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Registros recuperados: 34
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Analysis of rice sheath blight epidemics in the tropics International Rice Research Institute
Castilla, Nancy P..
xxi, 185 leaves : ill. Thesis (D. Sci.) -- Universite de Paris-Sud
Tipo: Thesis Palavras-chave: Blight; Rice; Bacterial diseases of plants; Epidemiology; Tropics; Rice sheath blight.
Ano: 1998 URL: http://hdl.handle.net/123456789/557
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Can Logging in Equatorial Africa Affect Adjacent Parks? Ecology and Society
Baidya Roy, Somnath; Princeton University; sbroy@duke.edu; Walsh, Peter D; Princeton University; walsh@eva.mpg.de; Lichstein, Jeremy W; Princeton University; jwl@princeton.edu.
Tropical deforestation can cause fundamental regional-scale shifts in vegetation structure and diversity. This is particularly true in Africa. Although national parks are being established to protect areas from deforestation and to conserve biodiversity, these parks are not immune to disturbances outside their boundaries. We used regional-scale atmospheric simulation experiments to investigate how deforestation in timber concessions might affect precipitation inside adjacent, undisturbed national parks in the equatorial African countries of Gabon and the Republic of Congo. The experiments revealed a complex response. Some parks showed rainfall reduced as much as 15%, while others showed slight increases. Rainfall inside parks was particularly sensitive to...
Tipo: Peer-Reviewed Reports Palavras-chave: Deforestation; Logging; Precipitation; Climate change; Africa; Tropics; National park.
Ano: 2005
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Challenges to Organic Farming and Sustainable Land Use in the Tropics and Subtropics JARTS
Joergensen, Rainer Georg.
The central aim of Organic Farming is to maintain and improve soil fertility as a means of supporting animal health by species-adapted animal keeping and feeding. These two aims have developed from the basic desire of many human beings to live in harmony with nature, ultimately emanating from a wish to sustain their own health.In industrialised countries of temperate humid climate, diseases of modern civilisation have been developing at an alarming rate. One of the main reasons is excessive and incorrect nutrition, resulting from alienation in preparing and making our own foodstuffs. In this respect, food procurement today looks at qualitative aspects, i.e. at changes in nutritional habits, especially at a reduction of excessive meat consumption, but also...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic Farming organic farming; Sustainable agriculture; Tropics; Subtropics.
Ano: 2002 URL: http://www.jarts.info/index.php/jarts/article/view/4
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Comunidade de formigas que nidificam em pequenos galhos da serrapilheira em floresta da Amazônia Central, Brasil Rev. Bras. entomol.
Carvalho,Karine S.; Vasconcelos,Heraldo L..
Community of ants that nest in dead twigs on the ground of Central Amazonian forest, Brazil. A total area of 2,880 m² in four forest sites, near Manaus, Brazil, was searched for ant colonies nesting in dead twigs on the ground. An amount of 3,706 twigs (0.5-5 cm in diameter) were gathered, of which only 623 (16.8%) had ants, which is equivalent to a density of 0.22 nests per m². Seventy species have been found. The predominant genera were Pheidole (Westwood), Crematogaster (Lund), and Solenopsis (Westwood). For most species, many of the nests found had only workers and brood, suggesting that colonies either use multiple twigs to nest or do not live exclusively in the twigs, using other types of substrate (e.g., leaf-litter, soil, fruit pods) to nest. Most...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ants; Central Amazon; Formicidae; Litter invertebrates; Tropics.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262002000200002
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Diameter and height distributions in a gallery forest tree community and some of its main species in central Brazil over a six-year period (1985-1991) Rev. Bras. Bot.
Felfili,Jeanine Maria.
(Diameter and height distributions in a gallery forest tree community and some of its main species in central Brazil over a six-year period (1985-1991)). The diameter and height structure were studied over six years in approximately 64 ha of the Gama gallery forest in Brasília, DF. Trees from 10 cm dbh were measured every three years from 1985 in 151 (10 x 20 m) permanent plots. Natural regeneration (individuals under 10 cm dbh) was measured in subplots within the 200 m² plots. Most individuals and species were under 45 cm diameter and 20 m high while the maximum diameter for individual species ranged from 30 to 95 cm. The diameter structure was typical of a mixed tropical forest with the number of individuals decreasing with increasing size classes and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diameter; Height; Gallery forest; Tropics; Community structure.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041997000200006
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EFFECTS OF FUNGICIDES ON ENDOPHYTIC FUNGI AND PHOTOSYNTHESIS IN SEEDLINGS OF A TROPICAL TREE, Guarea guidonia (Meliaceae) Acta biol.Colomb.
GAMBOA GAITÁN,MIGUEL A.; WEN,SHIYUN; FETCHER,NED; BAYMAN,PAUL.
Endophytes are microorganisms that live within healthy plant tissues, and include fungi and bacteria. They can be mutualists, comensals or even latent pathogens. Presence of these endosymbionts may affect host physiology, for example by consuming products of photosynthesis (endophytes are heterotrophs) or producing toxic metabolites. In this work two fungicides were used to eliminate fungal endophytes from seedlings of Guarea guidonia. Lightsaturated photosynthesis (Amax) was measured in endophytefree plants and compared with control plants. Each fungicide killed different fungal endosymbionts. Phomopsis was more susceptible to benomyl while Colletotrichum was more susceptible to propiconazole. Although suggestive, values of Amax were not significantly...
Tipo: Journal article Palavras-chave: Endophytes; Tropics; Photosynthesis; Fungicides; Guarea.
Ano: 2005 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2005000200003
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Environmental determinants for natural regeneration of gallery forest at the Cerrado/Amazonia boundaries in Brazil Acta Amazonica
Marimon,Beatriz Schwantes; Felfili,Jeanine Maria; Lima,Edson de Souza; Duarte,Wânia M. Gonçalves; Marimon-Júnior,Ben Hur.
Natural regeneration and structure and their relationship to environmental variables were studied in three sections of a gallery forest, in Eastern Mato Grosso, Brazil (14º43′S and 52º21′W). The assumption was that natural regeneration is constrained by environmental determinants at all stages of development of the tree community. The objective was to analyse the forest structure and to verify the relationship between species distribution and abundance at different stages of regeneration and environmental variables. In each section, 47 contiguous (10x10m) permanent plots were established to sample trees (gbh≥15cm), following a systematic design. Seedlings (0.01 to 1m height), saplings (1.01 to 2m) and poles (from 2.01m height to gbh<15cm) were sampled...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazil; Diversity; Riparian forest; Soils; Tropics.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672010000100014
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Evaluation of some reproductive traits of Pelibuey ewes under humid tropical conditions of Mexico R. Bras. Zootec.
Luna-Palomera,Carlos; Ojeda-Robertos,Nadia Florencia; Peralta-Torres,Jorge Alonso; Macías-Cruz,Ulises; Sánchez-Dávila,Fernando; Segura-Correa,José Candelario.
ABSTRACT We evaluated the effect of some environmental factors on age at first lambing (AFL) and lambing to conception interval (LCI) of Pelibuey ewes under the humid tropical conditions of Mexico. Ewes grazed on Tanzania (Panicum maximum), Bermuda (Cynodon dactylon), and Brachiaria grass (Brachiaria humidicola) and received hay in the corral in the months of grass scarcity. Reproduction was continuous during the year. Data of 839 lambings from 334 ewes registered from 2009 to 2017 were analyzed using survival analysis procedures. The statistical model for AFL included the effects of year, season, and litter size at lambing, whereas that for LCI included year and season plus parity number of ewe and litter size at weaning. The overall means ± SD for AFL...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Age at first lambing; Lambing to conception interval; Parity number; Tropics; Survival analysis.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100600
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Extent and structure of genetic diversity in a collection of the tropical multipurpose shrub legume Cratylia argentea (Desv.) O. Kuntze as revealed by RAPD markers Electron. J. Biotechnol.
Andersson,Meike S; Schultze-Kraft,Rainer; Peters,Michael; Duque,Myriam C; Gallego,Gerardo.
The tropical multipurpose shrub legume Cratylia argentea is well adapted to acid soils of low to medium fertility and has excellent drought-tolerance. Due to its high nutritive value it is particularly suited as forage for dry-season supplementation. A collection of 47 C. argentea accessions in a collection, derived from seed replicating of original accessions with differing geographic origin and morphological and agronomic characteristics was investigated using molecular markers (RAPD (random amplified polymorphic DNA)). Genetic diversity (H T = 0.145) in the collection was low, with 30% of differentiation among groups and high genetic similarity among accessions (GS = 0.805). Within-accession variability was high. One taxonomic mismatch and five possible...
Tipo: Journal article Palavras-chave: Agroforestry; Molecular markers; MPT (multipurpose shrubs and trees); Tropics.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300006
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Forest Cover Changes in Tropical South and Central America from 1990 to 2005 and Related Carbon Emissions and Removals. Repositório Alice
EVA, H. D.; ACHARD, F.; BEUCHLE, R.; MIRANDA, E. E. de; CARBONI, S.; SELIGER, R.; VOLLMAR, M.; HOLLER, W. A.; OSHIRO, O. T.; ARROYO, V. B.; GALLEGO, J..
This paper outlines the methods and results for monitoring forest change and resulting carbon emissions for the 1990-2000 and 200-2005 periods carried out over tropical Central and South America. To produce our forest change estimates we used a systematic sample of medium resolution satellite data processed to forest change maps covering 1230 sites of 20 km by 20 km, each located at the degree confluence. Biomass data were spatially associated to each individual sample site so that annual carbon emissions could be estimated. For our study area we estimate that forest cover in the study area had fallen from 763 Mha (s.e. 10 Mha) in 1990 to 715 Mha (s.e. 10 Mha) in 2005. During the same period other wooded land (i.e., non-forest woody vegetation) had fallen...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Carbon emissions; Deforestation; Tropics; Remote sensing; Monitoring.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/924822
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Growth, biomass allocation and photosynthesis of Rolandra fruticosa (asteraceae) in response to shade Planta Daninha
Dias-Filho,Moacyr B.; Chagas Júnior,Aloisio F..
The effects of shade on growth, biomass allocation patterns and photosynthetic response was examined for Rolandra fruticosa (L.) Kuntze, a common perennial weed shrub in cultivated pastures and agricultural areas of Brazilian Amazonia, for plants grown in full sunlight and those shaded to 30 % of full sunlight over a 34-d period. Specific leaf area and leaf area ratio were higher for shade plants during all the experimental period. Shade plants allocated significantly less biomass to root tissue than sun plants and relative growth rate was higher in sun plants. Sun leaves had significantly higher dark respiration and light saturated rates of photosynthesis than shade leaves. The apparent quantum efficiency was higher for shade leaves, while light...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Specific leaf area; Leaf area ratio; Growth analysis; Tropics.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582000000100007
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Home gardens and Dioscorea species – A case study from the climatic zones of Sri Lanka JARTS
Sangakkara, Ravi; Frossard, Emmanuel.
Home gardens are considered as vital units for enhancing food security particularly in developing nations of South Asia, such as Sri Lanka. Although the yam crop Dioscorea spp. constitute a popular but still minor component in Sri Lankan home gardens, they have the potential of producing large quantities of edible material with minimal inputs. However, their real value in South Asian home gardens is not yet reported. Hence, this study was carried out to get insights into home garden characteristics, gardener demography as well as current management practices within 300 Sri Lankan home garden systems that are located along a climatic gradient. By using interviews and field observations, gardeners, who cultivated in particular Dioscorea species, were studied...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agroecology; Agronomy and Crop Science food security; Productivity; Smallholder farming; South Asia; Tropics; Yams; Dioscorea.
Ano: 2014 URL: http://www.jarts.info/index.php/jarts/article/view/2014020344898
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Improving some management practices to increase hybrid rice seed yield in the tropics International Rice Research Institute
Truong, Quoc Can.
xxii, 139 leaves : ill. Thesis (M.S.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Hybrids; Plant cultural practices; Seed productivity; Tropics.
Ano: 2003 URL: http://hdl.handle.net/123456789/400
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Interaction and fluctuation of arthropod species in a tropical rice ecosystem International Rice Research Institute
Luo, Lizhi.
181 l. : ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Arthropods; Rice; Ecosystems; Tropics.
Ano: 1989 URL: http://hdl.handle.net/123456789/1128
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Length-weight relationship and condition factor of Micropogonias furnieri (Desmarest) (Perciformes, Sciaenidae) in the Sepetiba Bay, Rio de Janeiro State, Brazil Zoologia
Costa,Marcus Rodrigues da; Araújo,Francisco Gerson.
The length-weight relationship and spatial, temporal and ontogenetic changes in the condition factor of Micropogonias furnieri (Desmarest, 1823) were analyzed, from samples collected between October 1998 and September 1999, in the Sepetiba Bay, a coastal area with a wide communication with the sea (22º54'-23º04'S, 43º34'-44º10'W) at Southeast Brazil. The aim was to supply basic information on the form of growth of the population of M. furnieri that uses the bay, as well as to assess changes in the fish condition. Most fish were young and subadults. The length-weight equation, based on 2499 unsexed individuals, was Wt = 0.009095 * Lt2.99, where Wt is the total weight (g) and Lt is the total length (cm). The regression constant and the regression coefficient...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coastal fish; Fish occurence; Ichthyofauna; Tropics; White croaker.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000400022
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Métodos para avaliação do uso sustentável dos recursos solo e água nos trópicos. Infoteca-e
LAL, R..
bitstream/item/202184/1/CNPMA-DOC.-03-99-11178.pdf
Tipo: Documentos (INFOTECA-E) Palavras-chave: Solos; Recursos sustentaveis; Metodos para avaliacao; Tropicos; Soils; Sustainable resources; Evaluation methods; Água; Tropics; Water.
Ano: 1999 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/932356
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Morpho-physiological traits for high-yielding wet season rice in the Tropics International Rice Research Institute
Laza, Ma. Rebecca C..
iv, 151 l. : ill. Thesis (Ph.D.) -- University of Tokyo
Tipo: Thesis Palavras-chave: Rice; Plant morphology; Plant physiology; Agronomic traits; Varieties; Wet season; Tropics.
Ano: 2003 URL: http://hdl.handle.net/123456789/407
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On Munduruku, a new Theraphosid genus from Oriental Amazonia (Araneae, Mygalomorphae) Iheringia, Sér. Zool.
Miglio,Laura T.; Bonaldo,Alexandre B.; Pérez-Miles,Fernando.
Munduruku gen. nov. is proposed for the type species Munduruku bicoloratum sp. nov., from Juruti and Santarém, Pará, Brazil. The main diagnostic character of Munduruku gen. nov. is the presence of a subapical, lanceolate keel on the male palpal bulb, which is unique among the basal taxa of Theraphosinae with type III-IV urticating setae. The female spermathecae consist of two spheroid receptacles with funnel-shaped necks, each of which bears a sclerotized area. In both sexes, the abdomen is remarkably patterned, an uncommon feature in adults of New World theraphosids. Both the bulbus lanceolate keel and the abdominal color pattern are hypothesized as synapomorphies of the genus.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Neotropics; Tropics; Systematics; Taxonomy; Spiders.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212013000200013
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Overcoming Information Limitations for the Prescription of an Environmental Flow Regime for a Central American River Ecology and Society
Esselman, Peter C; Department of Fisheries and Wildlife, Michigan State University; pce@msu.edu; Opperman, Jeffrey J; The Nature Conservancy; jopperman@tnc.org.
Tipo: Peer-Reviewed Reports Palavras-chave: Dams; Environmental flows; Fish assemblage; Honduras; Hydrology; Traditional ecological knowledge; Tropics.
Ano: 2010
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Phytoplankton composition and functional groups in a tropical humic coastal lagoon, Brazil Acta Botanica
Alves-de-Souza,Catharina; Menezes,Mariângela; Huszar,Vera.
This paper presents the composition and functional groups of the phytoplankton from Comprida lagoon, a tropical humic coastal Lagoon located in Southeast Brazil. A total of 28 taxa was found, distributed in eight taxonomic divisions as follows: 26% Heterokontophyta, 21% Chlorophyta, 21% Cyanophyta, 14% Bacillariophyta, 14% Cryptophyta, and 4% Prymnesiophyta. Twenty-three taxa were identified at the specific and infraspecific levels, from which four are new records for Brazil and two for Rio de Janeiro State. Phytoplankton of the Comprida lagoon was comprised of several flagellates, but also eukaryote and prokaryote picoplankton, filamentous cyanobacteria and several diatoms. The biomass was lower than that found in other lacustrine systems, and showed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phytoplankton; Tropics; Humic systems; Coastal lagoons; Functional groups; Southeast Brazil.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062006000300019
Registros recuperados: 34
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