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Vital Characteristics of an Insular Bobwhite Population

R. A. Cookingham and T. H. Ripley
The Journal of Wildlife Management
Vol. 28, No. 4 (Oct., 1964), pp. 855-857
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3798806
Stable URL: http://www.jstor.org/stable/3798806
Page Count: 3
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Vital Characteristics of an Insular Bobwhite Population
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Abstract

Thirteen wild bobwhites (Colinus virginianus), survivors from 17 birds trapped on Cape Cod and liberated on Great Island in West Yarmouth, Massachusetts, in 1954, increased to a fall population level of 94 birds within two breeding seasons. The annual overwintering population increased sharply the first 2 years, then leveled off and stabilized between 5 and 7 years. Summer gains showed a marked inverse relation to level of the overwintering population. Overwintering mortality apparently remained constant, regardless of population density. Postnesting survival may have been the factor most closely associated with change in population density. No specific findings for sex and age composition appeared related to characteristics peculiar to an expanding population.

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