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Louis Arbez PhD thesis

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

Started in october 2019

Funding: École pratique des hautes études

Supervisors: Sophie Montuire and Aurélien Royer

 

Collared lemmings (Dicrostonyx sp.) are key species in arctic ecosystems. They are at the same time the most important primary consumers and the main prey for many predators (arctic fox, skua, stoat, snowy owl) they play a major role in the trophic web of these environments. Being specifically adapted to polar environments, they are deeply impacted by global warming and climate change at different timescale. My objective is to measure the impact of climate changes on collared lemming, focusing on Pleistocene/Holocene transition (11 000 BP) and on current global warming. I’m specifically interested my changes in cranio-dental morphology but also on ecological niche change related to other environmental factors sur as vegetation cover, presence of competitive species (biotic factors) or the quality of snow cover, temperature or humidity (abiotic factors). Doing that I need to combine several different methods, mainly geometric morphometrics, geochemistry, dental microwear features of fluctuating asymmetry.

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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

Funding: École pratique des hautes études

Supervisors: Sophie Montuire and Aurélien Royer

 

Collared lemmings (Dicrostonyx sp.) are key species in arctic ecosystems. They are at the same time the most important primary consumers and the main prey for many predators (arctic fox, skua, stoat, snowy owl) they play a major role in the trophic web of these environments. Being specifically adapted to polar environments, they are deeply impacted by global warming and climate change at different timescale. My objective is to measure the impact of climate changes on collared lemming, focusing on Pleistocene/Holocene transition (11 000 BP) and on current global warming. I’m specifically interested my changes in cranio-dental morphology but also on ecological niche change related to other environmental factors sur as vegetation cover, presence of competitive species (biotic factors) or the quality of snow cover, temperature or humidity (abiotic factors). Doing that I need to combine several different methods, mainly geometric morphometrics, geochemistry, dental microwear features of fluctuating asymmetry.

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

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