Research

Understanding the patterns and the processes underlying current diversity

img3My PhD focuses on the factors of diversification in mammals and birds. We know that biotic and abiotic variables may favor or constrain diversification processes. My aim is to define the major variables of interest acting on mammals and birds evolution.
In the first part of my PhD, I have been mainly focused on the influence of latitude and abiotic variables on diversification. Diversification rates (speciation rates and extinction rates) may vary between tropical and temperate regions and studying this difference with both new methods and new phylogenies may help our understanding of the still unexplained latitudinal diversity gradient.
I’m also interested in using existing phylogenetic methods, such as correlative or character-dependent methods, to help current conservation in a context of global change.

See Rolland et al. 2015 GEB, Rolland et al. 2014 Plos Biol, Rolland et al. 2014 PRSB, Condamine et al. 2013 Ecol Lett for more references.

Describing how genetic adaptation is distributed in the ecological niche of alpine plants

img2During my master degree, I’ve been particularly interested in studying how measures of the ecological niche, such as marginality (i.e. the environmental distance from the mean preferences of a species), might be correlated with local adaptation to “extreme conditions” in alpine plants. First, I used correlative approaches (i.e. GLM, GEE) to detect whether particular loci were associated with environmental variables. Then, we looked at how the adaptive loci were distributed in the ecological niche.

See Rolland et al. 2015 PPEES and Joost et al. 2013 Mol Ecol for more references.