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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/605

Title: The influence of forest landscape composition and structure on spider communities in Mafra (Portugal) and Hamsterley forest (England, United Kingdom)
Other Titles: A influência da composição e estrutura da floresta nas comunidades de aranhas em Mafra (Portugal) e na floresta de Hamsterley (Inglaterra, Reino Unido)
Authors: Telfer, Gillian
Advisor: Rego, Francisco Castro
Keywords: spiders
multivariate analysis
community structure
Issue Date: 2008
Abstract: The present work proposed to evaluate the effects of land use and fragmentation on spider diversity and community structure. In Portugal, Oak, Pine, Eucalyptus and Shrubland were sampled to study the effects of habitat complexity on diversity, while abundance and richness were analyzed across a Eucalyptus-Grassland ecotone. In England, assemblage structure and diversity were assessed in different aged blocks of Sitka spruce and Oak woodland. Multivariate analyses were used to classify and ordinate data to assess the influence of measured environmental variables on spider distribution. Estimated values of richness calculated using non-parametric estimators confirmed that richness increased in areas with decreasing levels of disturbance. Using CCA, both crown cover and soil pH significantly influenced spider distribution in the forest areas. Across a Eucalyptus-Grassland ecotone, both abundance and richness were highest in Grassland, with spider abundance greatest 10m away from the boundary, and estimated richness highest at the Grassland-edge. A high degree of mixing was observed between the two habitats, with no apparent edge-associated species. Along a successional gradient in Sitka spruce, the number of species decreased with increasing plantation age, and was linked to the concomitant loss of vegetation complexity with increased canopy closure. Finally, 23 additions to the Portuguese checklist are provided.
Description: Doutoramento em Engenharia Florestal - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/605
Appears in Collections:BISA - Teses de Doutoramento / Doctoral Thesis

Files in This Item:

File Description SizeFormat
Resumo Portuguese.pdfResumo 6.97 kBAdobe PDFView/Open
Part A - Introduction.pdfIntroduction69.5 kBAdobe PDFView/Open
Part B - Chapters 1, 2 and 3, pages 1 to 62.pdfCap. 1, 2 e 31.35 MBAdobe PDFView/Open
Part C - Chapters 4, 5 and 6, pages 63 to 105.pdfCap. 4, 5 e 61.09 MBAdobe PDFView/Open
Part D - Chapter 7, pages 106 to 110.pdfCap. 7269.76 kBAdobe PDFView/Open
Part E - Bibliography, pages 111 to 131.pdfBibliografia126.37 kBAdobe PDFView/Open
PhD CV.pdfCurriculo119.72 kBAdobe PDFView/Open
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