Entity

Time filter

Source Type


Finger Z.,Federal University of Mato Grosso | Finger F.A.,Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renovaveis
Floresta | Year: 2015

Phytosociology of the arboreal communities remainders of sensu stricto cerrado in Central Brazil. This study has a objective to characterize the cerrado sensu stricto communities' arboreal stratum by evaluations of the richness, structures and diversity. Data of vegetation were obtained by the method of multiple plots, with size of 20 × 20 m (400 m2). In each one of the 82 patternless units were obtained the total height and the circumferences of all the arboreal plants with perimeter to 0.30 m from the level of the soil (PAB) larger or equal to 15.7 cm (DAB 5.0 cm). From the plot 60 (24.000 m2out of the area used as sample) the curve is stabilized with the occurrence of 106 species, distributed between 81 genera and 36 families, indicating that the sampling was enough to characterize and to evaluate the vegetations of cerrado sensu stricto studied. The species with larger VI were: Qualea parviflora, Curatella americana, Davilla elliptica, Qualea grandiflora, Pterodon emarginatus, Lafoensia pacari, Diptychandra aurantiaca, Myrcia albo-tomentosa, Caryocar brasiliense, Byrsonima pachyphylla, Byrsonima coccolobifolia, Hymenaea stigonocarpa, Callisthene fasciculata, Luehea paniculata, Magonia pubescens, Terminalia argentea, Erythroxylum deciduum, Couepia grandiflora and Pouteria ramiflora. The diversity from the arboreal vegetation found in the area being studied was of 4.033 nats/ind. considering the Shannon Index and of 0.975 considering the Simpson Index, representing a great floristic diversity. Source


Martins C.R.,Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renovaveis | du Vall Hay J.,University of Brasilia | Walter B.M.T.,Embrapa Recursos Geneticos e Biotecnologia | Proenca C.E.B.,University of Brasilia | Vivaldi L.J.,University of Brasilia
Revista Brasileira de Botanica | Year: 2011

In Brazil, several grass species are cited as invaders of protected areas. However, little is known about the impacts due to establishment and colonization of these species in protected areas in Brazil. Among the exotic grasses introduced into the Cerrado the African species Melinis minutiflora P. Beauv., molasses grass, deserves special mention. The objective of this study was to evaluate the impact of this grass on the biomass and species richness of the native community in an area of invaded Cerrado as well as to study the dynamics of the vegetation of the ground layer after different management treatments for control of molasses grass. The results showed that in the experimental area, where molasses grass composed 62% of the total biomass of the ground layer, the number of native species was high. In the areas where molasses grass had a high degree of coverage (> 98%) its biomass was approximately two times higher than values cited in other studies in the Cerrado. Between three and four years after using fire as a management tool for control of molasses grass its biomass returned to values similar to those observed prior to this treatment. Contrarily, with an integrated management treatment (May or September) a reduction of 99.9% in the presence of molasses grass was observed along with a recovery of native vegetation, making this a promising strategy for recuperation of areas in the Cerrado that were invaded by molasses grass. Source


Dias T.C.A.C.,Federal University of Amapa | Dias T.C.A.C.,Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renovaveis | Cunha A.C.,Federal University of Amapa | Silva J.M.C.,Federal University of Amapa | Silva J.M.C.,University of Miami
Biological Conservation | Year: 2016

Protected areas anchor the ecological infrastructure that societies need for long-term prosperity and provide benefits to local, national, and global stakeholders. However, these areas continue to go unfunded. In this paper, we have provided the first estimate of the return on investment for nine large protected areas that compose the core of the ecological infrastructure of the State of Amapá, which is located in a new forest frontier in Brazilian Amazonia. These nine protected areas will require US $147.2million over five years in order to be established and then US $32.7million in annual recurrent costs. If implemented, these nine protected areas have the potential to contribute at least US $362.4million per year in benefits (timber, non-timber forest products, nature-based tourism, fisheries, and carbon) to the local economy. The return on investment (ROI) of these protected areas will be 1.6% during the first five years and 10% thereafter; however, ROI could reach 45.8% or more if option and non-use values are also included as benefits. Although the costs of establishing the protected area system in Amapá are higher (US $3.2-3.5ha-1y-1) than the costs reported in other tropical forest regions (US $0.2-0.4ha-1y-1), the investments required are within the reach of both state and national governments. Our study shows that if fully implemented, protected areas can become engines for socio-economic upliftment, making the conservation-centered development model a feasible option for most of the world's new forest frontiers. © 2015 Elsevier Ltd. Source


Moura G.J.B.,Federal University of Alagoas | Moura G.J.B.,Federal University of Paraiba | Andrade E.V.E.,Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renovaveis | Freire E.M.X.,Federal University of Rio Grande do Norte
Check List | Year: 2010

The microhylid frog Stereocyclops incrassatus occurs in humid forests of the eastern coast of Brazil south of the São Francisco River, in the states of Minas Gerais, Espírito Santo and Bahia. The present work reports this species in three Atlantic Rainforest fragments located in states of Alagoas and Pernambuco, northeastern Brazil, thus expanding the known distribution of Stereocyclops incrassatus ca. 1000 km northwards. © 2010 Check List and Authors. Source


Leal Filho N.,National Institute of Amazonian Research | Sena J.D.S.,Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renovaveis | Santos G.R.D.,National Institute of Amazonian Research
Acta Amazonica | Year: 2013

The dispersion efficiency, longevity and the ability of seeds to remain latent waiting for suitable conditions for germination in the forest soil seed bank ensures the presence of pioneer tree species in disturbed areas. The seasonal and spatial variations in the density and floristic composition of the seed bank in tropical rainforests is a subject still little understood. This work verified the existence of spatio-temporal changes of the seed bank present in areas of humid tropical rain forest located near Manaus, Amazonas. In each of the six study areas, 40 circular samples of topsoil (10 cm in diameter and 2 cm deep) were randomly collected every two months, from August 2004 to June/2005. Inside a greenhouse, the collected soil samples were distributed in trays and the emergence of seeds present in the soil was accompanied during four months. There was a significant reduction (H: 14.09112, p <0.05) in the mean density of seeds presents in the soil in June (early dry season) compared to February (middle of the rainy season). There was also a significant difference (H: 188.7245, p <0.05) in the mean density of soil seeds present in the different samples areas. Similar to other tropical forest areas, the permanent seed bank in the forest was dominated by pioneer species, mainly from the family Melastomataceae, while typical tropical forest species were rare in the forest soil. Source

Discover hidden collaborations