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Habitat use by Astyanax taeniatus (Jenyns, 1842) (Characiformes: Characidae) in a coastal stream from Southeast Brazil Neotropical Ichthyology
Manna,Luisa Resende; Rezende,Carla Ferreira; Mazzoni,Rosana.
The habitat use of a stream-dwelling Astyanax taeniatus from the State of Rio de Janeiro was investigated. We performed 12 h of underwater observation in a 200 m long stretch in the upper Roncador stream and quantified the following microhabitat descriptors: (i) water velocity, (ii) distance from the stream bank, (iii) substratum, and (iv) water column depth. Microhabitat selectivity was analyzed by comparing the microhabitat used by fish and the microhabitat available in the study site as well as by applying the Ivlev Electivity Index to the microhabitat use data. Differences in the use and availability of the various microhabitats revealed non-stochastic patterns of spatial occupation by A. taeniatus, which was selective for two of the four analyzed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Snorkeling; Micro-habitat; Rain Forest; Non-stochastic use; Environmental resources.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000100187
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Criteria to be considered to achieve a sustainable second cycle in Amazon Forest PFB - Pesquisa Florestal Brasileira
Braz, Evaldo Muñoz; Mattos, Patricia Povoa; Thaines, Fabio; de Madron, Luc Durrieu; Garrastazu, Marilice Cordeiro; Canetti, Aline; d’Oliveira, Marcus Vinício Neves.
Remnant forest structure and increment by diameter class play a decisive role in the recovery volume for the next cutting cycle. Tree species in the Amazon Forest do not present a defined pattern of diameter structure, which is discussed here using Cedrela odorata L. as a case study The aim of this study was to identify, by simulation, recovery from logging in a real situation at three timber production sites, and the alternatives that are available to ensure commercial timber volume to a second cut cycle in the Brazilian Amazon. The study is concerned regarding the diametric classes of productive trees to the next cycle, the comparison demonstrates that one of the strategies recovers stock volume more quickly than expected in the cut cycle defined by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Manejo florestal; Dendrometria Cedrela odorata; Sustainable forest management; Cut rate; Rain Forest; Volume recover; Diametric structure Cedrela odorata; Manejo florestal sustentável Taxa de corte Floresta tropical; Recuperação em volume; Estrutura diamétrica.
Ano: 2015 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/941
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Using termite nests as a source of organic matter in agrosilvicultural production systems in Amazonia Scientia Agricola
Batalha,L. S.; Silva Filho,D. F. da; Martius,C..
The growth of two annual crops, okra (Abelmoschus escutentus) and egg-plant (Solatium melongena) and one perennial crop, andiroba (Carapa guianensis, a native forest tree of Amazonia) under different treatments with organic manure derived from termite nest material of wood-feeding Nasutitermes species was tested (randomized block design). The use of 25-100 g of nest material gave no significant increase in okra productivity, and 25-200 g gave no significant response in andiroba. The combined use of NPK with 200 g of nest material gave a significant higher production in egg-plant (total number and total fresh weight of fruits) when compared to the control (without fertilizer) and to the treatment with NPK only.The results suggest the possibility to use...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazonia; Rain Forest; Low Soil Fertility; Crop Production; Termite Nest Material; Organic Matter; Okra; Egg-Plant; Andiroba; Amazônia; Floresta tropical úmida; Baixa fertilidade de solo; Produção agrossilvicultural; Material de cupinzeiro; Matéria orgânica; Quiabo; Berinjela; Andiroba.
Ano: 1995 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161995000200019
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Carbon sequestration in the rain forest: alternatives using environmentally friendly biotechnology Biota Neotropica
Buckeridge,Marcos S.; Aidar,Marcos P.M..
As carbon dioxide increases on Earth atmosphere, the rise in average temperatures may provoke changes in the environment that could damage civilisation as we know it. As a result, the need to sequester carbon becomes urgent, and one of the options we have is to use the potential of the forests to do it by enhancing assimilation of CO2 through photosynthesis. However, if we consider the use of plants to increase carbon sequestration, a problem that looms is that species often acclimate and actually reduce CO2 assimilation through feedback mechanisms of the sugars that are the product. In the present article, we propose that some biochemical pathways, such as those in control of photosynthesis, carbohydrate metabolism and assimilation, and cellulose and...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Global change; Carbon Sequestration; Photosynthesis; Rain Forest; Sugar Sensing; Cellulose synthesis; Gene therapy.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032002000100002
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