Abstract
The Rufous Hummingbird (Selasphorus rufus) population is declining in some areas of North America, but not in others. The reasons for the decline are, as yet, unknown. Understanding the genetic population structure of this species could be useful in understanding its dispersal behaviour and whether particular geographical areas should be treated as separate conservation units. We tested 16 microsatellite markers designed for other hummingbird species for amplification in Rufous Hummingbirds. Using six polymorphic markers, we found that the Rufous Hummingbird population was weakly structured such that birds breeding in central British Columbia could be distinguished from those breeding on Vancouver Island and those in Alberta, each several hundred kilometres away. Whether landscape features such as the Rocky Mountains and Fraser River Valley significantly affect dispersal patterns requires further investigation.
Zusammenfassung
Genetische Variabilität und Struktur bei der Rotrücken-Zimtelfe
Die Rotrücken-Zimtelfe (Selasphorus rufus), eine Kolibriart in Nordamerika, nimmt in manchen Gebieten ab, in anderen jedoch nicht. Die Ursachen des Bestandsrückgangs sind bisher jedoch weitgehend unbekannt. Um entsprechende Schutzstrategien für die einzelnen Populationen gezielt entwickeln zu können, ist ein besseres Verständnis der genetischen Struktur und damit der Wanderbewegungen zwischen den einzelnen Populationen notwendig. Insgesamt wurden in dieser Arbeit 16 Mikrosatellitenmarker anderer Kolibriarten getestet und auf ihre artspezifische Eignung hin überprüft. Sechs polymorphe Marker konnten erfolgreich für die Analysen bei S. rufus etabliert werden. Die Populationen zeigten nur geringe genetische Unterschiede, Individuen aus Vancover Island, British Columbia, und Alberta ließen sich jedoch unterscheiden. Welche Rolle Bergzüge wie die Rocky Mountains oder Täler wie das Fraser River Valley für das Dispersal der Art hat, sollte in zukünftigen Studien genauer analysiert werden.
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Acknowledgments
Financial support was provided by NERC and the Natural Sciences and Engineering Research Council of Canada. We thank Cam Finlay and members of the British Columbia Hummingbird banding network for collecting samples, Jonathan Moran for sharing samples with us, Judith St John and Sara Oyler-McCance for the use of their primers and Jaime Garcia-Moreno for his support and for providing the samples of Lampornis amethystinus that G.S. used to developed the six loci for that species which we have subsequently tested in Selasphorus rufus.
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Communicated by M. Wink.
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Bailey, I.E., Segelbacher, G., Healy, S.D. et al. Microsatellite variation in Rufous Hummingbirds (Selasphorus rufus) and evidence for a weakly structured population. J Ornithol 154, 1029–1037 (2013). https://doi.org/10.1007/s10336-013-0971-2
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DOI: https://doi.org/10.1007/s10336-013-0971-2