Origin and post-colonization evolution of the Chatham Islands skink (Oligosoma nigriplantare nigriplantare).

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dc.citation.issue14
dc.citation.volume17
dc.contributor.authorLiggins L
dc.contributor.authorChapple DG
dc.contributor.authorDaugherty CH
dc.contributor.authorRitchie PA
dc.date.available2008-07-01
dc.date.issued2008-07
dc.descriptionCAUL read and publish agreement
dc.description.abstractIsland ecosystems provide an opportunity to examine a range of evolutionary and ecological processes. The Chatham Islands are an isolated archipelago situated approximately 800 km east of New Zealand. Geological evidence indicates that the Chatham Islands re-emerged within the last 1-4 million years, following a prolonged period of marine inundation, and therefore the resident flora and fauna is the result of long-distance overwater dispersal. We examine the origin and post-colonization evolution of the Chatham Islands skink, Oligosoma nigriplantare nigriplantare, the sole reptile species occurring on the archipelago. We sampled O. n. nigriplantare from across nine islands within the Chatham Islands group, and representative samples from across the range of its closest relative, the New Zealand mainland common skink (Oligosoma nigriplantare polychroma). Our mitochondrial sequence data indicate that O. n. nigriplantare diverged from O. n. polychroma 5.86-7.29 million years ago. This pre-dates the emergence date for the Chatham Islands, but indicates that O. n. nigriplantare colonized the Chatham Islands via overwater dispersal on a single occasion. Despite the substantial morphological variability evident in O. n. nigriplantare, only relatively shallow genetic divergences (maximum divergence approximately 2%) were found across the Chatham Islands. Our analyses (haplotypic diversity, Phi(ST), analysis of molecular variance, and nested clade phylogeographical analysis) indicated restricted gene flow in O. n. nigriplantare resulting in strong differentiation between islands. However, the restrictions to gene flow might have only arisen recently as there was also a significant pattern of isolation by distance, possibly from when the Chatham Islands were a single landmass during Pleistocene glacial maxima when sea levels were lower. The level of genetic and morphological divergence between O. n. nigriplantare and O. n. polychroma might warrant their recognition as distinct species.
dc.description.publication-statusPublished
dc.format.extent3290 - 3305 (16)
dc.identifierhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000257706500007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fef
dc.identifier.citationMOLECULAR ECOLOGY, 2008, 17 (14), pp. 3290 - 3305 (16)
dc.identifier.doi10.1111/j.1365-294X.2008.03832.x
dc.identifier.elements-id235508
dc.identifier.harvestedMassey_Dark
dc.identifier.issn0962-1083
dc.languageEnglish
dc.publisherWILEY-BLACKWELL
dc.relation.isPartOfMOLECULAR ECOLOGY
dc.rights© 2008 The Authors
dc.subjectScience & Technology
dc.subjectLife Sciences & Biomedicine
dc.subjectBiochemistry & Molecular Biology
dc.subjectEcology
dc.subjectEvolutionary Biology
dc.subjectEnvironmental Sciences & Ecology
dc.subjectBIOCHEMISTRY & MOLECULAR BIOLOGY
dc.subjectECOLOGY
dc.subjectEVOLUTIONARY BIOLOGY
dc.subjectisland biogeography
dc.subjectmicroevolution
dc.subjectmitochondrial DNA
dc.subjectphylogeography
dc.subjectspeciation
dc.subjecttransoceanic dispersal
dc.subjectCLADE PHYLOGEOGRAPHIC ANALYSIS
dc.subjectPOPULATION GENETIC-STRUCTURE
dc.subjectMITOCHONDRIAL-DNA SEQUENCES
dc.subjectSCINCIDAE SPECIES COMPLEX
dc.subjectNEW-ZEALAND
dc.subjectCLADISTIC-ANALYSIS
dc.subjectPHENOTYPIC ASSOCIATIONS
dc.subjectSTATISTICAL PHYLOGEOGRAPHY
dc.subjectGEOGRAPHICAL-DISTRIBUTION
dc.subjectHISTORICAL BIOGEOGRAPHY
dc.subject.anzsrc06 Biological Sciences
dc.titleOrigin and post-colonization evolution of the Chatham Islands skink (Oligosoma nigriplantare nigriplantare).
dc.typeJournal article
pubs.notesNot known
pubs.organisational-group/Massey University
pubs.organisational-group/Massey University/College of Sciences
pubs.organisational-group/Massey University/College of Sciences/School of Natural Sciences
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