Landscape changes can alter population dynamics due to changes in the availability and spatial distribution of resources important to the species (Morrison et al. 1992, Wiens et al. 1993; Fahrig & Merriam 1994), changes in species interactions and the alteration of population dispersal patterns (Sutherland 1996; With & King 1999). Successful dispersal of individuals and establishment of populations in new areas are key factors in the dynamics of spatially structured populations as they influence the vulnerability of a population to local extinction (With & King 1999, Revilla et al. 2004).

Species response to landscape modifications is linked to two basic elements; the spatial structure of landscape disturbance and the individual movement pattern. The spatial configuration of the disturbance can be characterized for its shape and its aggregation. The shape defines, among other things, the area of habitat loss while the aggregation is related with the level of spreads in all the landscape. On the other hand, one basic characteristic of individual movement pattern is the longitude of displacement per time unit (e.g. day, month). The movement displacement is commonly greater in animals with larger home ranges than animals with smaller home ranges.     

The research objective was to explore the association between the shapes of the landscape disturbance and animal displacement over the animal population size. As anthropogenic modifications such as roads and towns were considering because they are important modifications in rural lands. These elements are characterized for their different shapes and aggregation. Roads represent a linear disturbance that generally is spread over the land while towns represent a spot disturbance that is aggregated within the landscape.  For animal displacement the study involves two Chilean native deer with different home ranges size. The home range size of these species differs in 10 times therefore it was assume that one has a large home range and the other a small home range.

It was hypothesized that species displacement and land modification, such as roads and towns, significantly affect the animal’s population size. The deer species with larger home ranges should be more affected than the deer species with smaller home ranges, because they have a greater probability encountering habitat alteration. On the other hand, it is expected that linear disturbance has a greater impact than spot disturbances on animals, because roads are disaggregated over the landscape so they affect a large area.