Consequences of insular population structure: Distribution and extinction of spruce grouse populations

Consequences of insular population structure: Distribution and extinction of spruce grouse... The population structure of the spruce grouse ( Canachites canadensis ) was studied in the Adirondack Mountains of New York, U.S.A. Twenty-five isolated habitat patches exist and are occupied by spruce grouse, with 7 suitable but unoccupied patches existing at the periphery of the range. The regional distribution and abundance of spruce grouse is correlated with the amount of lowland coniferous forest habitat. Unoccupied patches were significantly smaller and significantly farther from occupied patches than were other occupied patches. For all patches, as distance from the nearest occupied patch increased, the percent of occupied patches decreased linearly. I incorporated birth and death rates for spruce grouse into the MacArthur-Wilson survivorship model which closely predicted the proportion of occupied patches for an average population density (2.8 ♀ spruce grouse/100ha). For the same demographic parameters, extinction times were calculated which indicate that the 15 habitat patches of a carrying capacity of ≦3 female spruce grouse (≦100 ha) would have an average extinction time of less than 6 years. This in part accounts for the high proportion of these patches which are unoccupied. Extinctions and recolonizations of patches were observed during the study. The patterns of patch occupancy can partially be predicted based on their size, spatial arrangement, and the demographic characteristics of the spruce grouse. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Oecologia Springer Journals

Consequences of insular population structure: Distribution and extinction of spruce grouse populations

Oecologia, Volume 42 (1) – Jan 1, 1979

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Publisher
Springer Journals
Copyright
Copyright © 1979 by Springer-Verlag
Subject
Life Sciences; Ecology; Plant Sciences
ISSN
0029-8549
eISSN
1432-1939
DOI
10.1007/BF00347618
Publisher site
See Article on Publisher Site

Abstract

The population structure of the spruce grouse ( Canachites canadensis ) was studied in the Adirondack Mountains of New York, U.S.A. Twenty-five isolated habitat patches exist and are occupied by spruce grouse, with 7 suitable but unoccupied patches existing at the periphery of the range. The regional distribution and abundance of spruce grouse is correlated with the amount of lowland coniferous forest habitat. Unoccupied patches were significantly smaller and significantly farther from occupied patches than were other occupied patches. For all patches, as distance from the nearest occupied patch increased, the percent of occupied patches decreased linearly. I incorporated birth and death rates for spruce grouse into the MacArthur-Wilson survivorship model which closely predicted the proportion of occupied patches for an average population density (2.8 ♀ spruce grouse/100ha). For the same demographic parameters, extinction times were calculated which indicate that the 15 habitat patches of a carrying capacity of ≦3 female spruce grouse (≦100 ha) would have an average extinction time of less than 6 years. This in part accounts for the high proportion of these patches which are unoccupied. Extinctions and recolonizations of patches were observed during the study. The patterns of patch occupancy can partially be predicted based on their size, spatial arrangement, and the demographic characteristics of the spruce grouse.

Journal

OecologiaSpringer Journals

Published: Jan 1, 1979

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