| Sumario: | A study was conducted to investigate how different types and degrees of landscape fragmentation interact with different possible dispersal modes to affect the movement of species. Using percolation theory as a base from which to extend simulations of the dispersal and migration of organisms across fragmented landscapes, simulations were made of ants in labyrinths on a gradient of fragmentation. Landscapes were created with three types of fragmentation pattern—uniform random, hierarchical, and fractal—and open-field and edge ants were studied. Findings revealed differences in the success rates among landscapes and between edge ants and open-field ants, and differences were also created by landscape pattern in rates of movement. It was concluded that the general rules derived from simulations can be used to identify landscapes that are near critical levels of fragmentation and will be sensitive in their response to small efforts at restoration or small levels of fragmentation. A method of solving problems that might arise in choosing a scale is considered.
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