IUCN / SSC Cat Specialist Group - Digital Cat Library |
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| Spinola, C.M. | |
| Influˆncia dos padräes estruturais da paisagem na comunidade de mam¡feros terrestres de m‚dio e grande porte na RegiÆo do Vale do Ribeira, Estado de SÆo Paulo | |
| 2008 Full Book | |
Studies establishing relationships among biological data and spatial patterns have contributed to the understanding of ecological phenomena at regional and local scales, even that, little is known about these phenomena. The approach adopted in this study is focused to an ecological interpretation of the landscape, in order to understand the behavior of the species in relation to its structure. The studied landscape is composed of several natural and anthropic elements, such as _Eucalyptus _plantations and Seasonal Semideciduous Forests, being a determining factor in the composition and spatial distribution of the species in the landscape. The main objective of this study was to evaluate the structural relationship of the landscape and the behavior of species that compose the community of medium and large terrestrial mammals, in the Vale do Ribeira region, State of SÆo Paulo, Brazil. These species were evaluated through systematic surveys, known as "sand plots", and the landscape structure was characterized by geoprocessing techniques. Yet, from the center of each sampling row, a delimitation of the landscape was done, with 1000 meters in radius, denominated influence zones. From field observations, a great richness of species was verified, totaling 19 species. From these, 17 species were found in Seasonal Semideciduous Forests landscape and 11 species in _Eucalyptus _landscape, which made it possible to verify some similarity in the species occurrence among the sampled environments. Through structure analysis, using landscape metrics, the characterization of influence zones was made. Once obtained the information concerning the biological data and landscape data, a multiple logistic regression analyses was performed, when it was verified the prediction power of the environmental variables in relation to some species of the studied community. Individually, no environmental variable could explain the probability of species occurrence, but when used together, the prediction power was significant for _Leopardus _sp., _Didelphis albiventris _(opossum), _Nasua nasua _(coati) and _Sylvilagus brasiliensis _(tapiti). Using prediction models for key-species, whether in natural or anthropic environments, is highly recommended, as the conservation of other species can be directly linked. Therefore, studies on conservation focusing on communities and not only in populations are interesting, because they may cover different species with different requirements. The configuration of the landscape, taken from the influence zones, can be a representative sample of the landscape as a whole, helping in the actions for the conservation of the species with greatest ecological requirements. |
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