Linking animal movement to plant population dynamics. Models in Population Dynamics and Ecology

MORALES, JUAN M.

Congreso; Models in Population Dynamics and Ecology 2010: Animal Movement, Dispersal and Spatial Ecology; 2010

The consequences of dispersal, whether ecological or evolutionary, would be almost inevitable mediated by its effects on the spatial distribution of individuals. For example, relatively short dispersal distance increases spatial aggregation of plants and hence competition, which could translate into negative population growth. Spatially explicit models of plant dynamics usually assume that a particular dispersal kernel applies to all plants in a population. However, empirical and theoretical studies show that the spatial configuration of individual plants can affect both fruit removal rate and the characteristics of kernels when fruit-eating animals (frugivores) are the dispersal agents. We present results from simulations of frugivore-dispersed plant dynamics and observational studies of Thrushes (Turdus spp) foraging for fruits to show how frugivore behaviour can have an important role in determining the dynamics of plant spatial distribution and abundance. Simulated plant dynamics showed increased clustering and smaller population sizes as dispersing agents were less willing to move larger distances while foraging. This tendency was further modulated by how selective animals were. Furthermore, the distribution of perches in the landscape had dramatic consequences on bird space use which translated to plant dynamics.