Molar shape differentiation during range expansions of the collared lemming (Dicrostonyx torquatus) related to past climate changes.

• Published in: Quaternary Science Reviews
• Main Authors: Montuire, Sophie, Royer, Aurélien, Lemanik, Anna, Gilg, Olivier, Sokolova, Natalya, Sokolov, Aleksandr, Desclaux, Emmanuel, Nadachowski, Adam, Navarro, Nicolas
• Other Authors: École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL), Biogéosciences UMR 6282 (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Institute of Systematics and Evolution of Animals, Polish Academy of Sciences (PAN), Laboratoire Chrono-environnement (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC), Groupe de recherche en écologie arctique (GREA), Arctic Research Station of Institute of Plant and Animal Ecology, Ural Branch of Russian Academy of Sciences (UB RAS), Arctic Research Center of Yamal-Nenets Autonomous District, Laboratoire Départemental de Préhistoire du Lazaret (LDPL), Département des Alpes-Maritimes, Culture et Environnements, Préhistoire, Antiquité, Moyen-Age (CEPAM), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Funding from the National Science Centre, Poland, grant no: UMO-2017/25/B/NZ8/02005, from the French Polar Institute-IPEV (program “Interactions 1036”), by PRC CNRS Russia (program “ECCVAT”), and by the Russian Fund for Basic Research grants #18-05-60261 (Arctic) and #18-54-15013.
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2019
• Subjects: Geometric morphometrics; Collared lemmings; Climate; Range expansion; [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology; [SDV.BID]Life Sciences [q-bio]/Biodiversity; Arctic; Dicrostonyx torquatus
• Online Access: https://hal.science/hal-02271042; https://doi.org/10.1016/j.quascirev.2019.105886

12 pages International audience The genus Dicrostonyx (the collared lemming) is undoubtedly the small mammal best adapted to the extreme conditions of the arctic environment. The Palearctic collared lemming has been described in numerous European Late Pleistocene localities up to south of France and Croatia. This species experienced climate-driven changes through time, changes mainly observed as repetitive pulses of pan-continental migration, and it thus became a typical indicator of glacial conditions. Using geometric morphometrics on molars, we evaluate the shape changes occurring during the last 100 ky over some dispersal events in Western Europe. The results point out that Dicrostonyx torquatus has a large intra-population variation with a homogenous morphology, regardless of the origin of the individuals. A temporal trend leading to a more complex tooth with a differentiated anterior loop on the first lower molar was observed. An additional effect of the distance from the core populations was also described with a more peculiar shape for the most western populations of France. These temporal and geographical trends might relate to the different migratory pulses documented from ancient DNA haplotypes.