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Population connectivity buffers genetic diversity loss in a seabird

Oscar Ramírez1*, Elena Gómez-Díaz1, Iñigo Olalde1, Juan Carlos Illera2, Juan Carlos Rando3, Jacob González-Solís4 and Carles Lalueza-Fox1

Author Affiliations

1 Institute of Evolutionary Biology (CSIC-Universitat Pompeu Fabra), Barcelona, Spain

2 Research Unit of Biodiversity (UO-CSIC-PA), Oviedo University, Asturias, Spain

3 Departamento de Biología Animal (UDI Zoología), Universidad de La Laguna, La Laguna, Tenerife, Spain

4 Institut de Recerca de la Biodiversitat and Departament de Biologia Animal, Universitat de Barcelona, Barcelona, Spain

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Frontiers in Zoology 2013, 10:28  doi:10.1186/1742-9994-10-28

Published: 20 May 2013

Abstract

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.

Keywords:
Ancient DNA; Population size; Calonectris