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Historical colonization and demography of the Mediterranean damselfish, Chromis chromis

dc.contributor.authorDomingues, Vera dos Santos
dc.contributor.authorBucciarelli, Giuseppe
dc.contributor.authorAlmada, Vítor Carvalho
dc.contributor.authorBernardi, Giacomo
dc.date.accessioned2012-06-15T19:20:52Z
dc.date.available2012-06-15T19:20:52Z
dc.date.issued2005
dc.description.abstractThe desiccation of the Mediterranean Sea during the Messinian Salinity Crisis 6.0–5.3 million years ago (Ma), caused a major extinction of the marine ichthyofauna of the Mediterranean. This was followed by an abrupt replenishment of the Mediterranean from the Atlantic after the opening of the Strait of Gibraltar. In this study, we combined demographic and phylogeographic approaches using mitochondrial and nuclear DNA markers to test the alternative hypotheses of where (Atlantic or Mediterranean) and when (before or after the Messinian Salinity Crisis) speciation occurred in the Mediterranean damselfish, Chromis chromis. The closely related geminate transisthmian pair Chromis multilineata and Chromis atrilobata was used as a way of obtaining an internally calibrated molecular clock. We estimated C. chromis speciation timing both by determining the time of divergence between C. chromis and its Atlantic sister species Chromis limbata(0.93–3.26 Ma depending on the molecular marker used, e.g. 1.23–1.39 Ma for the control region), and by determining the time of coalescence for C. chromis based on mitochondrial control region sequences (0.14–0.21 Ma). The time of speciation of C. chromis was always posterior to the replenishment of the Mediterranean basin, after the Messinian Salinity Crisis. Within the Mediterranean, C. chromis population structure and demographic characteristics revealed a genetic break at the Peloponnese, Greece, with directional and eastbound gene flow between western and eastern groups. The eastern group was found to be more recent and with a faster growing population (coalescent time = 0.09–0.13 Ma, growth = 485.3) than the western group (coalescent time = 0.13–0.20 Ma, growth = 325.6). Our data thus suggested a western origin of C. chromis, most likely within the Mediterranean. Low sea water levels during the glacial periods, the hydrographic regime of the Mediterranean and dispersal restriction during the short pelagic larval phase of C. chromis(18–19 days) have probably played an important role in C. chromis historical colonization.por
dc.identifier.citationMolecular Ecology, 14, 4051-4063por
dc.identifier.issn0962-1083
dc.identifier.urihttp://hdl.handle.net/10400.12/1464
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherBlackwell Publishingpor
dc.subjectChromispor
dc.subjectCoalescencepor
dc.subjectMediterraneanpor
dc.subjectMessinianpor
dc.subjectSalinity crisispor
dc.subjectPhylogeographypor
dc.subjectSpeciationpor
dc.titleHistorical colonization and demography of the Mediterranean damselfish, Chromis chromispor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceOxfordpor
oaire.citation.endPage4063por
oaire.citation.startPage4051por
oaire.citation.titleMolecular Ecologypor
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor

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