Navegando por Assunto "Restingas"

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Acesso aberto (Open Access)
Anatomia foliar de cinco espécies de Polygala de restinga e cerrado
(2012-06) DIAS, Ana Cristina Andrade de Aguiar; YAMAMOTO, Kikyo; CASTRO, Marília de Moraes
The ecological plasticity observed in plants that inhabit different vegetation formations is often accompanied by morphological variations, the leaf being the vegetative organ with the greatest structural variation. In view of this concept, the leaf anatomy of five species of Polygala L. occurring in restinga (sandy coastal plain) and cerrado (savanna) areas in the state of São Paulo were analyzed in order to inventory their principal characters and describe their leaf structure, to thus compare them and assess the possibility of verifying structural patterns common to the ecological conditions of both vegetation formations. The species studied were: P. cyparissias A.St.-Hil. & Moq., P. laureola A.St.-Hil. & Moq., P. paniculata L. found in restinga, and P. angulata DC. and P. violacea Aubl. emend. Marques occurring in campo cerrado and cerradão margin areas, respectively. The middle region of the leaf blade and petiole proximal region of each leaf were processed following the usual techniques for scanning electron and light microscopy. The results show two structural patterns common to the species from the restinga and cerrado area formations: mesomorphic characteristics are observed in P. laureola, P. paniculata, and P. violacea, and xeromorphic in P. cyparissias and P. angulata.
Acesso aberto (Open Access)
Manejo de agrobiodiversidad en geoformas de restingas de várzea peruana, Iquitos/Perú
(Universidade Federal do Pará, 2005-07-14) ROMERO PINEDO, Roberto Carlos; MCGRATH, David Gibbs; http://lattes.cnpq.br/4373475491613670
The study has as purpose to evaluate and analyze the management of the agrobiodiversity in sandbank geoforms from the adaptability of the practiced agrobiodiversity and its function in the economic strategies of the riverine producing families. The relative stability of geoforms of sandbanks in function to the erosion and flood and its great natural agro-biologic potential, explains its occupation and intensification of Amazon’s soil usage larger before its discovery and colonization by the Europeans (Spanish and Portuguese). The adaptability of the riverine agrodiversity, as strategy to produce, manage and preserve the diversity of agricultural, agroflorestal and other resources of the Amazon agrobiodiversity, in different units of production or agroecosystems (vegetable, garden, small holding, woods) of familiar ownership, has contributed to reach the alimentary self-sufficiency during the year and mainly to face or to reduce risk caused by high flood and by the market (instability of prices). The field work was carried out in the Peruvian Amazonian cultivated plains, specifically in the Muyuy Sector in the outheast of Iquitos city.
Acesso aberto (Open Access)
Plantas nativas úteis na Vila dos Pescadores da Reserva Extrativista Marinha Caeté-Taperaçu, Pará, Brasil
(2010-12) CARNEIRO, Diogo Borges; BARBOZA, Myrian Sá Leitão; MENEZES, Moirah Paula Machado de
This study identifies the native plant species used by the inhabitants of Vila dos Pescadores, Caeté-Taperaçu Marine Extractive Reserve, Bragança, Pará, Brazil. By means of semi-structured interviews with 30 inhabitants, a socio-economic profile of the people interviewed was done; useful plant species and their respective usage were recorded. A total of 23 species were cited. Of these, 20 species are native to mangrove or sand dune (restinga) ecosystems. The remaining 3 species are considered "native" by village inhabitants, although they are in fact introduced exotic species. Most of the restinga species are used for food, while most mangrove species are employed in a broad range of usage types, mainly associated with "construction" and "technical applications" categories. The fishing profession was evident in plant species usage, especially for the mangrove species. The Shannon diversity index was high (H'=2.3) due to the large number of reported uses of mangrove species. The results indicate that, due to the great utility of native plant species, the management, use and preservation policies of Marine Extractive Reserves should pay more attention to the exploitation of plant resources, especially those from mangrove forests.
Acesso aberto (Open Access)
The coastal restinga vegetation of Pará, Brazilian Amazon: a synthesis
(2010-12) SILVA, Rachel Macedo da; MEHLIG, Ulf; SANTOS, João Ubiratan Moreira dos; MENEZES, Moirah Paula Machado de
The present article reviews studies (some unpublished) of the vegetation of coastal sandy soils (restinga) along the coast of Pará State, northern Brazil. A total of 411 higher plant species are reported; Fabaceae, Poaceae, Cyperaceae, Rubiaceae and Myrtaceae are the most species-rich families. Nearly half of the restinga species (48%) are terrestrial herbs; palms, trees and shrubs account for 39% of the species, the remainder being lianas and epiphytes. Species are frequently wide-spread and occur in coastal areas of Southeastern Brazil as well as at inland sites in the Amazon region. Only two species appear to be exclusively coastal; whereas other species appear to exhibit a preference for sandy soils. Plant assemblages are commonly classified by means of "formations" associated with certain habitats but current data do not allow the description of well-defined plant associations. The species composition at different sites along the Pará coast does not show any clear regional grouping pattern. Seasonal changes in the composition of restinga vegetation are most probably linked to variation in ground water level. Restinga forest is mostly low and open; among the dominant tree species are Humiria balsamifera Aubl., Pouteria ramiflora (Mart.) Radlk., Anacardium occidentale L., Byrsonima crassifolia (L.) Kunth, and Tapirira guianensis Aubl.