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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/3325

Title: How important is the availability of food resources for breeding birds at montados ? Exploring bird-arthropods relationships on a Mediterranean landscape
Authors: Pereira, Pedro Miguel Filipe
Advisor: Rabaça, João Eduardo Morais Gomes
Simões, Manuela Rodrigues Branco
Keywords: birds
arthropods
pest outbreaks
montado
Issue Date: 2010
Publisher: ISA
Abstract: The management practices of Mediterranean oak systems can enhance their susceptibility to insect outbreak. At these habitats the insectivorous bird species are dominant within the breeding community. Accordingly, we aimed to assess the importance of arthropod community for breeding birds and identify which species may be related with insect outbreak (defoliator and buprestid beetles) at central Portugal in montado systems dominated by Cork Oaks Quercus suber. We used variance partition to determine the relevance of three environmental variable groups for birds: arthropod community, vegetation characteristics and management practices. As a result, arthropods presented the highest pure effect with 11.24% of variance explained from a total of 61.20%. Bird-arthropod relationships were direct when associated with a potential-prey or indirect mostly when dependent on a breeding site selection. Thereafter, linear regression was used for pest insect modeling in function of bird community parameters. The obtained regression coeficients indicated that Great Tit Parus major, alone or with other foliage-dwelling birds, and Short-toed Treecreeper Certhia brachydactyla were potential predators of defoliator insects. Whereas the Lesser Spotted Woodpecker Dendrocopos minor appeared to be an indicator of Buprestid outbreak. Consequently, the protection of hole-nesting birds can improve the conservation of oak habitats
Description: Mestrado em Gestão e Conservação de Recursos Naturais - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/3325
Appears in Collections:BISA - Dissertações de Mestrado / Master Thesis

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