Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/1112
Título: Efeitos das limpezas do subcoberto nas comunidades de aves florestais mediterrânicas
Outros títulos: Effects of understorey clearing on Mediterranean forest bird communities
Autor: Santana, Joana Figueiredo
Orientador: Beja, Rui Pedro Correia de Oliveira
Palavras-chave: cork oak forests
fire risk
forest management
vegetation recover
fruit tracking
mosaic system
sobreirais
risco de incêndio
gestão florestal
recuperação da vegetação
frugivoros
sistema em mosaico
Data de Defesa: 2009
Resumo: The increased usage of mechanical understorey clearing in Mediterranean forests to reduce fire risk has consequences on biological communities that are poorly known. This issue was addressed using a chronosequence of 48 Quercus suber forest stands in southern Portugal, to estimate how vegetation and bird assemblages attributes change following clearing over about 70 years. This study showed that understorey clearing has long-lasting effects on vegetation structure and composition, as well as on bird assemblages, that lasted for at least 40-50 years. Recovery of tree richness lasted about 50 years. Shrubs started recovering immediately after clearing, with pioneer seeder species dominating understorey vegetation for about 20 years. Resprouter species recovered slowly for about 40-50 years. Both breeding and wintering bird assemblages were affected by clearing, with particularly strong effects on insectivorous and frugivorous species, mostly those associated with shrubs and trees. Results were stronger during winter when frugivores distribution appeared influenced by fruit tracking in old understorey forests. Vertical heterogeneity in old understorey stands was likely to be the key factor affecting bird distribution during spring. Management strategies for reducing fire risk should strive to maintain some stands with understorey older than about 50 years in order to conserve biodiversity repositories.
Descrição: Mestrado em Gestão de Recursos Naturais - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/1112
Aparece nas colecções:BISA - Dissertações de Mestrado / Master Thesis

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
Dissertacao_Mestrado_Santana, Joana F.(2009).pdf4,24 MBAdobe PDFVer/Abrir


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.