Metacommunities in Dynamic Landscapes How seasonality affects biodiversity

ALEJANDRO F. ROZENFELD

Venecia

Workshop; Stochastic models in ecology and evolutionary biology; 2018

Model.Population dynamics follows a Zero-Sum game on landscapes whose sites are saturated with individuals.Death individuals are replaced by new individuals of the same or another species, from a site within the network (μ), from a regional species pool (ν), or from the same site (λ = 1 − μ − ν).In the limit of a large number of individuals per site, both local (α) and global (γ) diversity get to steady state.Dynamic landscapes are modeled using 2D Random Geometric Graphs (RGG).Results.In landscapes with low connectivity (below percolation), global diversity (γ) is high while local diversity (α) is low. The major contribution to species richness comes from speciation (ν).In landscapes with high connectivity (above percolation), global diversity (γ) is low while local diversity (α) is high. The major contribution to species richness comes from migration (μ).Seasonal dynamics introduces feedback between endogenous (ν and μ) and exogenous factors (A and ω). α and γ diversity are respectively in synchrony and asynchrony with landscape connectivity.