Ancient DNA reveals interstadials as a main driver of the temperate
common vole (Microtus arvalis) population dynamics during the Last
Glacial Period
Abstract
The common vole is a temperate rodent widespread across Europe.
Phylogeographic studies of its extant populations suggested the Last
Glacial Maximum (LGM) as one of the main drivers of the species’
population history. However, analyses based solely on extant genetic
diversity may not recover the full complexity of Late Pleistocene
population dynamics. To reconstruct the population history of the common
vole through the Last Glacial Period, we analysed a 4.2 kb-long fragment
of mitochondrial DNA of 148 ancient and 51 modern specimens, sampled
from across Europe, and covering the last 60 thousand years (ka). We
estimate the time to the most recent common ancestor of Last Glacial
common vole lineages to 90 ka ago and the diversification of the main
extant lineages to between 55 and 40 ka ago, substantially earlier than
previously estimated. Our data suggests multiple lineage turnovers in
Europe at the end of Marine Isotope Stage (MIS) 3 and around the
Pleistocene/Holocene transition. Conversely, data from the Western
Carpathians suggest continuity throughout the LGM. This further suggests
that climate amelioration during MIS 2 had little impact on common voles
and that the main driver of population dynamics was the reduction of
open habitats during the interstadial periods.