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Population dynamics of Arabis alpina in the French Alps: evidence for demographic compensation?

Marco Andrello, Pierre De Villemereuil, Delphine Busson, Oscar Gaggiotti, Irène Till-Bottraud
doi: https://doi.org/10.1101/070847
Marco Andrello
1CEFE UMR 5175, CNRS - Université Paul-Valéry Montpellier - EPHE, Laboratoire Biogéographie et Écologie des Vertébrés, 1919 Route de Mende, 34293 Montpellier CEDEX 5, France
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Pierre De Villemereuil
2Laboratoire d’Ecologie Alpine (LECA), University of Grenoble Alpes, F-38000 Grenoble, France; CNRS, LECA, F-38000 Grenoble, France
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Delphine Busson
2Laboratoire d’Ecologie Alpine (LECA), University of Grenoble Alpes, F-38000 Grenoble, France; CNRS, LECA, F-38000 Grenoble, France
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Oscar Gaggiotti
2Laboratoire d’Ecologie Alpine (LECA), University of Grenoble Alpes, F-38000 Grenoble, France; CNRS, LECA, F-38000 Grenoble, France
3Scottish Oceans Institute, University of St Andrews, Fife, KY16 8LB, United Kingdom
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Irène Till-Bottraud
2Laboratoire d’Ecologie Alpine (LECA), University of Grenoble Alpes, F-38000 Grenoble, France; CNRS, LECA, F-38000 Grenoble, France
4Université Clermont Auvergne, Université Blaise Pascal, GEOLAB, BP 10448, F-63000 Clermont-Ferrand, France; CNRS, UMR 6042, GEOLAB, F-63057 Clermont-Ferrand, France
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Summary

  • Due to its genetic proximity with Arabidopsis thaliana, Arabis alpina (Brassicaceae) is increasingly used as a perennial model species in studies of molecular evolution and adaptation.

  • We studied the demography of A. alpina in six natural sites widely differing in their degree of disturbance, slope and vegetation, and encompassing the full altitudinal range of the species.

  • We estimated three vital rates (growth, reproductive effort and survival) for individually-marked plants, studied for six years (2008-2014). We characterized the thermic conditions of each site with different thermal variables obtained using in situ continuous-time data loggers.

  • Although A. alpina is described as a perennial species, the average life expectancy was only 1.82 years and most plants died before setting seeds. Plant size was a strong predictor of all three vital rates.

  • Mean daily temperature showed a positive effect on growth and a negative effect on survival. Furthermore, reproductive effort covaried negatively with survival, suggesting a mechanism of demographic compensation acting on an elevational gradient.

  • Synthesis. These results are informative of the selective pressures experienced by A. alpina in natural conditions and will help design experimental and molecular studies of local adaptation in this species.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted August 22, 2016.
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Population dynamics of Arabis alpina in the French Alps: evidence for demographic compensation?
Marco Andrello, Pierre De Villemereuil, Delphine Busson, Oscar Gaggiotti, Irène Till-Bottraud
bioRxiv 070847; doi: https://doi.org/10.1101/070847
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Population dynamics of Arabis alpina in the French Alps: evidence for demographic compensation?
Marco Andrello, Pierre De Villemereuil, Delphine Busson, Oscar Gaggiotti, Irène Till-Bottraud
bioRxiv 070847; doi: https://doi.org/10.1101/070847

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