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Title: Habitat connectivity for carnivores in mediterranean landscapes
Author: Grilo, Clara Bentes, 1972-
Advisor: Reis, Margarida Santos, 1955-
Bissonette, John A.
Keywords: Montado
Modelação ecológica
Teses de doutoramento
Defense Date: 2009
Abstract: The goal of this thesis is to provide sound information related to humaninduced landscape changes on the Portuguese carnivore guild. More specifically, it addresses at what scale(s) extent(s) did carnivores appear to respond to fragmentation; which are the patterns of carnivore vehicle collisions and their causes; how carnivores respond to highways culverts and underpasses; and which is the relationship between montado connectivity and carnivore mortality. Stone martens were the most sensitive species to montado attributes and fragmentation, although mongoose movement may be limited to shorter distances when landscape connectivity is low. Roads, on the other hand, appear to be selectively permeable and may act as filters to movement. On average, 47 carnivores/100 km/year were road-killed, with red fox suffering the highest mortality. Some species were more vulnerable during specific life history periods (e.g., provisioning young, dispersal, and breeding) and the major contributions to the deadliest segment roads were road sinuosity, suitable habitat, and low human disturbance. This study documented the regular use by most carnivores (0.7 ind./crossing structure/day) except weasels, polecats and wildcats that appeared to avoid passages. In general, carnivores preferred larger passages with vegetation close to the entrances, favourable habitat in the vicinity, and low human disturbance. This study also showed that the likelihood of stone marten occupancy decreased with distance to source areas and increased with patch size. We found an increased cost attributable to open areas and distance to riparian areas. Results presented show that common and wide-ranging species also suffer the effects of habitat fragmentation, and montado restoration efforts, as well as, road mitigation measures are required to restore habitat connectivity in the area and ensure long-term sustainability of a diverse carnivore guild. Further research is however needed to clarify the regional status of less common species and to disentangle the cumulative effects of population density, demography and behavior.
Resumo alargado em português disponível no documento
Description: Tese de doutoramento, Biologia (Biologia da Conservação), 2009, Universidade de Lisboa, Faculdade de Ciências
Appears in Collections:FC - Teses de Doutoramento

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