Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/6156
Título: Os efeitos da intensificação agrícola na comunidade de aves das estepes cerealíferas
Outros títulos: Effects of agricultural intensification on steppe bird populations
Autor: Delgado, Ana Margarida dos Santos
Orientador: Moreira, Francisco Manuel Ribeiro Ferraria
Fabião, António Manuel Dorotêa
Palavras-chave: steppe bird population
agricultural intensification
landscape dynamics
cereal steppes
Tetrax tetrax
fallows
cereal fields
vegetation structure
food availability
inter-anual variations
Data de Defesa: 2013
Editora: ISA
Citação: Delgado, A.M.S. - Os efeitos da intensificação agrícola na comunidade de aves das estepes cerealíferas. Lisboa: ISA, 2013, 271 p.
Resumo: This study evaluates the agricultural intensification effects on steppe bird populations of cereal fields and fallows. Through the analysis of landscape dynamics between 2002–2011, a gradient of agricultural intensification was identified in selected areas of Baixo Alentejo. In cereal fields, total bird abundance of steppe and resident birds decreased along the intensification gradient. During the breeding season, this trend should be related to an increase in height and density of vegetation structure in intensive areas. Food availability is not influenced by intensification. In extensive areas, the bird abundance is influenced by differences associated to the type of cereal and vegetation structure. In fallows, the abundance of steppe and resident birds is affected by intensification. Wintering and breeding species are influenced by fallow age and livestock presence. The multi-scale analysis of local management and landscape composition effects on steppe bird community in cereal fields showed that local component is more important in winter. In fallows, both components are equally important for steppe bird community. Between-year variations (2002-2008) in Tetrax tetrax population densities were shown to be influenced by agricultural intensification and rainfall
Descrição: Doutoramento em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/6156
Aparece nas colecções:BISA - Teses de Doutoramento / Doctoral Thesis

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