Browsing by Author "Sequeira, Miguel"
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- Catálogo sintaxonómico e florístico das comunidades vegetais da Madeira e do Porto SantoPublication . Costa, José C.; Capelo, Jorge; Jardim, Roberto; Sequeira, Miguel; Espírito Santo, Dalila; Lousã, Mário; Fontinha, Suzana; Aguiar, Carlos; Rivas-Martinez, Salvador
- Checklist da Flora de Portugal Continental, Açores e MadeiraPublication . Sequeira, Miguel; Espírito Santo, Dalila; Aguiar, Carlos; Capelo, Jorge; Honrado, João JoséEm Novembro de 2007 realizou-se uma reunião entre a Direcção da ALFA e Instituto da Conservação da Natureza e da Biodiversidade (ICNB). Ficou então decidido que a ALFA tomaria a seu cargo a elaboração da Checklist da Flora de Portugal (Continental, Açores e Madeira). Após quase 3 anos de trabalho, a ALFA apresentou publicamente a Checklist durante os VIII Encontros Internacionais de Fitossociologia – ALFA, que decorreram em Lisboa entre 13 e 16 de Setembro de 2010. A ALFA disponibiliza agora a todos os interessados a Checklist da Flora de Portugal (Continental, Açores e Madeira). Através da página http://www3.uma.pt/alfa/checklist_flora_pt/output_db.php podem ainda ser enviados comentários, sugestões ou correcções. A Checklist da Flora de Portugal (Continental, Açores e Madeira) foi formalmente adoptada pelo ICNB e será parte integrante do inventário da biodiversidade prevendo-se a sua integração no futuro Sistema de Informação do Património Natural (SIPNAT,www.icn.pt/sipnat).
- Modelling managed maritime-pine stands undergrowth vegetation composition and diversity in relation to environmental, structural and management variablesPublication . 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.
- O novo catálogo da vegetação portuguesa (Continente, Açores e Madeira): descrição e importância para a conservação da flora e dos habitatsPublication . Costa, José C.; Neto, Carlos; Aguiar, Carlos; Capelo, Jorge; Espírito Santo, Dalila; Honrado, João José; Pinto-Gomes, Carlos; Monteiro-Henriques, T.; Sequeira, Miguel; Lousã, MárioIn this work we propose a syntaxonomic scheme, according to the Code of Phytosociological Nomenclature for the vegetation of Portugal: continental and the Azores and Madeira archipelagos. The scheme encompasses 827 associations (4 communities), 245 alliances, 116 orders, and 64 vegetation classes. The 58 suballiances, 2 suborders and 4 subclasses, are also mentioned, as auxiliary ranks. For the higher syntaxa down to suballiance level, succinct ecological, physiognomic and chorological diagnosis has been made, and the characteristic species are related. New syntaxa names and corrections are described and listed in Annex I. It is also presented a floristic catalogue sheet with the syntaxonomic optimal for each taxon (Annex III). This list contains 2930 taxa.
- Portulaca gr. oleracea L. no NE de PortugalPublication . Aguiar, Carlos; Sequeira, MiguelA taxonomia de Portulaca gr. oleracea é baseada nas dimensões e ornamentação das sementes (cf. A. DANIN, I. BAKER & H.J. BAKER, Israel J. Bot. 27: 177-211, 1978). Os distintos taxa desta grex – - tratados ao nível subespecífico na bibliografia taxonómica mais actual – são simpátricos embora se admita que a sua diferenciação tenha ocorrido em condições alopátricas (A. DANIN, In Castroviejo et al. Flora Iberica, vol. II: 465-469, 1990). Na recente revisão do género Portulaca para a Flora Iberica (A. DANIN, 1990, op. cit.) está citada uma única subspécie de P. oleracea em Trás-os- -Montes: P. oleracea L. subsp. granulatostellulata (Poellnitz) Danin
- The vegetation of Madeira: II - woody caulirosetted communities of evergreen forest clearings: Euphorbion melliferae all. nova.Publication . Capelo, Jorge; Costa, José C.; Jardim, Roberto; Sequeira, Miguel; Aguiar, Carlos; Lousã, MárioThe endemic caulirosetted microphanerophytes [with a rosette of leaves on top of a long woody few-branched naked stem] – e.g. Euphorbia mellifera, Isoplexis sceptrum, Melanoselinum decipens, Musschia wollastonii and Sonchus fruticosus – are among the most striking plants of Madeira Island. They are often found in the "levadas" artificial system of channels that runs through the Ocotea foetens forest [Clethro arboreae-Ocoteetum foetentis]. These plants organize themselves in a particular phytocoenosis – Isoplexido sceptri-Euphorbietum melliferae ass. nova. – that reflects a worldwide recurrent phenomenon in forest ecosystems: the presence of plants adapted to cuts in the continuous crown layer of dense forest, such as dry ravines, forest clearings produced by tempests, landslides and other natural disturbances. "Levadas" are artificial simulations of these natural habitats.
- The vegetation of Madeira: III - Diplazio caudati-Perseetum indici ass. nova and Rhamno glandulosi-Sambucetum lanceolati ass. nova: two new hygrophillic forest associations from Madeira IslandPublication . Capelo, Jorge; Costa, José C.; Jardim, Roberto; Sequeira, Miguel; Aguiar, Carlos; Lousã, MárioDescriptions of forest vegetation of Madeira Island included, so far, two types of climatophylous broadleaf forest vegetation – Clethro arboreae-Ocoteetum foetentis and Semele androgynae- Apollonietum barbujanae – with an arboreal stratum respectively dominated by two Lauraceae trees: Ocotea foetens [til] and Apollonias barbujana [barbusano]. Recently, we discovered that the other Lauraceae Madeira's tree – Persea indica [vinhático] – is the dominant tree in a third type of broadleaf forest - Diplazio caudati-Perseetum indici ass. nova.
- The vegetation of Madeira: IV - Coastal Vegetation of Porto Santo Island (Archipelag of Madeira)Publication . Capelo, Jorge; Costa, José C.; Jardim, Roberto; Sequeira, Miguel; Aguiar, Carlos; Espírito Santo, Dalila; Lousã, MárioThe littoral geomorphology of the Porto Santo Island is of paramount importance in the coastal phytocoenosis assemblage: the southern part of the island has an 8 km long sand beach with littoral sandstone platforms in its eastern extreme; sandstone or volcanic (mostly trachits) sea cliffs predominate in the rest of the island; in the northern part of the island, near the airport, there is an elevated dune (more than 150 m above sea level), related to an ancient island tilt. In the Porto Santo' s beach and cliff ecosystems, we found four new associations. All of them are finicolous associations in the context of their alliances, with low floristic diversity and presided by small area endemics.
- The vegetation of Madeira: V - Lino stricti-Stipetum capensis, ass. nova and Vicio costei-Echietum plantagini, ass. nova, two new semi-nitrophylous associations from Porto-Santo Island (Archipelag of Madeira)Publication . Jardim, Roberto; Sequeira, Miguel; Capelo, Jorge; Aguiar, Carlos; Costa, José C.; Espírito Santo, Dalila; Lousã, MárioPorto Santo is a deeply eroded oceanic island. The human uses of the territory led to a massive destruction of its primitive vegetation cover and its substitution by new types of vegetation constituted by plants adapted to the novel perturbation regimes introduced by human settlers. A vegetation cover once dominated by trees or shrubs that evolved isolated from herbivory during millions of years, was replaced since the XV century by herbaceous anthropogenic vegetation, dominated by neophytes, adapted to perturbation events imposed by mammal herbivores (goats and rabbits) and by dry-farming agriculture (mostly barley). Agriculture and grazing together with low climatic precipitation levels promoted subnitrophylous types of herbaceous vegetation. So, today's Porto Santo vegetation is largely dominated by two, yet undescribed, herbaceous subnitrophylous phytocoenosis: Lino stricti-Stipetum capensis and Vicio costei-Echietum plantagini.
- Vascular plant communities in Portugal (continental, the Azores and Madeira)Publication . Costa, José C.; Neto, Carlos; Aguiar, Carlos; Capelo, Jorge; Espírito Santo, Dalila; Honrado, João José; Gomes, Carlos; Monteiro-Henriques, T.; Sequeira, Miguel; Lousã, MárioIn this paper we propose a syntaxonomic scheme, according to the Code of Phytosociological Nomenclature for the vegetation of Portugal: continental and the Azores and Madeira archipelagos. The scheme encompasses 827 associations (4 communities), 245 alliances, 116 orders, and 64 vegetation classes. The 58 suballiances, 2 suborders and 4 subclasses, are also mentioned, as auxiliary ranks. For the higher syntaxa down to suballiance level, succinct ecological, physiognomic and chorological diagnosis has been made, and the characteristic species are related. New syntaxa names and corrections are described and listed in Annex I. It is also presented a floristic catalogue sheet with the syntaxonomic optimal for each taxon (Annex III). This list contains 2930 taxa.