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On the origin of the Norwegian lemming
Stockholm University, Faculty of Science, Department of Zoology. Swedish Museum of Natural History, Sweden.
Stockholm University, Faculty of Science, Department of Zoology. Swedish Museum of Natural History, Sweden.
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2014 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 23, no 8, 2060-2071 p.Article in journal (Refereed) Published
Abstract [en]

The Pleistocene glacial cycles resulted in significant changes in species distributions, and it has been discussed whether this caused increased rates of population divergence and speciation. One species that is likely to have evolved during the Pleistocene is the Norwegian lemming (Lemmus lemmus). However, the origin of this species, both in terms of when and from what ancestral taxon it evolved, has been difficult to ascertain. Here, we use ancient DNA recovered from lemming remains from a series of Late Pleistocene and Holocene sites to explore the species' evolutionary history. The results revealed considerable genetic differentiation between glacial and contemporary samples. Moreover, the analyses provided strong support for a divergence time prior to the Last Glacial Maximum (LGM), therefore likely ruling out a postglacial colonization of Scandinavia. Consequently, it appears that the Norwegian lemming evolved from a small population that survived the LGM in an ice-free Scandinavian refugium.

Place, publisher, year, edition, pages
2014. Vol. 23, no 8, 2060-2071 p.
Keyword [en]
speciation, extinction, ancient DNA, colonization, Pleistocene, Lemmus
National Category
Biochemistry and Molecular Biology Developmental Biology Zoology
Research subject
Systematic Zoology
Identifiers
URN: urn:nbn:se:su:diva-103287DOI: 10.1111/mec.12698ISI: 000333858200014OAI: oai:DiVA.org:su-103287DiVA: diva2:718082
Note

AuthorCount:10;

Available from: 2014-05-19 Created: 2014-05-12 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Animal movement on short and long time scales and the effect on genetic diversity in cold-adapted species
Open this publication in new window or tab >>Animal movement on short and long time scales and the effect on genetic diversity in cold-adapted species
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The genetic diversity in modern species is strongly affected by contemporary gene flow between populations, which in turn is governed by individual dispersal capacities and barriers in the landscape. However, current patterns of variation have also been shaped by movement over longer time-scales, such as the successive shifts in species distributions that have occurred during past climate changes. This thesis is focused on cold-adapted species, and one parameter that has greatly influenced their current genetic diversity is how they coped with climate warming at the last glacial/interglacial transition, ca 11.7 thousand years ago. I examined this in three different small herbivore taxa; true lemmings (Lemmus), ptarmigan (Lagopus) and hares (Lepus), whose modern distributions stretch from the exposed tundra to the subarctic moorlands and taiga. In the first paper, I investigated contemporary genetic structure in the cyclic Norwegian lemming (Lemmus lemmus) and proposed that mass movements during peak years act as pulses of gene flow between mountain areas, which homogenise the gene pool over surprisingly vast geographic distances. However, when I used ancient DNA to analyse the lemmings’ ability for long-term directional movement, I found that the Ice Age populations that inhabited the former midlatitude European tundra-steppe appear to have been incapable of shifting their distribution northwards following post-glacial climate warming. Instead, the results suggest that the endemic Norwegian lemming descends from an isolated population that survived the last glacial maximum in situ in a restricted ice free refugium. In contrast to the glacial lemmings, as well the majority of previously studied mammals, the ptarmigan (L. lagopus and L. muta) and hare (L. timidus) analyses revealed a long-term genetic continuity in Europe, where the midlatitude populations were able to keep pace with the rapidly changing climate at the last glacial/interglacial transition, enabling them to shift their ranges to northern and high-alpine regions. These different outcomes might be explained by ptarmigans’ flight capability that allows a less restricted dispersal across fragmented landscapes, and that the generalist nature of mountain hares makes them less vulnerable to habitat alterations. Species distribution modelling, however, indicated that continued climate warming will make some isolated regions unsuitable in the future, thereby forcing populations to adapt the new environmental conditions in order to avoid local extinctions.

Place, publisher, year, edition, pages
Stockholm: Department of Zoology, Stockholm University, 2016. 45 p.
National Category
Zoology
Research subject
Systematic Zoology
Identifiers
urn:nbn:se:su:diva-129132 (URN)978-91-7649-421-9 (ISBN)
Public defence
2016-06-10, Vivi Täckholmsalen, NPQ-huset, Svante Arrhenius väg 20, Stockholm, 13:00 (English)
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Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2016-05-18 Created: 2016-04-15 Last updated: 2017-05-18Bibliographically approved

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Lagerholm, Vendela K.Sandoval-Castellanos, EdsonAngerbjörn, Anders
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