MONDAY, April 11, 2005
10:00 a.m. - 11:00 p.m.
GSB 711

Dr. Javier Gamarra
Department of Natural Resources
Cornell University

Critical foraging in fragmented fractal landscapes

Habitat fragmentation plays a crucial role in shaping the structure and equilibria of populations. In this seminar I will define how non-random habitat fragmentation may hinder the appearance of critical thresholds in the dynamic behavior of foraging populations. In some cases, foraging strategies seem to suddenly shift at some specific threshold in the habitat continuum. In others, the fractal nature of the landscape may instead practically involve the elimination of critical extinction thresholds. Many of these results deviate from previous studies based on implicit spatial characterization of landscapes. But yet, sometimes we will be able to include simple parameters representing the spatial texture of habitat in order to accurately predict population equilibria.