Percorrer por autor "Jardim, Roberto"
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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
- 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.