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Identification of metapopulation dynamics among Northern Goshawks of the Alexander Archipelago, Alaska, and Coastal British Columbia

Conservation Genetics

By:
, , , , , , , and
https://doi.org/10.1007/s10592-012-0352-z

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Abstract

Northern Goshawks occupying the Alexander Archipelago, Alaska, and coastal British Columbia nest primarily in old-growth and mature forest, which results in spatial heterogeneity in the distribution of individuals across the landscape. We used microsatellite and mitochondrial data to infer genetic structure, gene flow, and fluctuations in population demography through evolutionary time. Patterns in the genetic signatures were used to assess predictions associated with the three population models: panmixia, metapopulation, and isolated populations. Population genetic structure was observed along with asymmetry in gene flow estimates that changed directionality at different temporal scales, consistent with metapopulation model predictions. Therefore, Northern Goshawk assemblages located in the Alexander Archipelago and coastal British Columbia interact through a metapopulation framework, though they may not fit the classic model of a metapopulation. Long-term population sources (coastal mainland British Columbia) and sinks (Revillagigedo and Vancouver islands) were identified. However, there was no trend through evolutionary time in the directionality of dispersal among the remaining assemblages, suggestive of a rescue-effect dynamic. Admiralty, Douglas, and Chichagof island complex appears to be an evolutionarily recent source population in the Alexander Archipelago. In addition, Kupreanof island complex and Kispiox Forest District populations have high dispersal rates to populations in close geographic proximity and potentially serve as local source populations. Metapopulation dynamics occurring in the Alexander Archipelago and coastal British Columbia by Northern Goshawks highlight the importance of both occupied and unoccupied habitats to long-term population persistence of goshawks in this region.

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Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Identification of metapopulation dynamics among Northern Goshawks of the Alexander Archipelago, Alaska, and Coastal British Columbia
Series title:
Conservation Genetics
DOI:
10.1007/s10592-012-0352-z
Volume:
13
Issue:
4
Year Published:
2012
Language:
English
Publisher:
Kluwer Academic Publishers
Publisher location:
Dordrecht
Contributing office(s):
Alaska Science Center Biology WTEB
Description:
13 p.
First page:
1045
Last page:
1057
Country:
Canada, United States
State:
Alaska, British Columbia
Other Geospatial:
Alexander Archipelago
Online Only (Y/N):
N
Additional Online Files (Y/N):
N