Antipodean white sharks on a Mediterranean walkabout? historical dispersal leads to genetic discontinuity and an endangered anomalous population

Gubili C., Bilgin R., Kalkan E., Karhan S. Ü., Jones C. S., Sims D. W., ...Daha Fazla

Proceedings of the Royal Society B: Biological Sciences, cilt.278, sa.1712, ss.1679-1686, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 278 Sayı: 1712
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1098/rspb.2010.1856
  • Dergi Adı: Proceedings of the Royal Society B: Biological Sciences
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1679-1686
  • Anahtar Kelimeler: Climate change, Conservation, Mediterranean, Migration, Mitochondrial DNA, White shark
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

The provenance of white sharks (Carcharodon carcharias) in the Mediterranean is both a conundrum and an important conservation issue. Considering this species's propensity for natal philopatry, any evidence that the Mediterranean stock has little or no contemporary immigration from the Atlantic would suggest that it is extraordinarily vulnerable. To address this issue we sequenced the mitochondrial control region of four rare Mediterranean white sharks. Unexpectedly, the juvenile sequences were identical although collected at different locations and times, showing little genetic differentiation from Indo-Pacific lineages, but strong separation from geographically closer Atlantic/western Indian Ocean haplotypes. Historical long-distance dispersal (probably a consequence of navigational error during past climatic oscillations) and potential founder effects are invoked to explain the anomalous relationships of this isolated 'sink' population, highlighting the present vulnerability of its nursery grounds. © 2010 The Royal Society.