Arctic habitat and global changes, past and current variation of collared lemmings (Dicrostonyx) in margin of their natural range

Started in october 2019

Defended the 16 june 2023

Funding: École pratique des hautes études

Supervisors: Sophie Montuire and Aurélien Royer

Abstract

Lemmings are emblematic taxa of arctic environments. The cold phases of the Pleistocene allowed them to extend their distribution, so that they are present in both the European and American fossil record. This work aims to investigate the current and past diversity of three lemming genera (Dicrostonyx, Lemmus and Myopus) based on their molar morphology, allowing a direct comparison between modern and fossil populations. The study of the modern Nearctic Dicrostonyx populations highlighted some major biogeographic patterns partly caused by the history of the genus during the Upper Pleistocene. The investigations conducted on modern and fossil Lemmini populations caused a global revision of the group diversity in the European fossil record.

jury

Gloria Cuenca-Bescós, université de Saragosse – reviewer
Allowen Evin, ISEM – reviewer
Emmanuel Discamps, TRACES – examiner
Aude Lalis, MNHN – examiner
Benjamin Pohl, Biogéosciences – examiner
Aurélien Royer, Biogéosciences – supervisor
Sophie Montuire, Biogéosciences – supervisor

extrait:

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Arctic habitat and global changes, past and current variation of collared lemmings (Dicrostonyx) in margin of their natural range

Started in october 2019

Defended the 16 june 2023

Funding: École pratique des hautes études

Supervisors: Sophie Montuire and Aurélien Royer

 

Abstract

Lemmings are emblematic taxa of arctic environments. The cold phases of the Pleistocene allowed them to extend their distribution, so that they are present in both the European and American fossil record. This work aims to investigate the current and past diversity of three lemming genera (Dicrostonyx, Lemmus and Myopus) based on their molar morphology, allowing a direct comparison between modern and fossil populations. The study of the modern Nearctic Dicrostonyx populations highlighted some major biogeographic patterns partly caused by the history of the genus during the Upper Pleistocene. The investigations conducted on modern and fossil Lemmini populations caused a global revision of the group diversity in the European fossil record.

 

jury

Gloria Cuenca-Bescós, université de Saragosse - reviewer
Allowen Evin, ISEM - reviewer
Emmanuel Discamps, TRACES - examiner
Aude Lalis, MNHN - examiner
Benjamin Pohl, Biogéosciences - examiner
Aurélien Royer, Biogéosciences - supervisor
Sophie Montuire, Biogéosciences - supervisor

titre_these:

Habitat arctique et changement global, variation actuelle et fossiles des lemmings du genre Dicrostonyx en marge d’aire de répartition

date_de_debut_these:

octobre 2019