Scientia Marina, Vol 79, No 4 (2015)

Population genetic structure and demographic history of Aphanius fasciatus (Cyprinodontidae: Cyprinodontiformes) from hypersaline habitats in the eastern Adriatic


https://doi.org/10.3989/scimar.04198.06A

Ivana Buj
Department of Zoology, Faculty of Science, University of Zagreb, Croatia

Jure Miočić-Stošić
Department of Zoology, Faculty of Science, University of Zagreb, Croatia

Zoran Marčić
Department of Zoology, Faculty of Science, University of Zagreb, Croatia

Perica Mustafić
Department of Zoology, Faculty of Science, University of Zagreb, Croatia

Davor Zanella
Department of Zoology, Faculty of Science, University of Zagreb, Croatia

Milorad Mrakovčić
Department of Zoology, Faculty of Science, University of Zagreb, Croatia

Tanja Mihinjač
Department of Zoology, Faculty of Science, University of Zagreb, Croatia

Marko Ćaleta
Faculty of Teacher Education, University of Zagreb, Croatia

Abstract


In order to investigate the phylogeography and population genetic structure of the South European toothcarp (Aphanius fasciatus), we analysed gene sequences of two mitochondrial markers (cytochrome b and mtDNA control region) in samples from eight localities along the eastern Adriatic coast and combined them with sequences from other Mediterranean localities. Since the South European toothcarp primarily inhabits hypersaline water bodies, it is a good model species for understanding patterns of colonization and dispersal of species adapted to variable conditions. The eastern Adriatic populations are separated into two groups of genetically related populations. The Northern group contains the populations from Sečovlje, Pag, Dinjiška, Nin and Pantan, whereas the Southern group contains the populations from Ston, Ulcinj and Narta. The majority of divergence events date back to the Pleistocene epoch and it is likely that sea level changes during glacial cycles played a significant role in shaping the recent genetic structure of this species. Our results imply pronounced intraspecific structuring of this species, whereas great environmental variations resulted in a smaller intrapopulational genetic diversity of A. fasciatus than seen in other Mediterranean fishes.

Keywords


colonization; conservation priorities; divergence; evolution; genetic diversity; South European toothcarp

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