Séminaire AMAP - Résultats & Programmes

ecophylo: Simulating and assessing eco-evolutionary dynamics under past environmental changes in Python

17/06/2022 de 11h00 à 12h00PS 2 salle 201

While ecology addresses the coexistence and dynamics of species depending on their adaptations to their environment at present, evolution addresses the appearance-disappearance of species and the changes in their characters over a longer term and a large spatial scale. A major challenge is to bridge the gap between ecological and evolutionary models, in order to address eco-evolutionary dynamics. Specifically, past environmental changes have determined changing regimes of population and migration dynamics, yet existing approaches do not allow investigating the long-term influence of such historical changes on extant biodiversity patterns.
In this talk I would like to introduce a new modelling approach (and associated Python package): ecophylo, dedicated to coalescent-based simulation of neutral eco-evolutionary dynamics. The model rests on coalescent theory to simulate a shared ancestry of co-occurring individuals, under the influence of past demographic fluctuations due to, for example, habitat fluctuations, fragmentation and/or migration events among separate areas. Mutations occur over time in the genealogy, and divergent genotypes represent distinct extant species.
Then I will illustrate how this package can be used to explore the remnant influence of past habitat reduction and subsequent expansion using an in silico experiment. More specifically how parameters controlling the demography of assemblages in the past – under the effect of habitat reduction and subsequent expansion - affects patterns of taxonomic, phylogenetic and functional diversity.