Encontrados 6 documentos, a visualizar página 1 de 1
Influence of Land Mosaic Composition and Structure on Patchy Populations: The C...
Pita, Ricardo; Mira, António; Beja, PedroThe ability of patchy populations to persist in human-dominated landscapes is often assessed using focal patch approaches, in which the local occurrence or abundance of a species is related to the properties of individual patches and the surrounding landscape context. However, useful additional insights could probably be gained through broader, mosaic level approaches, whereby whole land mosaics with contrastin...
Revisión a nivel ibérico de la distribución del topillo de Cabrera o iberón, Ib...
Garrido-Garcia, José; Rosário, Inês; Gisbert, Julio; García-Perea, Rosa; Cordero, Ana Isabel; López-Alabau, Antonio; Mathias, Maria da LuzNeste estudo é apresentado um mapa de quadrículas UTM 10x10 km para toda a área de distribuição de Iberomys cabrerae. A partir dos dados obtidos destacamos que a) as 420 quadrículas com dados se concentram em 4 grandes núcleos disjuntos (Luso-Carpetano, Montibérico, Bético y Prepirenaico), das quais o mais importante é o Luso-Carpetano e o mais pequeno, isolado e ameaçado é o Preirenáico; b) é necessário intens...
Assessing habitat differentiation between coexisting species: The role of spati...
Pita, Ricardo; Mira, António; Beja, PedroAlthough the importance of spatial scale for understanding habitat selection patterns and processes has long been recognized, little is known about its impact on the identification of habitat differentiation between sympatric species, despite its likely utility in assessing niche partitioning and thus explaining species coexistence. Here we used radio-telemetry data to examine seasonal habitat selectio...
Circadian activity rhythms in relation to season, sex and interspecific interact...
Pita, Ricardo; Mira, António; Beja, PedroAlthough environmental conditions and biotic interactions are widely recognized as key sources of variation in circadian activity rhythms of a broad array of vertebrates, information on their actual signi fi cance outside experimental settings remains scarce. We investigated changes in circadian activity rhythms of free-ranging Cabrera voles, Microtus cabrerae, and water voles, Arvicola sap...
Spatial segregation of two vole species (Arvicola sapidus and Microtus cabrerae...
Pita, Ricardo; Mira, António; Beja, PedroSpatial segregation is one of the common mechanisms allowing the co-existence of similar interacting species in heterogeneous environments. Analysing spatial segregation requires information on individual home-range sizes and their degree of spatial overlap. In this study, we used radio-tracking to report for the first time the home- range and core-area sizes of sympatric Cabrera and water voles and to ...
Influence of landscape characteristics on carnivore diversity and abundance in M...
Pita, Ricardo; Mira, António; Moreira, Francisco; Morgado, Rui; Beja, PedroPredation is increasingly pointed out as one of the factors contributing to population declines of ground-nesting farmland birds, though it remains poorly understood how ongoing transformations of agricultural landscapes affect predator assemblages. This study addressed this issue, estimating the contribution of landscape composition and configuration to spatial variation in species richness and abundan...
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