Context Maintaining connectivity in landscapes where natural ecosystems are quickly replaced by human land-uses is a challenge. To reduce the effects of habitat loss, ecological corridors have been proposed as a relevant tool for landscape planning. Objective We aimed to develop a spatial model to identify and prioritize riparian corridors to improve landscape connectivity. Methods The model considers the effect of the landuse/cover types and remaining forests on the movement capacity of a focal species sensitive to fragmentation. Since landscape elements act as barriers or promoters to ecological fluxes, suitability values were set according to the element's ability in providing habitat. The model recognizes the effect of the contact between associated elements along the riparian corridor's width and length and corrects their suitability. These procedures enabled the calculation of the Utility Factor, resulting in a measure of the quality of the corridor. ResultsThe results show that the model assists the identification of the riparian corridor's sections where connectivity is hampered and management efforts are required to maintain landscape connectivity. In addition, it can be applied to select the corridors dominated by large forests, which could be designed for conservation purposes. The two study cases evidence that the model is flexible, adjustable to distinct landscapes, and the decision-maker's objectives. Conclusions We concluded that the proposed strategy helps decision-makers to prioritize the territories for managing or preserving connectivity. Finally, the method provides quantitative information that would not be perceived by just interpreting land-use/cover maps.
AgradecimentosÀ minha orientadora prof. Drª Rozely Ferreira do Santos por mais do que nos orientar mas, por ser uma das poucas pessoas realmente capazes de ensinar.Ao CNPq pelo suporte financeiro necessário para a realização deste projeto.À SABESP por fornecer as imagens IKONOS sem as quais este trabalho não seria possível, em especial agradeço a disposição do Álvaro Fernades Jr. À prof. Drª Franklina M. B. de Toledo e ao Engenheiro Leandro Mattiolli pela parceria na elaboração do algoritmo baseado no método de Floyd-Warshall, pela paciência e em especial a Fran por estar sempre pronta a ajudar e a ensinar. À Sueli Thomaziello pela colaboração e apoio na elaboração do projeto de pesquisa.Aos meus pais e irmã que me trouxeram até aqui e me sustentaram com conselhos, amor e apoio, em especial ao me pai que esteve muito presente em todo este processo.Aos meus colegas do LAPLA, que nesses anos se tornaram uma família para mim. Aos meus queridos amigos que me apoiaram e estiveram sempre presentes:
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