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Establishment of a coastal fish in the Azores : recent colonisation or sudden expansion of an ancient relict population?

Stefanni, S, Castilho, S, Sala-Bozano, R, Robalo, JI, Francisco, SM, Santos, RS, Marques, N, Brito, A, Almada, VC and Mariani, S 2015, 'Establishment of a coastal fish in the Azores : recent colonisation or sudden expansion of an ancient relict population?' , Heredity, 115 , pp. 527-537.

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The processes and time scales associated with ocean-wide changes in the distribution of marine species have intrigued biologists since Darwin’s earliest insights into biogeography. The Azores, a mid-Atlantic volcanic archipelago located more than 1000 km off the European continental shelf, offers ideal opportunities to investigate phylogeographic colonization scenarios. The benthopelagic sparid fish known as the common two-banded seabream (Diplodus vulgaris) is now relatively common along the coastline of the Azores archipelago, but was virtually absent prior to the 1990s. We employed a multiple genetic marker approach to test whether the successful establishment of the Azorean population derives from a recent colonization from western continental/island populations or from the demographic explosion of an ancient relict population. Results from nuclear and mtDNA sequences show that all Atlantic and Mediterranean populations belong to the same phylogroup, though microsatellite data indicate significant genetic divergence between the Azorean sample and all other locations, as well as among Macaronesian, western Iberian and Mediterranean regions. The results from Approximate Bayesian Computation indicate that D. vulgaris has likely inhabited the Azores for approximately 40 (95% C.I.: 5.5─83.6) to 52 (95% C.I.; 6.32─89.0) generations, corresponding to roughly 80-150 years, which suggests near contemporary colonisation, followed by a more recent demographic expansion which could have been facilitated by changing climate conditions. Moreover, the lack of previous records of this species over the past century, together with the absence of lineage separation and the presence of relatively few private alleles, do not exclude the possibility of an even more recent colonisation event.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
Journal or Publication Title: Heredity
Publisher: Nature Publishing Group
Refereed: Yes
ISSN: 0018-067X
Related URLs:
Funders: Fundação para a Ciência e Tecnologia (FCT)
Depositing User: S Rafiq
Date Deposited: 08 May 2015 10:22
Last Modified: 17 Mar 2016 13:53

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