Avaliação do impacto da alteração do regime de distúrbios no processo de invasão biológica através da modelagem matemática

Abstract

The disturbance occurrences resulting in habitat destruction and fragmentation can limit the species’ movement on the landscape and facilitate the introduction of invasive species with high competitive abilities. The biological invasion can reduce the native species diversity when native species present low fitness to explore different patch qualities on the post-disturbance landscape. However, the coexistence of native and invasive species can be possible when species respond differently to changes in patch qualities through to disturbs/restoration events on habitats of the landscape. Using mathematical modeling as an analytic tool, this present study has the following aims: (i) to evaluate the impact of different degrees of fragmentation and spatial patterns of disturbance occurrence on landscape on the probability of establishment of invasive species, coexistence or native species displacement; (ii) to evaluate the occupation and distribution of species across the landscape, given different times and intensity of habitat restoration after disturbances have occurred and (iii) to evaluate the role of dispersion in the biological invasion process, that is, in the colonization and establishment of the invasive species.