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Cryptic speciation in the field vole: a multilocus approach confirms three highly divergent lineages in Eurasia
University of Porto, Portugal University of York, England University of Porto, Portugal .
University of York, England National Museums Scotland, Scotland .
University of Porto, Portugal .
Linköping University, Department of Clinical and Experimental Medicine, Cell Biology. Linköping University, Faculty of Health Sciences.
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2012 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 21, no 24, 6015-6032 p.Article in journal (Refereed) Published
Abstract [en]

Species are generally described from morphological features, but there is growing recognition of sister forms that show substantial genetic differentiation without obvious morphological variation and may therefore be considered cryptic species. Here, we investigate the field vole (Microtus agrestis), a Eurasian mammal with little apparent morphological differentiation but which, on the basis of previous sex-linked nuclear and mitochondrial DNA (mtDNA) analyses, is subdivided into a Northern and a Southern lineage, sufficiently divergent that they may represent two cryptic species. These earlier studies also provided limited evidence for two major mtDNA lineages within Iberia. In our present study, we extend these findings through a multilocus approach. We sampled 163 individuals from 46 localities, mainly in Iberia, and sequenced seven loci, maternally, paternally and biparentally inherited. Our results show that the mtDNA lineage identified in Portugal is indeed a distinct third lineage on the basis of other markers as well. In fact, multilocus coalescent-based methods clearly support three separate evolutionary units that may represent cryptic species: Northern, Southern and Portuguese. Divergence among these units was inferred to have occurred during the last glacial period; the Portuguese lineage split occurred first (estimated at c. 70 000 bp), and the Northern and Southern lineages separated at around the last glacial maximum (estimated at c. 18 500 bp). Such recent formation of evolutionary units that might be considered species has repercussions in terms of understanding evolutionary processes and the diversity of small mammals in a European context.

Place, publisher, year, edition, pages
Blackwell Publishing , 2012. Vol. 21, no 24, 6015-6032 p.
Keyword [en]
cryptic species, demography, Microtus agrestis, phylogeography, species tree
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-86893DOI: 10.1111/mec.12024ISI: 000312147300010OAI: diva2:583042

Funding Agencies|Programa Operacional Potencial Humano - Quadro de Referancia Estrategico Nacional funds from the European Social Fund||Portuguese Ministerio de Educacao e Ciencia (FCT)|SFRH/BD/27369/2006SFRH/BPD/43264/2008|

Available from: 2013-01-07 Created: 2013-01-07 Last updated: 2013-01-07

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