Genetic diversity of a newly established population of golden eagles on the Channel Islands, California

Biological Conservation
By: , and 

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Abstract

Gene flow can have profound effects on the genetic diversity of a founding population depending on the number and relationship among colonizers and the duration of the colonization event. Here we used data from nuclear microsatellite and mitochondrial DNA control region loci to assess genetic diversity in golden eagles of the recently colonized Channel Islands, California. Genetic diversity in the Channel Island population was low, similar to signatures observed for other recent colonizing island populations. Differences in levels of genetic diversity and structure observed between mainland California and the islands suggests that few individuals were involved in the initial founding event, and may have comprised a family group. The spatial genetic structure observed between Channel Island and mainland California golden eagle populations across marker types, and genetic signature of population decline observed for the Channel Island population, suggest a single or relatively quick colonization event. Polarity in gene flow estimates based on mtDNA confirm an initial colonization of the Channel Islands by mainland golden eagles, but estimates from microsatellite data suggest that golden eagles on the islands were dispersing more recently to the mainland, possibly after reaching the carrying capacity of the island system. These results illustrate the strength of founding events on the genetic diversity of a population, and confirm that changes to genetic diversity can occur within just a few generations.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Genetic diversity of a newly established population of golden eagles on the Channel Islands, California
Series title Biological Conservation
DOI 10.1016/j.biocon.2011.11.031
Volume 146
Issue 1
Year Published 2012
Language English
Publisher Elsevier
Contributing office(s) Alaska Science Center
Description 7 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Biological Conservation
First page 116
Last page 122
Country United States
State California
Other Geospatial Channel Islands