Population connectivity buffers genetic diversity loss in a seabird

Background: Ancient DNA has revolutionized conservation genetic studies as it allows monitoring of the genetic variability of species through time and predicting the impact of ecosystems’ threats on future population dynamics and viability. Meanwhile, the consequences of anthropogenic activities and...

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Bibliographic Details
Published in:Frontiers in zoology 2013
Main Authors: Ramírez, Oscar, Gómez Díaz, Elena, Olalde Marquínez, Íñigo, 1987, Illera, Juan Carlos, Rando, Juan Carlos, González Solís, Jacob, Lalueza Fox, Carles, 1965
Format: Article
Language:English
Subjects:
ADN fòssil
ADN mitocondrial
Ancient DNA
Anàlisi
Calonectris
Genètica
Genètica evolutiva
Population size
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Summary:Background: Ancient DNA has revolutionized conservation genetic studies as it allows monitoring of the genetic variability of species through time and predicting the impact of ecosystems’ threats on future population dynamics and viability. Meanwhile, the consequences of anthropogenic activities and climate change to island faunas, particularly seabirds, remain largely unknown. In this study, we examined temporal changes in the genetic diversity of a threatened seabird, the Cory’s shearwater (Calonectris borealis). Findings: We analysed the mitochondrial DNA control region of ancient bone samples from the late-Holocene retrieved from the Canary archipelago (NE Atlantic) together with modern DNA sequences representative of the entire breeding range of the species. Our results show high levels of ancient genetic diversity in the Canaries comparable to that of the extant population. The temporal haplotype network further revealed rare but recurrent long-distance dispersal between ocean basins. The Bayesian demographic analyses reveal both regional and local population size expansion events, and this is in spite of the demographic decline experienced by the species over the last millennia. Conclusions: Our findings suggest that population connectivity of the species has acted as a buffer of genetic losses and illustrate the use of ancient DNA to uncover such cryptic genetic events. This work has been founded by grants BFU2012-34157 to C.L-F and CGL2009-11278/BOS o J.G-S from the MINECO, Spain, and by a MC reintegration grant to E.G.-D. (ERG-2010-276838)
ISSN:1742-9994
1742-9994
DOI:10.1186/1742-9994-10-28