Consulta: subjectFacets:"Tropical forest"
Registros recuperados: 55
Data/hora: 09/06/2024 07:23:32

Priority Areas for Establishing National Forests in the Brazilian Amazon
Provedor de dados: 7
Brazil will benefit if it gains control of its vast Amazonian timber resources. Without immediate planning, the fate of much of the Amazon will be decided by predatory and largely unregulated timber interests. Logging in the Amazon is a transient process of natural resource mining. Older logging frontiers are being exhausted of timber resources and will face severe wood shortages within 5 yr. The Brazilian government can avoid the continued repetition of this process in frontier areas by establishing a network of National Forests (Florestas Nacionais or Flonas) to stabilize the timber industry and simultaneously protect large tracts of forest. Flonas currently comprise less than 2% of the Brazilian Amazon (83,000 km2). If all these forests were used for...
Tipo: Peer-Reviewed Reports
Palavras-chave: Amazon; Brazil; GIS model; Conservation; Logging; National forest; Production forest; Sustainable management; Tropical forest.
Ano: 2002

Use of a Bayesian Belief Network to Predict the Impacts of Commercializing Non-timber Forest Products on Livelihoods
Provedor de dados: 7
Autores: Newton, Adrian C; Bournemouth University; anewton@bournemouth.ac.uk; Marshall, Elaine; UNEP-World Conservation Monitoring Centre; elaine.marshall@unep-wcmc.org; Schreckenberg, Kathrin; Overseas Development Institute; KSchreckenberg@odi.org.uk; Golicher, Duncan; El Colegio de la Frontera Sur; dgoliche@sclc.ecosur.mx; te Velde, Dirk W; Overseas Development Institute; dwtevelde@odi.org.uk; Edouard, Fabrice; Methodus Consultora;; Arancibia, Erik; ;.
Commercialization of non-timber forest products (NTFPs) has been widely promoted as a means of sustainably developing tropical forest resources, in a way that promotes forest conservation while supporting rural livelihoods. However, in practice, NTFP commercialization has often failed to deliver the expected benefits. Progress in analyzing the causes of such failure has been hindered by the lack of a suitable framework for the analysis of NTFP case studies, and by the lack of predictive theory. We address these needs by developing a probabilistic model based on a livelihood framework, enabling the impact of NTFP commercialization on livelihoods to be predicted. The framework considers five types of capital asset needed to support livelihoods: natural,...
Tipo: Peer-Reviewed Reports
Palavras-chave: Conservation; NTFP; Sustainable development; Tropical forest.
Ano: 2006

The Relation Between Income and Hunting in Tropical Forests: an Economic Experiment in the Field
Provedor de dados: 7
Autores: Cardenas, Juan Camilo; Universidad de los Andes; jccarden@uniandes.edu.co.
Hunting in tropical forests is both a major cause of biodiversity loss and an important food source for millions of people. A question with important policy implications is how changes in income level affect how much people hunt. This study, which was carried out in an indigenous community in the Amazon, explored the relation between income and consumption of wild meat using an economic experiment in the form of a lottery, and involved the local people, not only as experimental subjects, but also in the interpretation of results. The results suggested that an increase in steady employment, rather than in income alone, may lead to the substitution of non-hunted foods for wild meat. The kind of social learning that participation in this type of economic...
Tipo: Peer-Reviewed Reports
Palavras-chave: Amazon; Economic development; Experimental economics; Hunting; Income; Lottery; Participatory research; Tropical forest; Wild meat.
Ano: 2006

Historical, Demographic, and Economic Correlates of Land-Use Change in the Republic of Panama
Provedor de dados: 7
Autores: Wright, Stuart Joseph; Smithsonian Tropical Research Institute; wrightj@si.edu; Samaniego, Mirna Julieta; Smithsonian Tropical Research Institute; samaniem@si.edu.
Tipo: Peer-Reviewed Reports
Palavras-chave: Agricultural income; Agriculture; Cattle; Deforestation; Forest transition; Land cover; Pasture; Plantation; Reforestation; Tropical forest.
Ano: 2008

DNA barcoding in Atlantic Forest plants: what is the best marker for Sapotaceae species identification?
Provedor de dados: 74
Autores: Vivas,Caio Vinicius; Moraes,Ramiris César Souza; Alves-Araújo,Anderson; Alves,Marccus; Mariano-Neto,Eduardo; van den Berg,Cássio; Gaiott,Fernanda Amato.
The Atlantic Forest is a phytogeographic domain with a high rate of endemism and large species diversity. The Sapotaceae is a botanical family for which species identification in the Atlantic Forest is difficult. An approach that facilitates species identification in the Sapotaceae is urgently needed because this family includes threatened species and valuable timber species. In this context, DNA barcoding could provide an important tool for identifying species in the Atlantic Forest. In this work, we evaluated four plant barcode markers (matK, rbcL, trnH-psbA and the nuclear ribosomal internal transcribed spacer region -ITS) in 80 samples from 26 species of Sapotaceae that occur in the Atlantic Forest. ITS yielded the highest average interspecific...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Internal transcribed spacer; Taxonomy; Tree species; Tropical forest.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000500009

Metodologia utilizada na construção de tabelas de volume.
Provedor de dados: 14
Autores: SILVA, J. N. M.
bitstream/item/58734/1/CPATU-Doc50.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Análise de regressão; Condicionante de regressão; Teste de paralelismo; Teste de coincidência; Análise de resíduo; Tropical forest; Tree; Selection; Regresion analysis; Assumption for regression; Paralelism test; Coincidence test; Residual analysis.; Árvore; Floresta Tropical; Seleção.
Ano: 1988
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/381195

Regulation of nitrogen fixation from free-living organisms in soil and leaf litter of two tropical forests of the Guiana shield
Provedor de dados: 5
Autores: Van Langenhove, Leandro; Depaepe, Thomas; Vicca, Sara; Van Den Berge, Joke; Stahl, Clement; Courtois, Elodie; Weedon, James; Urbina, Ifigenia; Grau, Oriol; Asensio, Dolores; Peñuelas, Josep; Boeckx, Pascal; Richter, Andreas; Van Der Straeten, Dominique; Janssens, Ivan A.
Background and aims Biological fixation of atmospheric nitrogen (N2) is the main pathway for introducing N into unmanaged ecosystems. While recent estimates suggest that free-living N fixation (FLNF) accounts for the majority of N fixed in mature tropical forests, the controls governing this process are not completely understood. The aim of this study was to quantify FLNF rates and determine its drivers in two tropical pristine forests of French Guiana. Methods We used the acetylene reduction assay to measure FLNF rates at two sites, in two seasons and along three topographical positions, and used regression analyses to identify which edaphic explanatory variables, including carbon (C), nitrogen (N), phosphorus (P) and molybdenum (Mo) content, pH, water...
Tipo: Text
Palavras-chave: Free-living nitrogen fixation; Tropical forest; French Guiana; Nutrients; Phosphorus; Molybdenum.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00487/59901/63083.pdf

Rapid root assimilation of added phosphorus in a lowland tropical rainforest of French Guiana
Provedor de dados: 5
Autores: Van Langenhove, Leandro; Janssens, Ivan A.; Verryckt, Lore; Brechet, Laetitia; Hartley, Iain P.; Stahl, Clement; Courtois, Elodie; Urbina, Ifigenia; Grau, Oriol; Sardans, Jordi; Peguero, Guille; Gargallo-garriga, Albert; Peñuelas, Josep; Vicca, Sara.
Theory states that tree growth in lowland tropical forests on old, weathered soils is limited by low phosphorous (P) availability. However, evidence for P limitation from nutrient manipulation experiments remains unclear, which raises the question whether trees are taking up added P. In French Guianese lowland rainforest, we measured changes in nitrogen (N) and P availability before and up to two months after N and P addition. We measured in soils with intact root systems and soils excluding roots and mycorrhizal fungi with root exclusion cylinders. When the root system was excluded, P addition increased P availability to a much greater extent and for a longer time than where the roots remained undisturbed. N dynamics were unaffected by root...
Tipo: Text
Palavras-chave: Tropical forest; Phosphorus; Nitrogen; Fertilization; Root system; Plant root simulator probes.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00589/70161/68163.pdf

Monitoring canopy bird activity in disturbed landscapes with automatic recorders: A case study in the tropics
Provedor de dados: 5
Autores: Ducrettet, Manon; Forget, Pierre-michel; Ulloa, Juan Sebastian; Yguel, Benjamin; Gaucher, Philippe; Prince, Karine; Haupert, Sylvain; Sueur, Jerome.
Tropical forests are facing threats that may affect the dynamics of seed dispersers which participate in the forest regeneration. To implement appropriate conservation programs, it appears necessary to monitor seed dispersers and to estimate their response to local changes. Here, we used non-invasive ecoacoustic methods to monitor the activity of a canopy bird, the White-throated toucan, Ramphastos tucanus, a major seed disperser and flagship species of the Amazonian forest. We deployed nine acoustic recorders over 29 days along a road that connects French Guiana to Brazil. We used template matching to automatically detect the vocalizations of R. tucanus. This method, which can easily be repeated with limited human expertise, detected 1748 recordings with...
Tipo: Text
Palavras-chave: Biodiversity monitoring; Tropical forest; Ecoacoustics; Human activity.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00657/76860/78170.pdf

Disentangling Drought and Nutrient Effects on Soil Carbon Dioxide and Methane Fluxes in a Tropical Forest
Provedor de dados: 5
Autores: Bréchet, Laëtitia; Courtois, Elodie A.; Saint-germain, Thomas; Janssens, Ivan A.; Asensio, Dolores; Ramirez-rojas, Irene; Soong, Jennifer L.; Van Langenhove, Leandro; Verbruggen, Erik; Stahl, Clément.
Tropical soils are a major contributor to the balance of greenhouse gas (GHG) fluxes in the atmosphere. Models of tropical GHG fluxes predict that both the frequency of drought events and changes in atmospheric deposition of nitrogen (N) will significantly affect dynamics of soil carbon dioxide (CO2) and methane (CH4) production and consumption. In this study, we examined the combined effect of a reduction in precipitation and an increase in nutrient availability on soil CO2 and CH4 fluxes in a primary French Guiana tropical forest. Drought conditions were simulated by intercepting precipitation falling through the forest canopy with tarpaulin roofs. Nutrient availability was manipulated through application of granular N and/or phosphorus (P) fertilizer to...
Tipo: Text
Palavras-chave: Carbon dioxide; Drought; Fertilization; Methane; Nitrogen; Phosphorus; Soil GHG fluxes; Tropical forest.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00595/70694/68903.pdf

A new species of Alphonsea (Annonaceae) from Peninsular Malaysia
Provedor de dados: 16
Autores: Turner, I.M.; Utteridge, T.M.A.
Alphonsea rugosa sp. nov. is described from eastern Peninsular Malaysia. It is similar to Alphonsea elliptica but has fruits that are dry wrinkled and glabrous rather than smooth and tomentose. A conservation assessment of Vulnerable based on collections from four locations is made.
Tipo: Article / Letter to the editor
Palavras-chave: IUCN; Malay Peninsula; Malesia; South-East Asia; Taxonomy; Tropical forest.
Ano: 2015
URL: http://www.repository.naturalis.nl/record/578384

Dung beetle communities: a neotropical-north temperate comparison
Provedor de dados: 82
Autores: Radtke,Meghan G; Fonseca,Cláudio R V da; Williamson,G Bruce.
Dung beetle communities have been compared across north temperate latitudes. Tropical dung beetle communities appear to be more diverse based on studies using different methodologies. Here, we present results from a standardized sampling protocol used to compare dung beetle communities across five neotropical forests in Brazil and Ecuador and two warm, north temperate forests in Mississippi and Louisiana. Species richness in the tropical forests was three to seven times higher than the temperate forests, as would be expected by studies of other taxa across tropical and temperate latitudes. Average body size in the temperate forests was larger than the tropical forests, as predicted by Bergmann's rule. Dung beetle abundance and volume per trap-day were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abundance; Diversity; Scarabaeidae; Temperate forest; Tropical forest.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000100004

Mesofauna do solo em diferentes sistemas de uso da terra no Alto Rio Solimões, AM
Provedor de dados: 82
Autores: Morais,José W de; Oliveira,Viviane dos S; Dambros,Cristian de S; Tapia-Coral,Sandra C; Acioli,Agno N S.
The mesofauna has an important function in the soil and it is represented mainly by Acari Oribatida and Collembola. We report the first data on the density and diversity of the soil mesofauna in Benjamin Constant, Amazonas State, Brazil. The following systems were evaluated: primary forest, secondary forest, agroforestry system, cultivated areas and pastures. A total of 101 samples were collected 100 m apart from each other and specimens were collected by using Berlese-Tullgren method. The highest density was registered in secondary forest (29,776 specimens.m-2). Acari Oribatida was the dominant group (7.072 specimens.m-2) in the pasture, suggesting that mites show higher capacity of adaptation to disturbed environments and/or due to the presence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil invertebrate; Biodiversity; Soil fauna; Tropical forest.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000200001

Equations for estimating timber volume in the region of the River Basin of Ituxi, Lábrea, Amazon, Brazil
Provedor de dados: 190
Autores: Thaines, Fabio; Braz, Evaldo Muñoz; Mattos, Patricia Povoa de; Thaines, Andreia Aparecida Ribeiro.
To quantify the stock of commercial timber in forests demands efficient methods, making possible to estimate efficiently and accurately the present and future timber volume. The aim of this work was to  adjust the mathematical models used to estimate timber volume, allowing the determination of the timber potential of a region with greater accuracy and lower cost. The study was conducted at Lábrea, State of  Amazonas, Brazil in an area of 6,000 ha, inserted in the Project Forest Management Seringal Iracema II. The forest is predominantly dense with emergent trees, also with the occurrence of open forest with bamboo and palms. For the process of adjusting the models to estimate the volume of commercial timber, 141 trees of commercial species were cubed by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Volume equations; Tropical forest; Forest management. Equações de volume; Manejo florestal; Floresta tropical.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/155

SPECIES DIVERSITY AND COMMUNITY STRUCTURE OF FRUIT-FEEDING BUTTERFLIES (LEPIDOPTERA: NYMPHALIDAE) IN AN EASTERN AMAZONIAN FOREST
Provedor de dados: 84
Autores: MARTINS,LUCAS PEREIRA; ARAUJO JUNIOR,ELIAS DA COSTA; MARTINS,ANANDA REGINA PEREIRA; DUARTE,MARCELO; AZEVEDO,GISELE GARCIA.
ABSTRACT Deforestation has negative impacts on diversity and community patterns of several taxa. In the eastern Amazon, where much deforestation is predicted for the coming years, forests patches may be essential to maintain the local biodiversity. Despite increasing concerns about the conservation of threatened areas, few studies have been performed to analyze the communities of diversified groups, such as insects, in the eastern Amazon. Here, we investigated species diversity and community structure of fruit-feeding butterflies, a well-known bioindicator group, in a threatened remnant of an eastern Amazonian forest located on Maranhão Island, northeastern Brazil. Fruit-feeding butterflies were sampled monthly for one year. Diversity and evenness indices,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Butterfly assemblage; Frugivorous butterflies; Neotropical region; Tropical forest.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492017003800481

Earthworms from Mato Grosso, Brazil, and new records of species from the state
Provedor de dados: 86
Autores: Bartz,Marie Luise Carolina; Pasini,Amarildo; Brown,George Gardner.
The objective of this work was to undertake a qualitative assessment of earthworm diversity in areas under human influence, in a region of Cerrado-Pantanal-Amazon rainforest transition, in the state of Mato Grosso, Brazil. The earthworms were collected in the municipalities of Barra do Bugres and Arenápolis, and were studied together with species previously identified from other municipalities. Seventeen municipalities, at 29 sampling points of Mato Grosso State, have been sampled. Seven species of earthworms were collected and identified in Barra do Bugres: Goiascolex vanzolinii, Pontoscolex (Pontoscolex) corethrurus, Opisthodrillus borellii borellii, Opisthodrillus sp., Dichogaster (Diplothecodrilus) gracilis, Dichogaster sp. and a species of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Tropical forest; Oligochaeta.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800020

Ant species distribution along a topographic gradient in a "terra-firme" forest reserve in Central Amazonia
Provedor de dados: 86
Autores: Oliveira,Pollyana Yvonica de; Souza,Jorge Luiz Pereira de; Baccaro,Fabricio Beggiato; Franklin,Elizabeth.
In Amazonia, topographical variations in soil and forest structure within "terra-firme" ecosystems are important factors correlated with terrestrial invertebrates' distribution. The objective of this work was to assess the effects of soil clay content and slope on ant species distribution over a 25 km² grid covering the natural topographic continuum. Using three complementary sampling methods (sardine baits, pitfall traps and litter samples extracted in Winkler sacks), 300 subsamples of each method were taken in 30 plots distributed over a wet tropical forest in the Ducke Reserve (Manaus, AM, Brazil). An amount of 26,814 individuals from 11 subfamilies, 54 genera, 85 species and 152 morphospecies was recorded (Pheidole represented 37% of all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta diversity; Environmental gradient; Formicidae; Soil texture; Tropical forest.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800008

Efficiency in inventories of ants in a forest reservein Central Amazonia
Provedor de dados: 86
Autores: Souza,Jorge Luiz Pereira de; Moura,Carlos Alberto Ribeiro de; Franklin,Elizabeth.
The objective of this work was to evaluate an inventory method efficiency for ants. We used subsamples collected in 24 transects of 100 m, distributed in 6 plots of 600 ha each in primary forest, as part of a long-term project. Ten litter subsamples were extracted per transect using Winkler extractors. Ants were identified to genus level, and Crematogaster, Gnamptogenys and Pachycondyla genera to species/morphospecies level. To evaluate the consequences of reduced sampling on the retention of ecological information, we estimated the lowest number of subsamples needed to detect the effects of environmental variables. Multidimensional scaling (MDS) was used to generate dissimilarity matrices, and Mantel correlations between each reduced-sampling effort and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Formicidae; Environmental impact assessment; Soil biodiversity; Winkler extractors; Tropical forest; Sampling protocols.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800021

Land Conversion, Interspecific Competition, and Bioinvasion in a Tropical Ecosystem
Provedor de dados: 31
Autores: Barbier,   Edward B.
This paper investigates the relationships among land-use change, biological invasion, and interspecific competition in a tropical ecosystem by linking a behavioral model of land conversion by agriculture and an ecological model of interspecific competition between a native species and an exotic invader.  The model is used to examine how relative farm prices and access to forest areas influence land clearing and thus the ability of the invasive species to eliminate the native species.  Simulations show that only a 20% rise in relative prices and a 2.75% increase in forest access are necessary for this outcome to occur.
Tipo: Journal Article
Palavras-chave: Biological invasion; Interspecific competition; Land clearing; Tropical ecosystem; Tropical forest; O13; Q20; Q24.
Ano: 2007
URL: http://purl.umn.edu/37275

Horizontal and vertical tree community structure in a lowland atlantic rain forest, southeastern Brazil
Provedor de dados: 88
Autores: Guilherme,Frederico Augusto G.; Morellato,L. Patrícia C.; Assis,Marco A.
The horizontal and vertical tree community structure in a lowland Atlantic Rain Forest was investigated through a phytosociological survey in two 0.99 ha plots in the Intervales State Park, São Paulo State. All trees &gt; 5 cm diameter at breast height were recorded. 3,078 individuals belonging to 172 species were identified and recorded. The Shannon diversity index was H' = 3.85 nat.ind.-1. The Myrtaceae family showed the greatest floristic richness (38 species) and the highest density (745 individuals) in the stand. Euterpe edulis Mart. had the highest importance value (33.98%) accounting for 21.8% of all individuals recorded. The quantitative similarity index was higher than the qualitative index, showing little structural variation between plots....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Multivariate analysis; Phytosociology; Tree stratification; Tropical forest.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000400012

Flowering and fruiting of Aulonemia aristulata: a gynomonoecious woody bamboo species from Atlantic Forest in Brazil
Provedor de dados: 88
Autores: Grombone-Guaratini,M.T.; Nascimento,A.A.; Santos-Gonçalves,A.P.
Aulonemia aristulata (Döll) McClure is a lignified bamboo species endemic to Brazil. This species occurs in southeastern forests and can reach high density at forest edges, dominating the understory of canopy-disturbed forest patches. The goal of this study was to describe the flowering period, floral biology, fruiting and seedling recruitment of A. aristulata in natural conditions in two areas located in a segment of the Atlantic Forest. Data on the morphology of the synflorescences and florets, timing and sequence of the anthesis events and floral visitors were recorded. Natural pollinators (open pollination or control) as well as spontaneous self-pollination were also checked. Pollen viability was estimated using the acetocarmine technique. Aulonemia...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Floral biology; Gregarious flowering; Gynomonoecy; Protandry; Tropical forest.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042011000100012

Structure and dynamics of a woody plant community of a tropical semi-deciduous seasonal forest in the "Estação Ecológica do Panga", municipality of Uberlândia, Minas Gerais, Brazil
Provedor de dados: 88
Autores: Paiva,Luciana Vieira de; Araújo,Glein Monteiro de; Pedron,Fernando.
Studies of plant community dynamics are essential in understanding the demographic patterns of species since changes in demographic rates can affect the floristic composition and future structure. The purpose of the present study was to analyze the changes in the community structure and floristic composition of woody plants in a tropical semi-deciduous forest in Uberlândia in central Brazil, during a 10-years period. The data were collected in 1989 and in 2000 in 50 quadrats (10 m x 10 m) where all trees with a minimum circumference at breast height of 10 cm were sampled. In 1989, 93 species and 1103 individuals were registered. Over a period of 10 years, seven new species were added to the community, although eight disappeared. The main change that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth; Mortality; Recruitment; Tropical forest.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000300003

Litter accumulation and its effect on seedling recruitment in a Southeast Brazilian Tropical Forest
Provedor de dados: 88
Autores: SANTOS,SANDY LIA DOS; VÁLIO,IVANY F.M.
Litter directly and indirectly affects germination and development of seedlings through physical and chemical effects, being an important factor in the determination of plant community. The monthly accumulation of litter was studied from November 1996 to September 1998 and its relation to climatic factors (such as rainfall, photoperiod and temperature). Also the litter effect on the recruitment of seedlings was observed in the Mata de Santa Genebra (22°49'45" S - 47°06'33" W). The correlation between litter accumulation and climatic factors was very weak. Under the canopy, the removal of the litter layer increased seedling emergence. Seedling mortality was very high, even in the rainy season. This can be due possibly by the low light intensity under the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Litter accumulation; Seedling recruitment; Climatic factors; Tropical forest.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000100011

Comparação de dois métodos de avaliação da fenologia de plantas, sua interpretação e representação
Provedor de dados: 88
Autores: BENCKE,CINARA S.C.; MORELLATO,L. PATRÍCIA C.
Este trabalho compara dois métodos de avaliação fenológica e sua representação gráfica. O estudo foi desenvolvido no Núcleo Picinguaba, Ubatuba, Estado de São Paulo (23º22' S e 44º48' W), em três formações florestais: floresta de restinga, floresta de planície e floresta de encosta. A floração, frutificação, queda de folhas e brotamento foram estimados mensalmente para cada indivíduo arbóreo, durante 18 meses. Foram comparados: i) percentual de intensidade de Fournier ou índice de intensidade: escala intervalar de cinco categorias de 0 a 4, com intervalo de 25% entre classes; e ii) índice de atividade ou porcentagem de indivíduos. O índice de atividade e o percentual de intensidade de Fournier forneceram informações distintas e complementares, facilitando...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Phenology; Methods; Tropical forest; Synchrony.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000300003

Sampling strategies for tropical forest nutrient cycling studies: a case study in São Paulo, Brazil
Provedor de dados: 90
Autores: Sparovek,G.; Camargo,O. A.
The precise sampling of soil, biological or micro climatic attributes in tropical forests, which are characterized by a high diversity of species and complex spatial variability, is a difficult task. We found few basic studies to guide sampling procedures. The objective of this study was to define a sampling strategy and data analysis for some parameters frequently used in nutrient cycling studies, i. e., litter amount, total nutrient amounts in litter and its composition (Ca, Mg, Κ, &amp;#925; and P), and soil attributes at three depths (organic matter, Ρ content, cation exchange capacity and base saturation). A natural remnant forest in the West of São Paulo State (Brazil) was selected as study area and samples were collected in July, 1989. The total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical forest; Utter; Soil nutrients; Variability.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831997000400014

Contribution of Topography and Incident Solar Radiation to Variation of Soil and Plant Litter at an Area with Heterogeneous Terrain
Provedor de dados: 90
Autores: Nettesheim,Felipe Cito; Conto,Tiago de; Pereira,Marcos Gervasio; Machado,Deivid Lopes.
Natural processes that determine soil and plant litter properties are controlled by multiple factors. However, little attention has been given to distinguishing the effects of environmental factors from the effects of spatial structure of the area on the distribution of soil and litter properties in tropical ecosystems covering heterogeneous topographies. The aim of this study was to assess patterns of soil and litter variation in a tropical area that intercepts different levels of solar radiation throughout the year since its topography has slopes predominantly facing opposing geographic directions. Soil data (pH, C, N, P, H+Al, Ca, Mg, K, Al, Na, sand, and silt) and plant litter data (N, K, Ca, P, and Mg) were gathered together with the geographic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical forest; Spatial factors; Environmental factors; Slope geographic orientation; Soil chemistry; Litter chemistry.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000300750

Maximum leaf photosynthetic light response for three species in a transitional tropical forest in Southern Amazonia
Provedor de dados: 91
Autores: Miranda,Eduardo J.; Priante Filho,Nicolau; Priante,Pedro C.; Campelo Jr.,José H.; Suli,George S.; Fritzen,Clóvis L.; Nogueira,José de S.; Vourlitis,George L.
Measurements of CO2 and water vapor flux using eddy covariance are being made from a 40 m tower located in a transitional tropical forest near Sinop Mato Grosso. As complementary information to this study, the photosynthetic light response curves of three species located near the tower were measured at different heights in the forest canopy and light conditions with the objective of understanding seasonal and spatial (height in the forest canopy and gap or shade located plants) trends in the photosynthetic light response. The measurements were made in a canopy emergent tree (30 m tall) identified as Brosimum lactescens, and in two relatively short plants (0.6 to 1.6 m height) identified as Quiina pteridophylla and Diniszia excelsa located in different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eddy covariance; Tropical forest; Photosynthetic light.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662004000100024

Diversity of wasps (Hymenoptera: Aculeata: Vespidae) along an altitudinal gradient of Atlantic Forest in Itatiaia National Park, Brazil
Provedor de dados: 92
Autores: Ribeiro,Daniele Guedes; Silvestre,Rogerio; Garcete-Barrett,Bolívar R.
ABSTRACT Surveying the diversity of stinging wasps (Hymenoptera: Aculeata) provides an important information base to assist in biodiversity conservation and the management of forest reserves, as wasps depend on and maintain the population balance of several other groups of insects. In accordance, this paper presents an altitudinal survey of wasps (Hymenoptera, Aculeata, Vespidae) in Itatiaia National Park, Brazil, which is a protected area covered by Atlantic Forest in a mountainous landscape, with altitudes ranging between 540 and 2791 metres above sea level. Six altitudinal zones were sampled with entomological net, and the abundance and diversity of the species were indicated by zones. Field sampling took 288 h of discontinuous activity, which was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity hotspot; Eumeninae; Polistinae; Richness; Tropical forest.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262019000100022

Spatial variation of dung beetle assemblages associated with forest structure in remnants of southern Brazilian Atlantic Forest
Provedor de dados: 92
Autores: Silva,Pedro Giovâni da; Hernández,Malva Isabel Medina.
ABSTRACT The Brazilian Atlantic Forest is one of the world's biodiversity hotspots, and is currently highly fragmented and disturbed due to human activities. Variation in environmental conditions in the Atlantic Forest can influence the distribution of species, which may show associations with some environmental features. Dung beetles (Coleoptera: Scarabaeinae) are insects that act in nutrient cycling via organic matter decomposition and have been used for monitoring environmental changes. The aim of this study is to identify associations between the spatial distribution of dung beetle species and Atlantic Forest structure. The spatial distribution of some dung beetle species was associated with structural forest features. The number of species among the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta diversity; Species composition; Species diversity; Spatial distribution; Tropical forest.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262016000100073

Phytobia (Diptera: Agromyzidae) from Brazil: new species, new record and a key to the Neotropical species
Provedor de dados: 103
Autores: Sousa,Viviane Rodrigues de; Couri,Márcia Souto.
ABSTRACT Phytobia Lioy, 1864 flies occur in all continents. There are four recorded species of these flies in Brazil, but recent expeditions at unexplored areas in the country have revealed that the genus is far more diverse than previously known. Based on material collected in the states of Mato Grosso, Mato Grosso do Sul, and Rondônia (as part of the SISBIOTA Diptera Project), we describe fourteen new species of Phytobia. Additionally, we redescribe P. kallima (Frost), previously recorded only from Panama, and provide a key to the 32 resulting Neotropical species. All descriptions include details and illustrations of the male and female terminalia. The speciemens are deposited in the collections of Museu de Zoologia, Universidade de São Paulo (São Paulo,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian species; Leaf-mining flies; Morphology; Taxonomy; Tropical forest.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702017000100334

The use of the point count method for bird survey in the Atlantic forest
Provedor de dados: 103
Autores: Volpato,Graziele H.; Lopes,Edson V.; Mendonça,Luciana B.; Boçon,Roberto; Bisheimer,Maria V.; Serafini,Patrícia P.; Anjos,Luiz dos.
The point count method has been widely used in tropical forest for sampling bird communities. In the present study, we investigated if data on richness and abundance acquired using the point count method are different comparing spring/summer (breeding season) and fall/winter (non-breeding season) in three types of the Brazilian Atlantic forest. Twelve sites were sampled seasonally during one year. In general we recorded more species and individuals during the breeding seasons. However, bird communities vary seasonally among the forest types and functional groups. We demonstrate that the use of point counts in tropical forest should be adjusted considering the differences in forest types and feeding guilds.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birds; Feeding guild; Seasonal changes; Survey method; Tropical forest.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100012

Density and richness of leaf litter frogs (Amphibia: Anura) of an Atlantic Rainforest area in the Serra dos Órgãos, Rio de Janeiro State, Brazil
Provedor de dados: 103
Autores: Siqueira,Carla C.; Vrcibradic,Davor; Almeida-Gomes,Mauricio; Borges-Junior,Vitor N. T.; Almeida-Santos,Patrícia; Almeida-Santos,Marlon; Ariani,Cristina V.; Guedes,Diego M.; Goyannes-Araújo,Pablo; Dorigo,Thiago A.; Van Sluys,Monique; Rocha,Carlos F. D.
Data on species composition, richness, and density are presented for the leaf litter frog assemblage of an area of Atlantic Rainforest at the Serra dos Órgãos mountain range, in the state of Rio de Janeiro, southeastern Brazil. Three sampling methods were used: plot sampling, visual encounter surveys, and pitfall traps. The local assemblage of leaf litter frogs was composed of 16 species, with the direct-developing species, Euparkerella brasiliensis (Parker, 1926), being the most abundant. The estimated density of the local leaf litter frog assemblage based on plot sampling was 17.1 ind/100 m² and the estimated overall leaf litter frog mass was 684.2 g/ha. The estimated density of leaf litter frogs at the present study is the highest currently reported for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibian survey; Relative abundance; Tropical forest.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100015

Structure of the leaf litter frog community in an area of Atlantic Forest in southeastern Brazil
Provedor de dados: 103
Autores: Vagmaker,Natália; Pereira-Ribeiro,Juliane; Ferreguetti,Átilla Colombo; Boazi,Alex; Gama-Matos,Rayanne; Bergallo,Helena Godoy; Rocha,Carlos Frederico Duarte.
ABSTRACT Different spatial and temporal factors can influence the species richness and abundance of leaf anurans that are fundamental for the ecosystem functioning, as they act as predators and integrate the trophic chain as prey of other animals. There are relatively few studies that aimed to understand the spatio-temporal variation and the influence of environmental factors on leaf litter communities. We studied parameters of the anuran community living in the forest leaf litter in the Duas Bocas Biological Reserve (DBBR), Espírito Santo, Brazil. We sought to understand the extent to which richness, abundance, biomass and density varied between two locations with different stages of preservation (primary and secondary forest). In addition, we tested the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibians; Amphibian abundance; Environmental variables; Frog density; Tropical forest.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702020000100316

Ocorrência de Aglae caerulea Lepeletier &amp;amp; Serville (Hymenoptera, Apidae, Apini, Euglossina) no estado do Acre, Brasil
Provedor de dados: 104
Autores: Morato,Elder Ferreira.
This note reports tor the first time the presence of Aglae caerulea Lepeletier &amp;amp; Serville, 1825 in the State of Acre, Western Amazonia. Three male bees were recorded in the "Parque Nacional da Serra do Divisor" with traps baited with methyl cinnamate. A general description of the sampling sites is provided.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Euglossina; Aglae caerulea; Acre; Amazonia; Tropical forest.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000300034

Fine-root production in two secondary forest sites with distinct ages in Eastern Amazon
Provedor de dados: 36
Autores: Lima,Tâmara Thaiz Santana; Miranda,Izildinha Souza; Vasconcelos,Steel Silva.
The objective of this work was to assess the fine-root (≤ 2 mm diameter) production dynamics of two forest regrowths at different ages. Fine-root production was monitored by the ingrowth core method in one 18-year-old site (2 ha) and one 10-year-old site (0.5 ha), both localized in the Apeú region, Northern Pará State, Brazil. The sites were abandoned after successive shifting cultivation, beginning in 1940. Monthly production of live fine-root was similar between sites and was influenced by rainfall seasonality, with higher production during the dry season than the wet season for mass and length. However, mortality in terms of mass was higher in the 10-year-old site than in the 18-year-old site. The seasonality influenced mortality only in the 18-year old...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought; Root biomass; Seasonality; Succession; Tropical forest.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672012000100012

Biomass equations for forest regrowth in the eastern Amazon using randomized branch sampling
Provedor de dados: 36
Autores: Ducey,Mark Jonathan; Zarin,Daniel Jacob; Vasconcelos,Steel Silva; Araújo,Maristela Machado.
Forest regrowth occupies an extensive and increasing area in the Amazon basin, but accurate assessment of the impact of regrowth on carbon and nutrient cycles has been hampered by a paucity of available allometric equations. We develop pooled and species-specific equations for total aboveground biomass for a study site in the eastern Amazon that had been abandoned for 15 years. Field work was conducted using randomized branch sampling, a rapid technique that has seen little use in tropical forests. High consistency of sample paths in randomized branch sampling, as measured by the standard error of individual paths (14%), suggests the method may provide substantial efficiencies when compared to traditional procedures. The best fitting equations in this...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Allometric equations; Secondary growth; Tropical forest.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672009000200013

Logging impact on Amazonian white-sand forests: perspectives from a sustainable development reserve
Provedor de dados: 36
Autores: DEMARCHI,Layon Oreste; SCUDELLER,Veridiana Vizoni; MOURA,Livia Carvalho; LOPES,Aline; PIEDADE,Maria Teresa Fernandez.
ABSTRACT Overexploitation is one of the main causes of biodiversity loss and local extinction. In the Brazilian Amazon, the intensive use of high-value timber species is leading to a decline in their populations. When in decline, these species can be replaced by less valuable and more common ones that are more feasible to exploit. We conducted interviews with residents of two communities in a sustainable development reserve in central Amazonia, and used free lists and the cognitive salience index (S) to assess the perceptions of residents regarding the occurrence and purpose of timber exploitation, and to identify possible endangered species in white-sand and terra-firme forests. In addition, to infer possible consequences of logging, we assessed the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cognitive salience index; Timber species; Tropical forest; Oligotrophic ecosystem; Tupé Sustainable Development Reserve; Mezilaurus itauba.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672019000400316

Conidial fungi associated with leaf litter of red cedar (Cedrela odorata) in Belém, Pará (eastern Brazilian Amazon)
Provedor de dados: 36
Autores: SANTOS,Renato Ferreira dos; SOTÃO,Helen Maria Pontes; MONTEIRO,Josiane Santana; GUSMÃO,Luís Fernando Pascholati; GUTIÉRREZ,Antonio Hernández.
ABSTRACT The aim of this study was to investigate the species of conidial fungi associated with leaf litter of Cedrela odorata (Meliaceae), an endangered red cedar species typical of Amazonian terra-firme forests. Conidial fungi were sampled around C. odorata individuals in three forest areas in the municipality of Belém (Pará State, Brazil). A total of 104 species were identified, with 53 new records for the state of Pará, 46 first records for the Brazilian Amazon, including new records for Brazil (Cordana abramovii), for South America (Acarocybiopsis cubitaensis, Xylocladium claviforme) and for the Americas (Dactylaria biguttulata). A review of species of conidial fungi reported on C. odorata is provided, indicating its distribution in Brazil. For each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascomycota; Hyphomycetes; Meliaceae; Tropical forest.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000300230

Temporal distribution of fruit-feeding butterflies (Lepidoptera, Nymphalidae) in the eastern extreme of the Amazon region
Provedor de dados: 36
Autores: ARAUJO,Elias da Costa; MARTINS,Lucas Pereira; DUARTE,Marcelo; AZEVEDO,Gisele Garcia.
ABSTRACT Rainfall is one of the most influential factors driving insect seasonality in the Amazon region. However, few studies have analyzed the temporal dynamics of fruit-feeding butterflies in the Brazilian Amazon, specially in its eastern portion. Here, we evaluated the diversity patterns and temporal distribution of fruit-feeding butterflies in a remnant of eastern Amazon forest in the Baixada Maranhense, northeastern Brazil. Specifically, we tested whether fruit-feeding butterflies are temporally structured and whether rainfall influences species richness and abundance. Butterflies were collected with baited traps in both the rainy and dry seasons for two consecutive years. In total, we captured 493 butterflies belonging to 28 species, 15 genera and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Amazon; Frugivorous butterflies; Maranhão; Seasonality; Temporal diversity; Tropical forest.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000100012

Structure and composition of the ground-herb community in a terra-firme Central Amazonian forest
Provedor de dados: 36
Autores: Costa,Flávia Regina Capellotto.
The herb community of tropical forests is very little known, with few studies addressing its structure quantitatively. Even with this scarce body of information, it is clear that the ground herbs are a rich group, comprising 14 to 40% of the species found in total species counts in tropical forests. The present study had the objective of increasing the knowledge about the structure and composition of the ground-herb community and to compare the sites for which there are similar studies. The study was conducted in a tropical non-inundated and evergreen forest 90 km north of Manaus, AM. Ground herbs were surveyed in 22 transects of 40 m², distributed in five plots of 4 ha. The inventoried community was composed of 35 species, distributed in 24 genera and 18...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Community structure; Herbs; Tropical forest; Understory.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672004000100007

Diversity of bryophytes in priority areas for conservation in the Atlantic forest of northeast Brazil
Provedor de dados: 39
Autores: Silva,Mércia Patrícia Pereira; Pôrto,Kátia Cavalcanti.
The northeastern Brazilian Atlantic forest is the region with the greatest diversity of bryophytes in the country. However, knowledge about bryophytes is irregularly distributed among Brazilian regions. Therefore, we aimed to contribute to knowledge about bryophytes on a regional scale in the northeastern Atlantic forest, to identify the centers of bryophyte diversity in that region, and to reiterate the importance and identify locations for which new protected areas should be created. We built a database of bryophytes in 23 locations of the region, based on a literature review and new floristic inventories. To identify the locations of greatest relevance to bryophyte conservation, we considered 1) total and endemic species richness, 2) phylogenetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation units; Liverwort; Moss; Richness; Tropical forest.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000100016

Local environmental controls of Atlantic Forest tree community assembly on a coastal continental island in southeastern Brazil
Provedor de dados: 39
Autores: Nettesheim,Felipe Cito; Garbin,Mário Luís; Pereira,Marcos Gervasio; Araujo,Dorothy Sue Dunn de.
ABSTRACT Tropical forests with high species diversity are commonly found in rugged montane areas. We investigated causes of local tropical forest tree community assembly on a continental island with heterogeneous terrain. We recorded tree community (absolute species abundance), topography, soil, litter and location in 40 sampling units on two opposite sides of the island with similar heterogeneous terrain. We used transformation based Redundancy Analyses and variation partitioning to determine the contribution of environment (topography, soil and litter), spatial structure (geographic location and Moran Eigenvector Maps) and the shared effects of these to explain community assembly. The environment made a significant contribution to explain tree community...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Community composition; Community structure; Floristics; Neutral; Niche; Soil; Spatial structure; Topography; Tropical forest.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100088

Sphagnum (velvet) species used by rural communities at the Guaratuba EPA, Paraná State, Brazil - doi: 10.4025/actascibiolsci.v34i2.7055
Provedor de dados: 3
Autores: Negrelle, Raquel Rejane Bonato; Universidade Federal do Paraná; Bordignon, Suelen Elizabeth; Universidade Federal do Paraná; Yano, Olga; Instituto de Botânica.
The results of a survey of Sphagnum used by the Descoberto and Empanturrado rural communities (Guaratuba municipality and Guaratuba Environmental Protected Area – EPA) are presented. The analysis was based on fresh material collected in different harvesting areas. Five species were recorded: S. capillifolium (Ehrh.) Hedw., S. cuspidatum Ehrh. ex Hoffm., S. erythrocalyx Hampe, S. perichaetiale Hampe and S. recurvum P. Beauv.. All of them are native species that grow spontaneously in that region and are intensively harvested by the local community. A key is presented to differentiate the species, and the botanical description, common names, geographic distribution and illustrations for each species are included.
Tipo: Coleta e identificação botânica
Palavras-chave: 2.00.00.00-6 non-wood forest product; Bryophytes; Atlantic Forest; Tropical forest; Harvesting 2.03.06.00-8.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/7055

DECOMPOSITION, DYNAMIC OF INORGANIC ELEMENTS AND MICROBIAL COLONIZATION OF ARARIBÁ (Centrolobium tomentosum Guill. ex Benth) LEAVES ON LATOSOLS OF BRAZILIAN ATLANTIC FOREST
Provedor de dados: 113
Autores: Marques,Márcia S.; Sá,Nadja M.; Scotti,María R.
Leguminous trees are being planted in order to establish restoration units in the Brazilian Atlantic forest ecosystem. The success of the establishment depends on the growth, productivity of plants and litter decomposition rates. The objective of this study was to investigate the decomposition of araribá (Centrolobium tomentosum Guill. Ex Benth) leaves, at two sites. Site 1 was an experimental plantation of the native species C. tomentosum, which was inoculated with rhizobia plus mycorrhizal fungi, and Site 2 was a eucalyptus (Eucalyptus grandis W. Hill ex Maiden) forest. The leaf litter of C. tomentosum was incubated for 120, 240 and 360 days in both sites. The decomposition rate and dynamic of mineralization of the organic matter and the nutrients K, Mg,...
Tipo: Journal article
Palavras-chave: Decomposition; Eucalyptus sp.; Microbial colonization; Tropical forest; Soil fertility.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000100008

Sensitivity of understorey bird species in two different successional stages of the lowland Atlantic Forest, Brazil
Provedor de dados: 42
Autores: Loures-Ribeiro,Alan; Manhães,Marco A.; Dias,Manoel M.
The Atlantic Forest has a high destruction rate and there is little information available on some aspects of the neotropical bird biology. Changes in environment are important factors that affect the resources available to birds. We compared the species sensitivity level of understorey birds in two areas in distinct successional stages (primary and secondary sections). Two 100 ha plots of lowland Atlantic Forest were analysed between August and December 2006. Among 25 bird species recorded, thirteen had lower abundance in secondary forest, two in primary forest, and ten had not clear tendency. According to the criteria used, the percentages for species with low, and medium and high sensitivity to habitat change were 44% and 56%, respectively. The number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Neotropical birds; Point counts; South America; Tropical forest.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300016

A new world natural vegetation map for global change studies
Provedor de dados: 42
Autores: Lapola,David M.; Oyama,Marcos D.; Nobre,Carlos A.; Sampaio,Gilvan.
We developed a new world natural vegetation map at 1 degree horizontal resolution for use in global climate models. We used the Dorman and Sellers vegetation classification with inclusion of a new biome: tropical seasonal forest, which refers to both deciduous and semi-deciduous tropical forests. SSiB biogeophysical parameters values for this new biome type are presented. Under this new vegetation classification we obtained a consensus map between two global natural vegetation maps widely used in climate studies. We found that these two maps assign different biomes in ca. 1/3 of the continental grid points. To obtain a new global natural vegetation map, non-consensus areas were filled according to regional consensus based on more than 100 regional maps...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Natural vegetation; Tropical forest; Biome; Phytogeography; Biogeophysical parameters; Vegetation map.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000200017

Comparison of Polycyclic Aromatic Hydrocarbon (PAHs) concentrations in urban and natural forest soils in the Atlantic Forest (São Paulo State)
Provedor de dados: 42
Autores: Bourotte,Christine; Forti,Maria Cristina; Lucas,Yves; Melfi,Adolpho J.
Studies about pollution by Polycyclic Aromatic Hydrocarbons (PAHs) in tropical soils and Brazil are scarce. A study was performed to examine the PAHs composition, concentrations and sources in red-yellow Oxisols of remnant Atlantic Forest of the São Paulo State. Sampling areas were located in an urban site (PEFI) and in a natural one (CUNHA).The granulometric composition, pH, organic matter content and mineralogical composition were determined in samples of superficial soils. The sum of PAHs (ΣHPAs) was 4.5 times higher in the urban area than in the natural one. Acenaphthylene, acenaphthene, fluorene, phenanthrene and fluoranthene have been detected in the soils of both areas and presented similar concentrations. Acenaphthene and fluorene were the most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Polycyclic aromatic hydrocarbons; PAHs; Tropical forest; Tropical soils; Urban soils.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100013

How a simple and stereotyped acoustic signal transmits individual information: the song of the White-browed Warbler Basileuterus leucoblepharus
Provedor de dados: 42
Autores: Aubin,Thierry; Mathevon,Nicolas; Silva,Maria Luisa da; Vielliard,Jacques M.E.; Sebe,Frederic.
The White-browed Warbler Basileuterus leucoblepharus, a common bird of the BrazilianAtlantic forest, emits only one distinct song type in the context of territorial defense. Individual or neighbor-stranger recognition may be more difficult when birds share similar songs. In fact, the analysis of songs of different individuals reveals slight differences in the temporal and the frequency domains. Effectively, a careful examination of the signals of different individuals (21) by 5 complementary methods of analysis reveals first, that one or two gaps in frequency occur between two successive notes at different moments of the song, and second, that their temporal and frequency positions are stereotyped for each individual. Playback experiments confirm these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bird acoustic communication; Individual information; Tropical forest.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000200022

Butterflies of Amazon and Cerrado remnants of Maranhão, Northeast Brazil
Provedor de dados: 49
Autores: Martins,Lucas Pereira; Araujo Junior,Elias da Costa; Martins,Ananda Regina Pereira; Colins,Mairla Santos; Almeida,Gabriela Cristina Fonseca; Azevedo,Gisele Garcia.
Abstract Species inventories are important tools to evaluate biodiversity losses and contribute to the conservation of endangered areas. The Amazon and Cerrado are the largest Brazilian biomes and represent some of the most threatened regions of the country. Due to its location between these biomes, the state of Maranhão, Northeast Brazil, possesses a great variety of habitats and a high local diversity. Nonetheless, few faunistic inventories of diversified groups have been performed in the state. In the specific case of butterflies, a well-known biological indicator, no inventories have been published in the past years. This study aimed to expand the knowledge on the composition of butterflies in Amazon and Cerrado remnants of Maranhão. Butterflies were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical forest; Diversity; Lepidoptera; Neotropical region; Savanna.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032017000300303

RAPELD: a modification of the Gentry method for biodiversity surveys in long-term ecological research sites
Provedor de dados: 49
Autores: Magnusson,William E.; Lima,Albertina P.; Luizão,Regina; Luizão,Flávio; Costa,Flávia R. C.; Castilho,Carolina Volkmer de; Kinupp,V. F.
Our objectives were to develop a method that would be appropriate for long-term ecological studies, but that would permit rapid surveys to evaluate biotic complementarity and land-use planning in Amazonia. The Amazon basin covers about 7 million km². Therefore, even a sparse coverage, with one sample site per 10.000 km², would require about 700 sampling sites. Financial considerations limit the number of sites and investment at each site, but incomplete coverage makes evaluation of biotic complementarity difficult or impossible (Reddy &amp;amp; Dávalos 2003). Our next challenge is to install similar systems throughout Amazonia. The cost, based on modification of Al Gentry's original design is moderate (less than US$ 50.000 per site if it is not necessary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical forest; Inventory; Plot size; Plot shape; Biotic complementarity; Survey; Land-use planning.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032005000300002

Gilbertiodendron grandistipulatum (Leguminosae-Caesalpinioideae), a singular species from West Central Africa and new record for Congo (Brazzaville)
Provedor de dados: 51
Autores: De La Estrella,Manuel; Devesa,Juan Antonio.
Gilbertiodendron (Leguminosae-Caesalpinioideae) is an endemic tropical African genus of ca. 30 species, most of which are trees of primary forest. The highest concentration of species and morphological variation is found in the Guineo-Congolian region, particularly in Gabon. One of those species is G. grandistipulatum, which is easily recognized by its stipules (up to 18 cm long) and flowers (adaxial petal up to 12.5 × 14 cm). The taxonomy, habitat and distribution of G. grandistipultaum are discussed, extending its known distribution to Congo. A full description, distribution map and two illustrations are provided for the first time for this species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Congo; Detarieae; Gabon; Taxonomy; Tropical forest.
Ano: 2014
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722014000100016

Spatial and temporal variation in the canopy cover in a tropical semi-deciduous forest
Provedor de dados: 52
Autores: Bianchini,Edmilson; Pimenta,José A.; Santos,Flavio A. M. dos.
This study was developed in the Mata dos Godoy State Park (23° 27’S, 51° 15’W) South Brazil which present great environmental heterogeneity when its north portion (ridge) is compared with the southern portion (valley), where there are some flooded areas. The forest formation is classified as tropical semi-deciduous forest. Spatial and temporal variations in the degree of the canopy cover were compared at flooded and unflooded sites. The measures were taken seasonally in 100m² plots using a spherical densiometer from spring 1995 to winter 1996. The flooded area was more open and lighter and had a greater spatial and temporal variation in the canopy cover than the unflooded areas. The greater heterogeneity in the flooded area could be due to structural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canopy; Flooding; Seasonality; Spatial heterogeneity; Tropical forest.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000300008

Seedling growth of understorey species of a Southeast Brazilian tropical forest
Provedor de dados: 52
Autores: Válio,Ivany Ferraz Marques.
Thirteen understorey species of a mesophyllous tropical forest were studied under two different photosynthetic photon flux densities (PPFD). Seedlings were grown in the glasshouse under 51% and 2.6% solar PPFD. Growth of the seedlings was evaluated by 1-) total height; 2-) leaf number; 3-) leaf dry mass;4-) stem dry mass; 5-) root dry mass; 6-) stem length/mass; 7-)shoot/root mass; 8-) percent allocation to leaf, stem and roots. For most of the parameters recorded, low PPFD drastically reduced growth. It seemed that the strategy of these understorey species was a reduction of growth under low PPFD saving energy for survival.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seedling growth; Understorey species; Shade; Tropical forest.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400024

Comparative phytosociology of tree sinusiae between contiguous forests in different stages of succession
Provedor de dados: 57
Autores: CAVALCANTE,A. DE M. B.; SOARES,J. J.; FIGUEIREDO,M. A.
The Baturité Mountain Range, located in the State of Ceará (BRA), displays on its highest levels a vegetation viewed as a disjunction from the Atlantic Forest in the East of Brazil. Among the various attributes associated with this vegetation, the abundance of water resources and a high biodiversity have a more outstanding relevance. However, in view of the current accelerated deforestation process, those attributes may be threatened in a near future. Therefore, the present work is a comparative study with its focus on vegetal community organization (tree sinusiae) and the floristic similarity and the phytodiversity of two areas in different successive stages, preserved and deforested 24 years ago. The aim of that intent was to obtain information that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical forest; Phytosociology; Vegetation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400003

Testing road surface treatments to reduce erosion in forest roads in Honduras
Provedor de dados: 118
Autores: Rivera,Samuel; Kershner,Jeffrey L; Keller,Gordon R.
Using forest roads produces more erosion and sedimentation than any other forest or agricultural activity. This study evaluated soil losses from a forest road in central Honduras over two consecutive years. We divided a 400-m segment of road into 8 experimental units, each 50 m in length. Four units were treated with Best Management Practices (BMPs) and four were left untreated. The BMP treatments included reshaping the road prism, installing culverts and reshaping of road ditches, compacting 20-cm layers of the road tread, crowning the road surface (3% slope, double drainage), longitudinal sloping (less than 12%), and adding a 10-cm layer of gravel (crush size = 0.63 cm). Soil movement was measured daily during the rainy seasons. The highest soil loss...
Tipo: Journal article
Palavras-chave: Erosion; Forest roads; Honduras; Road surface; Soil; Tropical forest.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300009