TY - JOUR
T1 - Nonreceding hare lines
T2 - genetic continuity since the Late Pleistocene in European mountain hares (Lepus timidus)
AU - Smith, Steve
AU - Sandoval-Castellanos, Edson
AU - Lagerholm, Vendela K.
AU - Napierala, Hannes
AU - Sablin, Mikhail
AU - Von Seth, Johanna
AU - Fladerer, Florian A.
AU - Germonpré, Mietje
AU - Wojtal, Piotr
AU - Miller, Rebecca
AU - Stewart, John R.
AU - Dalén, Love
PY - 2017/4/1
Y1 - 2017/4/1
N2 - Throughout time, climate changes have caused substantial rearrangements of habitats which have alternately promoted and disfavoured different types of taxa. At first glance, the mountain hare (Lepus timidus) shows the typical hallmarks of a cold-adapted species that has retreated to refugia since the onset of the current Holocene interglacial. In contrary to expectations, however, the species has a high contemporary genetic diversity with no clear differentiation between geographically isolated populations. In order to clarify the phylogeographic history of European mountain hares, we here analysed ancient DNA from the glacial populations that inhabited the previous midlatitude European tundra region. Our results reveal that the Ice Age hares had similar levels of genetic variation and lack of geographic structure as observed today, and the ancient samples were intermingled with modern individuals throughout the reconstructed evolutionary tree. This suggests a temporal genetic continuity in Europe, where the mountain hares were able to keep pace with the rapid changes at the last glacial/interglacial transition and successfully track their shifting habitat to northern and alpine regions. Further, the temporal demographic analyses showed that the species’ population size in Europe appears to have been tightly linked with palaeoclimatic fluctuations, with increases and declines occurring during periods of global cooling and warming, respectively. Taken together, our results suggest that neither habitat shifts nor demographic fluctuations have had any substantial impact on the genetic diversity of European mountain hares. This remarkable resilience, which contrasts to a majority of previously investigated cold-adapted species, is likely due to its generalist nature that makes it less vulnerable to environmental changes.
AB - Throughout time, climate changes have caused substantial rearrangements of habitats which have alternately promoted and disfavoured different types of taxa. At first glance, the mountain hare (Lepus timidus) shows the typical hallmarks of a cold-adapted species that has retreated to refugia since the onset of the current Holocene interglacial. In contrary to expectations, however, the species has a high contemporary genetic diversity with no clear differentiation between geographically isolated populations. In order to clarify the phylogeographic history of European mountain hares, we here analysed ancient DNA from the glacial populations that inhabited the previous midlatitude European tundra region. Our results reveal that the Ice Age hares had similar levels of genetic variation and lack of geographic structure as observed today, and the ancient samples were intermingled with modern individuals throughout the reconstructed evolutionary tree. This suggests a temporal genetic continuity in Europe, where the mountain hares were able to keep pace with the rapid changes at the last glacial/interglacial transition and successfully track their shifting habitat to northern and alpine regions. Further, the temporal demographic analyses showed that the species’ population size in Europe appears to have been tightly linked with palaeoclimatic fluctuations, with increases and declines occurring during periods of global cooling and warming, respectively. Taken together, our results suggest that neither habitat shifts nor demographic fluctuations have had any substantial impact on the genetic diversity of European mountain hares. This remarkable resilience, which contrasts to a majority of previously investigated cold-adapted species, is likely due to its generalist nature that makes it less vulnerable to environmental changes.
KW - Ancient DNA
KW - Approximate Bayesian computation
KW - Climate change
KW - Coalescent simulations
KW - Glacial cycles
KW - Phylogeography
KW - Range shift
U2 - 10.1093/biolinnean/blw009
DO - 10.1093/biolinnean/blw009
M3 - Article
SN - 0024-4066
VL - 120
SP - 891
EP - 908
JO - Biological Journal of the Linnean Society
JF - Biological Journal of the Linnean Society
IS - 4
ER -