Navegando por Assunto "Arecaceae"

Agora exibindo 1 - 2 de 2

Acesso aberto (Open Access)
Abundância e diversidade de palmeiras no Distrito Florestal Sustentável da rodovia BR-163, Pará, Brasil
(2011-09) SALM, Rodolfo Aureliano; JARDIM, Mário Augusto Gonçalves; ALBERNAZ, Ana Luisa Kerti Mangabeira
The abundance and diversity of palm species, as well as its relationship with forest structure were investigated in two study areas in the Sustainable Forest District of the BR-163 road. As such, forty parcels of 0.04 ha (20 × 20 m) were established in a pristine forest in the Amazonia National Park, and another forty parcels in a area submitted to timber logging in the Tapajos National Forest. In each parcel, all the trees with DBH ≥ 10 cm were measured and the adult palms were identified and counted. We verified that although the exploited forest of the Tapajos National Forest is structurally more open than the forest in the national park, it still has a quantity and diversity of palms inferior to the national park, probably due to the dispersal limitation of palms and the relatively recent logging activities. We concluded that exploitation potential of palms in native forests of the region is extremely limited by the natural scarcity of palms in native forests of economic potential, but could be amplified with the deliberate planting of useful species, with benefits for the natural dynamics of the forest.
Acesso aberto (Open Access)
Efeitos do manejo do açaí (Euterpe oleracea Mart.) sobre a avifauna em florestas de várzea estuarina na Amazônia
(Universidade Federal do Pará, 2017-05-30) NUNES, Raphael de Vasconcelos; LEES, Alexander Charles; http://lattes.cnpq.br/8887958109144699; LOPES, Maria Aparecida; http://lattes.cnpq.br/3377799793942627
Human actions and use of natural resources, by removing plant species, food resources or altering the environment’s structure, may have indirect effects on animal communities. The expansion of açaí (Euterpe oleracea) production has been altering floodplain forests through its management actions, resulting in environmental degradation and even substitution of forest for plantation areas, thus causing floristic empoverishment. In this paper we investigate the effects of this species management on the structure of bird community in an insular system of the Amazon River delta. Our hypothesis was that we would find less bird species diversity on managed areas (low and high intensity management) compared to non-managed forest fragments due to the environmental degradation caused by this practice. To assess the diversity and abundance of bird species we conducted point counts with auditory recordings and observations in three sites per treatment. We found a decrease tendency in bird species richness in intensively managed areas; but didn’t detect any changes on bird abundance and diversity in areas managed for açaí fruit production. We found alterations on bird community composition, being this more homogenous in managed areas. The effects of açaí management upon the fauna are still hard to detect but may arise in the future and our results point to the homogenization and species loss in areas subjected to intense management, causing birdlife empoverishment.