Fylogeografia hranostajov poskytuje dôkaz o prirodzenej kolonizácii Írska počas posledného zaľadnenia

0079499 - ÚBO 2007 CZ cze A - Abstrakt
Martínková, Natália - McDonald, R. A. - Searle, J. B.
Fylogeografia hranostajov poskytuje dôkaz o prirodzenej kolonizácii Írska počas posledného zaľadnenia.
[Stoats phylogeography provides evidence of natural colonisation of Ireland during last glaciation.]
Zoologické dny Brno 2007. Brno: Ústav biologie obratlovců, 2007 - (Bryja, J.; Zukal, J.; Řehák, Z.). s. 187. ISBN 978-80-903329-7-3.
[Zoologické dny. 08.02.2007-09.02.2007, Brno]
Výzkumný záměr: CEZ:AV0Z60930519
Klíčová slova: island colonisation * glaciation * mitochondrial DNA
Kód oboru RIV: EB - Genetika a molekulární biologie

Species change their distribution ranges in response to changes in climate, but the dynamics of the range change is variable. The stoat, Mustela erminea, is extremely temperature tolerant and can survive in arctic as well as warm temperate conditions. Based on this temperature tolerance we can imply that stoats might have survived the last glaciation in the vicinity of ice sheets. Similarly, the origin of Irish fauna is uncertain since the island was either completely (ca. 40000 years ago) of partially (ca. 19-23000 years ago) covered with ice sheets during glacial cycles. Existence of a landbridge between Ireland and Britain or continental Europe after the last glacial maximum (LGM) is dubious and controversial and so most of mammal species were likely introduced to Ireland. We sequenced 1.8 kb of mitochondrial DNA of stoats from their whole distribution area with emphasis on Ireland and Britain (186 individuals, 142 localities). Nucleotide and haplotype diversity of the Irish population was higher than that of the British population. Irish and British stoat haplotypes are more closely related to those of continental Europe than to each other, which indicates that the contemporary British stoat population did not found the Irish population. Molecular dating based on Bayesian coalescent analysis showed that Ireland was colonised around the LGM, but the British population is probably younger. This later colonisation likely represents replacement of relict mitochondrial lineage by new colonists. Molecular data indicate that stoats colonised Ireland naturally and genetic variability of the population reflects mutation accumulation during population expansion on the island.
Trvalý link: http://hdl.handle.net/11104/0144196