Differences in gene flow in a twofold secondary contact zone of pond turtles in southern Italy (Testudines: Emydidae:Emys orbicularis galloitalica,E. o. hellenica,E. trinacris)

Mario Lo Valvo, Francesco Sacco, Federico Marrone, Marco Arculeo, Melita Vamberger, Stefania D'Angelo, Stefania D'Angelo, Michael Wink, Claudia Corti, Uwe Fritz, Heiko Stuckas, Marc Cheylan

Risultato della ricerca: Articlepeer review

42 Citazioni (Scopus)

Abstract

Using virtually range-wide sampling for three pond turtle taxa (Emys orbicularis galloitalica,E. o. hellenica, E. trinacris), we analyse gene flow across their southern Italian contact zone.Based on population genetic analyses of 15 highly polymorphic microsatellite loci and amitochondrial marker, we show that the general genetic pattern matches well with the currenttaxon delimitation. Yet, single individuals with conflicting genetic identity suggesttranslocation of turtles by humans. In addition, we identify in south-western France and thevicinity of Rome populations being heavily impacted by introduced turtles. Cline analysesreveal that the major genetic break between E. o. galloitalica and E. o. hellenica correspondswell with the currently accepted intergradation zone in southern Italy. However, introgressionis largely unidirectional from E. o. galloitalica into E. o. hellenica. In the distributionrange of the latter subspecies, genetic footprints of E. o. galloitalica are evident along mostof the Italian east coast. Our results corroborate that E. o. galloitalica was introduced longago in Corsica and Sardinia and naturalized there. Gene flow between E. orbicularis andE. trinacris is negligible, with the Strait of Messina matching well with the narrow cline centrebetween the two species. This contrasts with other Mediterranean freshwater turtle specieswith extensive transoceanic gene flow. Compared to the two subspecies of E. orbicularis,the Sicilian E. trinacris shows an unexpectedly strong population structuring, a findingalso of some relevance for conservation. The differences between the two taxon pairsE. orbicularis/E. trinacris and E. o. galloitalica/E. o. hellenica support their current taxonomicclassification and make them attractive objects for follow-up studies to elucidate theunderlying mechanisms of speciation by comparing their properties
Lingua originaleEnglish
pagine (da-a)233-249
Numero di pagine17
RivistaZoologica Scripta
Volume44
Stato di pubblicazionePublished - 2015

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.1100.1103???
  • ???subjectarea.asjc.1300.1312???
  • ???subjectarea.asjc.1300.1311???

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