Conservation Genetics

, Volume 9, Issue 3, pp 495–505 | Cite as

High genetic diversity in the blue-listed British Columbia population of the purple martin maintained by multiple sources of immigrants

  • Allan J. Baker
  • Annette D. Greenslade
  • Laura M. Darling
  • J. Cam Finlay
Research Article

Abstract

To assess genetic diversity in the blue-listed purple martin (Progne subis) population in British Columbia, we analysed mitochondrial control region sequences of 93 individuals from British Columbia and 121 individuals collected from seven localities of the western and eastern North American subspecies P. s. arboricola and P. s. subis, respectively. Of the 47 haplotypes we detected, 34 were found exclusively in western populations, and 12 were found only in eastern populations. The most common eastern haplotype (25) was also found in three nestlings in British Columbia and one in Washington. Another British Columbia nestling had a haplotype (35) that differed by a C to T transition from haplotype 25. Coalescent analysis indicated that these five nestlings are probably descendents of recent immigrants dispersing from east to the west, because populations were estimated to have diverged about 200,000–400,000 ybp, making ancestral polymorphism a less likely explanation. Maximum likelihood estimates of gene flow among all populations detected asymmetrical gene flow into British Columbia not only of rare migrants from the eastern subspecies in Alberta but also a substantial number of migrants from the adjacent Washington population, and progressively lower numbers from Oregon in an isolation-by distance pattern. The influx of migrants from different populations is consistent with the migrant-pool model of recolonization which has maintained high genetic diversity in the small recovering population in British Columbia. Thus, the risk to this population is not from genetic erosion or inbreeding following a severe population crash, but from demographic stochasticity and extinction in small populations.

Keywords

Genetic diversity Migrant-pool recolonization Blue-listed population Purple martin Nest box recovery 

Notes

Acknowledgements

The research was made possible by grants and sponsorship from NSERC, the Rocky Point Bird Observatory, British Columbia Ministry of Environment, Lands and Parks, Canada Department of National Defense, Washington Department of Fish and Wildlife, British Columbia Habitat Conservation Trust Fund, Toronto Dominion Friends of the Environment Foundation, and the Purple Martin Conservation Association. We gratefully acknowledge our many volunteer partners who assisted collecting blood samples: California: Dan Airola, Thomas Leeman, Stan Kostka, Stan Wright; Oregon: Bruce Campbell, Kat Beal, Terry Farrell, Marnie Albritten, Wayne Burns; Washington: Michelle Tirhi, Kevin Li; Pennsylvania: James R. Hill III, Eugene Morton, Bridget Stutchbury, Tony Salvadori; Manitoba: Ernie Didur; Ontario, Bill Petrie; Alberta: Hardy Pletz, Pamela Gordy; British Columbia: Tom Gillespie, Michael Setterington. Laboratory work was conducted by O. Haddrath (OH) and A. Greenslade (ADG), and statistical analysis of the DNA data was performed by ADG and AJB. O. Haddrath, Royal Ontario Museum, designed a martin-specific primer and assisted with data collection and experiment design. We thank Bruce Cousens who provided essential input to the data collection and natural history aspects of this paper, and carefully checked the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Allan J. Baker
    • 1
  • Annette D. Greenslade
    • 1
  • Laura M. Darling
    • 2
  • J. Cam Finlay
    • 3
  1. 1.Department of Natural HistoryRoyal Ontario MuseumTorontoCanada
  2. 2.B.C. Ministry of EnvironmentVictoriaCanada
  3. 3.VictoriaCanada

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