Encontrados 10 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...
Relative Effects of Road Risk, Habitat Suitability, and Connectivity on Wildlif...
Santos, Sara; Lourenço, Rui; Mira, António; Beja, PedroBackground: Despite its importance for reducing wildlife-vehicle collisions, there is still incomplete understanding of factors responsible for high road mortality. In particular, few empirical studies examined the idea that spatial variation in roadkills is influenced by a complex interplay between road-related factors, and species-specific habitat quality and landscape connectivity. Methodology/Principal Find...
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 ...
Does afforestation increase bird nest predation risk in surrounding farmland?
Reino, Luis; Porto, Miguel; Morgado, Rui; Carvalho, Filipe; Mira, António; Beja, PedroAfforestation of agricultural land is increasingly used to deliver environmental benefits, but their effects on biodiversity remain poorly understood. This paper tests the hypothesis that afforestation changes predation processes in surrounding farmland, examining how the characteristics and landscape context of forest plantations affect predator (birds and mammalian carnivores) and key prey (rabbits and hares) ...
Effects of changed grazing regimes and habitat fragmentation on Mediterranean g...
Reino, Luís; Porto, Miguel; Morgado, Rui; Moreira, Francisco; Fabião, António; Santana, Joana; Delgado, Ana; Gordinho, Luís; Cal, João; Beja, PedroIn Iberian cereal-steppes, decoupling of payments from current production levels through the Single Farm Payment raised concerns regarding the potential for land abandonment and replacement of sheep by cattle, with eventual negative consequences for declining grassland birds. This study addressed this issue by analysing the responses of five grassland bird species of conservation concern to spatial land use gra...
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...
Distance to edges, edge contrast and landscape fragmentation: interactions affe...
Fabião, António; Reino, Luís; Osborne, Patrick E.; Beja, Pedro; Morgado, Rui; Rotenberry, John T.Afforestation often causes direct habitat losses for farmland birds of conservation concern, but it is uncertain whether negative effects also extend significantly into adjacent open land. Information is thus required on how these species react to wooded edges, and how their responses are affected by edge and landscape characteristics. These issues were examined in Mediterranean arable farmland, using bird coun...
MAMÍFEROS. Livro Vermelho dos Vertebrados de Portugal.
Queiroz, Ana Isabel; Mira, António; Barroso, Inês; Palmeirim, Jorge; Freitas, Luís; Rodrigues, Luisa; Fernandes, Margarida; Santos-Reis, MargaridaAtribui o estatutao de ameaça da UICN para Portugal, a todas as espécies de mamíferos ocorrentes no nosso país.
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