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When is a species not a species? Uncoupled phenotypic, karyotypic and genotypic divergence in two species of South African laminate-toothed rats (Murinae: Otomyini)

dc.contributor.authorTaylor P.J.
dc.contributor.authorMaree S.
dc.contributor.authorVan Sandwyk J.
dc.contributor.authorBaxter R.
dc.contributor.authorRambau R.V.
dc.date.accessioned2011-05-15T15:59:53Z
dc.date.available2011-05-15T15:59:53Z
dc.date.issued2009
dc.identifier.citationJournal of Zoology
dc.identifier.citation277
dc.identifier.citation4
dc.identifier.issn9528369
dc.identifier.other10.1111/j.1469-7998.2008.00542.x
dc.identifier.urihttp://hdl.handle.net/10019.1/11412
dc.description.abstractChromosomal polytypy, morphological conservatism and absence of data have frustrated the taxonomic revision of two species of southern African-endemic laminate-toothed rats (Otomys irroratus and Otomys saundersiae s.l.). New cytogenetic (G-banding and fluorescence in situ hybridization), DNA sequence [cytochrome b (cyt b) gene] and geometric morphometric data demonstrate the synonymy of O. saundersiae from Grahamstown (Eastern Cape, South Africa) under O. irroratus, and the validity of Otomys karoensis from the Fynbos Biome of the Western Cape. Phenotypic dimorphism in pelage colour and cranial morphology in O. irroratus from the climatically unpredictable Albany Thicket (=Savanna) Biome of the Eastern Cape results from the retention of allometric paedomorphic traits in some adults (saundersiae morph) but not others. The same paedomorphic traits are associated with speciation and karyotypic and genetic differentiation in O. karoensis. Within O. irroratus, two phenotypically and genotypically (cyt b divergence=6.4%) divergent lineages correspond with the Fynbos/Albany Thicket and Grassland biomes. Incipient speciation in O. irroratus seems to be associated with ecology rather than karyotype. © 2009 The Zoological Society of London.
dc.subjectallometry
dc.subjectbiome
dc.subjectchromosome
dc.subjectcytochrome
dc.subjectcytogenetics
dc.subjectdivergence
dc.subjectDNA
dc.subjectfynbos
dc.subjectgrassland
dc.subjectkaryotype
dc.subjectmorphology
dc.subjectmorphometry
dc.subjectphenotypic plasticity
dc.subjectphylogenetics
dc.subjectrodent
dc.subjectspeciation (biology)
dc.subjecttaxonomy
dc.subjectAfrica
dc.subjectSouth Africa
dc.subjectSouthern Africa
dc.subjectSub-Saharan Africa
dc.subjectWestern Cape
dc.subjectMuridae
dc.subjectMurinae
dc.subjectOtomys
dc.subjectOtomys irroratus
dc.subjectOtomys saundersiae
dc.subjectRattus
dc.titleWhen is a species not a species? Uncoupled phenotypic, karyotypic and genotypic divergence in two species of South African laminate-toothed rats (Murinae: Otomyini)
dc.typeArticle
dc.description.versionArticle


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