive years (46.4%, n = 13) but often skipped 1 year (39.3%, n = 11) or 2 years (14.3%, n = 4) between litters. Two-year-old females weaned pups infrequently (P breed = 0.09, n = 43) and older females were far more likely to breed (P breed = 0.40, n = 200); in neither case were significant captive-wild differences found. The oldest breeding female was 10 years old, but sample sizes for marmots older than 8 years were small and maximum breeding age may be underestimated. Between-litter intervals in captivity (T between = 1.4 years, SD = 0.7, n = 11) were significantly shorter than in the wild (T between = 1.9 years, SD = 0.7, n = 17). Sex ratios of weaned pups did not differ from 1:1 in the wild (female/male = 1.04) but were significantly skewed towards males in captivity (female/male = 0.56). I conclude that reproductive performance in Vancouver Island marmots is limited both by body condition and social constraints." @default.
• W2023181452 created "2016-06-24" @default.
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• W2023181452 date "2005-05-01" @default.
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• W2023181452 title "Reproductive rates of wild and captive Vancouver Island marmots (<i>Marmota vancouverensis</i>)" @default.
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