Navegando por Assunto "Fenologia vegetal"

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Acesso aberto (Open Access)
Ecologia da polinização de taperebá (Spondias mombin L., Anacardiaceae) em área de floresta secundária no município de Santo Antônio do Tauá, Pará, Brasil
(Universidade Federal do Pará, 2009) RAMOS, Marina da Costa; VENTURIERI, Giorgio Cristino; http://lattes.cnpq.br/7180149611727426; ESPOSITO, Maria Cristina; http://lattes.cnpq.br/2112497575917273
The objective of this study was to characterize the pollination system of Spondias mombin L., through its phenology, floral biology, reproductive system and floral visitors. Spondias mombin blossomed during the dry station and produced mature fruits in the rainy station. It is an andromonoic species, that produces hermaphrodites and masculine flowers similars numbers and pollen viability. The analysis of pollen/ovule ratio showed that this species fits in the xenogamic reproductive system, and it needs the cross-pollination realized by insects. Spondias mombin was visited by a variety of small and generalistic insects as bees, flies, wasps and beetles. The bees Apis mellifera Linneu, 1758, Tetragona goettei (Friese, 1900) and Trigona hyalinata (Lepeletier, 1836) showed higher frequency and, their behavior to touch the reproductive parts of the flowers, suggest that they are the main pollinators of this plant species. In addition, the analysis of the collected pollen by the main pollinators demonstrated the fidelity of them to the taperebá and the great power of recruitment of this species.
Acesso aberto (Open Access)
Regeneração, manejo e exploração de açaizais nativos de várzea do estuário amazônico
(Universidade Federal do Pará, 1997-12-23) NOGUEIRA, Oscar Lameira; HOMMA, Alfredo Kingo Oyama; http://lattes.cnpq.br/1026511676619526
Açai palm (Euterpe oleracea Mart.) is an important component of the varzea forest ecosystem in the Brazilian Amazon. It is the main source of raw material for the palm heart industry, being responsible for more than 80% of the total produced in Brazil. The way in which this species has been exploited has caused its degradation in some areas, consequently reducing the production of fruits, an element of the diet for local inhabitants. The aim of this study was to analyze the regeneration process of natural açai palm areas modified by palm heart extraction in the lowlands of the Amazon River estuary. The research was carried out in the county of Igarapé-Miri, Pará, Brazil, where phenological, growth, social and economical factors were analyzed in order to identify rational methods of exploitation. Data were obtained on plant population, shoot emission, height, diameter, leaf number, dry matter production, productivity and profitability of managed and unmanaged açai palm areas at different periods after palm heart extraction (0, 12, 24 and 36 months). The results show that at 48 months after palm heart extraction the native açai-palm areas were rehabilitated and entered production again, presenting a population of 1.600 plants/ha, from which 30 % start to produce fruits and 50 % were capable of producing palm hearts. It was verified that fruit gathering is more profitable than palm hearts extraction and that management is a practice that increases productivity and profitability of native açai-palm in lowland flood areas.