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Percorrer por autor "Marcos, N."

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  • Modelling managed maritime-pine stands undergrowth vegetation composition and diversity in relation to environmental, structural and management variables
    Publication . Capelo, Jorge; Mesquita, J.; Sequeira, Miguel; Aguiar, Carlos; Marcos, N.
    A case-study attempting to approach the patterns of species’ composition and diversity of the undergrowth vegetation of maritime-pine (Pinus pinaster Ait.) stands, in relation to environmental factors and forestry practices, is presented. Due to its large area in the rural landscape, forestry-intensive stands still have to be approached as ecologically meaningful. The vegetation patterns in these forests arise mostly from human disturbance related to management along with interactions with natural succession processes. Furthermore, tradeoffs of stand vegetation with the overall landscape-mosaic [neighbouring mass effects] adds further degrees-of-freedom to the problem. Describing and modelling such vegetation patterns asks for powerful multivariate statistical tools, since the main environment-vegetation interactions are expected to be complex and intricate.
    2003Documento de conferência Acesso aberto Ver mais
  • Scrophularia valdesii Ortega Olivencia & Devesa: confirmada a presença em Portugal de mais um endemismo lusitano-duriense
    Publication . Marcos, N.; Amado, Anabela; Aguiar, Carlos
    A Scrophularia valdesii é endemismo Ibérico, descrito por A. ORTEGA Olivencia & J.A. Devesa [Candollea 46: 111-118 (pág. 115)], cujo tipo nomencla-tural provém do termo de Aldeadávila, no canhão do Rio Douro Internacional. J.C. Costa et al. (Quercetea 0, 1998) consideram-na como um endemismo lusitano-duriense. O elenco dos endemis-mos, ou quasi endemismos, lusitano-duriense presentes em Portugal é agora constituído pelos seguintes táxones: Anarrhinum duriminium (Brot.) Pers., Antirrhinum lopesianum Rothm., Galium teres Merino (= Galium glaucum L. subsp. australe Franco), Scrophularia valdesii, Isatis platyloba Steud., Linaria coutinhoi Valdés, Trigonella polyceratia L. subsp. amandiana (Samp.) Amich & J. Sánchez, Holcus setiglumis Boiss. & Reut. subsp. duriensis P. Silva e Silene boryi Boiss. subsp. duriensis (Samp.) Coutinho.
    2003Artigo científico Acesso aberto Ver mais