The Alpine Marmot Project

Welcome to the Alpine Marmot Project

Vérane Berger

espace

PhD – Université Claude-Bernard – Lyon1 2012 – 2015

Assistant lecturer – Université Claude-Bernard – Lyon1 2015 – 2016

e-mail: verber@utu.fi

Projects

Senescence is defined as the decline of an individual’s performance with age. Over the past two decades, a large number of empirical studies have provided evidence that the senescence phenomenon is widespread in wild animal populations.

In species living in social groups (often family), non-breeding adults help dominants to raise young. In 1992, Crick proposed that the dominant could benefit from the help of subordinates and thus could reduce their own investment in reproduction. The cost of reproduction being reduced, one can expect that the presence of helpers affects the pattern of senescence. So the social context can potentially have an influence on senescence either by removing, delaying or reducing its intensity. Nevertheless, there has been very little study on the effect of sociality on the pattern of senescence.

My thesis project focuses on three questions:

1) Quantify the age of onset of senescence in survival and reproduction, and its intensity.

2) Evaluate the influence of social factors (composition of the social group and its variations) on the pattern of senescence.

3) Conduct a comparative study in order to identify differences in the pattern of senescence with the gradient of sociality.

Fundings

Bourse de thèse UCB (2012 – 2015)

EU Horizon2020 ERC-2014-CoG 648766 / Virpi Lummaa

Publications

Berger, V., Lemaître, J. F., Allainé, D., Gaillard, J. M., and Cohas, A. (2018). Early and Adult Social Environments Shape Sex-Specific Actuarial Senescence Patterns in a Cooperative Breeder. The American Naturalist, 192:525-536. pdf

Tidière M., Gaillard JM., Berger V., Muller DW., Bingaman Lackey L., Gimenez O., Clauss M., Lemaître JF. (2016) Comparative analyses of longevity and senescence reveal variable survival benefits of living in zoos across mammals. Scientific reports, 6:36361.

Berger V., Lemaître JF., Dupont P., Allainé D., Gaillard JM. and Cohas A. (2016) Age-specific survival in the socially monogamous alpine marmot (Marmota marmota): evidence of senescence. Journal of Mammalogy, 97:992–1000. pdf

Gaillard JM., Berger V., Clauss M., Duncan P., Muller D., Tidière M. & Lemaître JF. (2015) Does tooth wear allow predicting aging: a comparative study across large herbivores. Experimental Gerontology, 71:48–55.

Gaillard JM., Lemaître JF., Berger V., Bonenfant C., Devillard S., Douhard M., Gamelon M., Plard F. & Lebreton JD. (2016) Axes of variation in life histories. In Encyclopedia of Evolutionary Biology, RM Kliman (Ed.). Elsevier, 312-323.

Berger V., Lemaître JF., Allainé D., Gaillard JM. & Cohas A. (2015) Early and adult social environments have independent effects on individual fitness in a social vertebrate. Proceedings of Royal Society B, 282:20151167. pdf

Berger V., Lemaître JF., Gaillard JM. & Cohas A. (2015) How do animals optimize the size-number trade-off when aging? Insights from reproductive senescence patterns in marmots. Ecology, 96:46-53. pdf

Lemaître JF., Berger V., Bonenfant C., Douhard M., Gamelon M., Plard F., Gaillard JM. (2015) Early-late life trade-offs and the evolution of ageing in the wild. Proceedings of Royal Society B, 282:20150209.

Thesis

Berger V. (2015) Senescence and sociality: The exemple of the Alpine marmot (Marmota marmota). Thèse de doctorat. Université Claude Bernard Lyon 1, Lyon. pdf

Conferences

Berger V. (2015) Senescence and sociality in the Alpine marmots. European workshop on Alpine marmot. Gran Paradiso National Park. Valsavarenche, Italie, 17-18 October. Communication orale.

Berger V., Lemaître JF., Gaillard JM. & Cohas A. (2014) How do animals optimize the size–number trade-off when aging? Insights from reproductive senescence patterns in marmots. British Ecological Society à Lille, 9-12 Décembre. Communication orale.

Berger V., Bonenfant C., Douhard M., Gaillard JM. & Plard F. (2013) Body mass trajectory of two roe deer (Capreolus capreolus) populations: the effect of sex. French Society for Animal Behavior Study. Dijon, 19-21 Novembre. Communication orale.

Seminars

Berger V. (2016) Senescence and sociality in the Alpine marmot. Université de Turku, Finlande, 15 Novembre.