Consulta: subjectFacets:"Tropics"
Registros recuperados: 26
Data/hora: 03/06/2024 03:33:33

Overcoming Information Limitations for the Prescription of an Environmental Flow Regime for a Central American River
Provedor de dados: Ecology and Society
Autores: 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

Total Historical Land-Use Change in Eastern Bolivia: Who, Where, When, and How Much?
Provedor de dados: Ecology and Society
Autores: Killeen, Timothy J; Conservation International; t.killeen@conservation.org; Guerra, Anna; Museo Noel Kempff Mercado; aguerra@museonoelkempff.org; Calzada, Miki; Museo Noel Kempff Mercado; mcalzada@museonoelkempff.org; Correa, Lisette; Museo Noel Kempff Mercado; lcorrea@museonoelkempff.org; Calderon, Veronica; Museo Noel Kempff Mercado; vcalderon@museonoelkempff.org; Soria, Liliana; Museo Noel Kempff Mercado; lsoria@museonoelkempff.org; Quezada, Belem; Museo Noel Kempff Mercado; bquezada@museonoelkempff.org; Steininger, Marc K; Conservation International; m.steininger@conservation.org.
Tipo: Peer-Reviewed Reports
Palavras-chave: Deforestation; Drivers; Land-cover change; Markets; Migration; Social sectors; Tropics.
Ano: 2008

Can Logging in Equatorial Africa Affect Adjacent Parks?
Provedor de dados: Ecology and Society
Autores: 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

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
Provedor de dados: Electronic Journal of Biotechnology
Autores: 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

On Munduruku, a new Theraphosid genus from Oriental Amazonia (Araneae, Mygalomorphae)
Provedor de dados: Iheringia Série Zoologia
Autores: 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

Métodos para avaliação do uso sustentável dos recursos solo e água nos trópicos.
Provedor de dados: Informação Tecnológica em Agricultura (Infoteca-e)
Autores: 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

SKIM, a Candidate Satellite Mission Exploring Global Ocean Currents and Waves
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ardhuin, Fabrice; Brandt, Peter; Gaultier, Lucile; Donlon, Craig; Battaglia, Alessandro; Boy, François; Casal, Tania; Chapron, Bertrand; Collard, Fabrice; Cravatte, Sophie; Delouis, Jean Marc; De Witte, Erik; Dibarboure, Gerald; Engen, Geir; Johnsen, Harald; Lique, Camille; Lopez-dekker, Paco; Maes, Christophe; Martin, Adrien; Marié, Louis; Menemenlis, Dimitris; Nouguier, Frederic; Peureux, Charles; Rampal, Pierre; Ressler, Gerhard; Rio, Marie-helene; Rommen, Bjorn; Shutler, Jamie D.; Suess, Martin; Tsamados, Michel; Ubelmann, Clement; Van Sebille, Erik; Van Den Oever, Martin; Stammer, Detlef.
The Sea surface KInematics Multiscale monitoring (SKIM) satellite mission is designed to explore ocean surface current and waves. This includes tropical currents, notably the poorly known patterns of divergence and their impact on the ocean heat budget, and monitoring of the emerging Arctic up to 82.5°N. SKIM will also make unprecedented direct measurements of strong currents, from boundary currents to the Antarctic circumpolar current, and their interaction with ocean waves with expected impacts on air-sea fluxes and extreme waves. For the first time, SKIM will directly measure the ocean surface current vector from space. The main instrument on SKIM is a Ka-band conically scanning, multi-beam Doppler radar altimeter/wave scatterometer that includes a...
Tipo: Text
Palavras-chave: Ocean current; Tropics; Arctic; Doppler; Altimetry; Sea state; Remote sensing; Ocean waves.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00498/60964/64372.pdf

Palaeoenvironmental change in tropical Australasia over the last 30,000 years - a synthesis by the OZ-INTIMATE group
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Reeves, Jessica M.; Bostock, Helen C.; Ayliffe, Linda K.; Barrows, Timothy T.; De Deckker, Patrick; Devriendt, Laurent S.; Dunbar, Gavin B.; Drysdale, Russell N.; Fitzsimmons, Kathryn E.; Gagan, Michael K.; Griffiths, Michael L.; Haberle, Simon G.; Jansen, John D.; Krause, Claire; Lewis, Stephen; Mcgregor, Helen V.; Mooney, Scott D.; Moss, Patrick; Nanson, Gerald C.; Purcell, Anthony; Van Der Kaars, Sander.
The tropics are the major source of heat and moisture for the Australasian region. Determining the tropics' response over time to changes in climate forcing mechanisms, such as summer insolation, and the effects of relative sea level on exposed continental shelves during the Last Glacial period, is an ongoing process of re-evaluation. We present a synthesis of climate proxy data from tropical Australasia spanning the last 30,000 years that incorporates deep sea core, coral, speleothem, pollen, charcoal and terrestrial sedimentary records. Today, seasonal variability is governed largely by the annual migration of the inter-tropical convergence zone (ITCZ), influencing this region most strongly during the austral summer. However, the position of the ITCZ has...
Tipo: Text
Palavras-chave: ITCZ; LGM; INTIMATE; Australasia; Indo-Pacific Warm Pool; Tropics; Australian monsoon.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00264/37502/36909.pdf

Meridional shifts in the marine ITCZ and the tropical hydrologic cycle over the last three glacial cycles
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Schmidt, Matthew W.; Spero, Howard J.
Paleoproxy studies show a strong correlation between tropical climate and high-latitude temperature variability recorded in the Greenland ice cores over the last glacial cycle. In particular, abrupt cooling events in the Greenland Ice Sheet Project II delta(18)O ice record appear synchronous with a southward migration of the Intertropical Convergence Zone (ITCZ) in the Atlantic, a weakening of the Indian and East Asian monsoon systems, and a strengthening of the South American monsoon system. Because this high-to-low-latitude climate teleconnection significantly alters the tropical hydrologic cycle around the globe, it plays a critical role in regulating global climate on glacial-interglacial time scales. We compare delta(18)O(seawater) reconstructions (a...
Tipo: Text
Palavras-chave: Hydrologic cycle; Mg/Ca; Quaternary; Tropics; Salinity; ITCZ.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00228/33877/32255.pdf

Observed tracer fields structuration by mid-depth zonal jets in the tropical Pacific
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Delpech, Audrey; Cravatte, Sophie; Marin, Frederic; Morel, Yves; Gronchi, Enzo; Kestenare, Elodie.
The mid-depth ocean circulation in the tropical Pacific is dominated by sets of alternating eastward and westward jets. The origin and transport properties of these flow features remain in many ways an open question, all the more crucial since their usual underestimation in ocean global circulation model has been identified as a potential bias for the misrepresentation of the oxygen minimum zones. In this study, we analyze the water mass properties associated with these systems of jets using velocity and hydrographic sections. Data acquired during a dedicated cruise carried out in the western part of the basin and supplemented by cross-equatorial sections from historical cruises in the central and eastern parts are analyzed. While it is confirmed that the...
Tipo: Text
Palavras-chave: Pacific Ocean; Tropics; Jets.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00593/70490/68635.pdf

Seasonal Variations in the Histometric Characteristics of the Reproductive Organs of Pubertal West African Dwarf Bucks in their Native Tropical Environment
Provedor de dados: International Journal of Morphology
Autores: Bitto,I.I; Egbunike,G. N; Akusu,M. O.
As ambient temperature and humidity are high all year round within clearly defined dry and rainy seasons in our humid tropical environment, we evaluated the effects of season on the histometric characteristics of the reproductive organs of pubertal West African dwarf bucks using 8 healthy animals. There were no significant differences (p&gt;0.05) between the rainy and dry seasons in the basement membrane of the testes, seminiferous tubular diameter, and round spermatid nuclear diameter. There were also similarities (p&gt;0.05) between the seasons in epididymal luminal diameters, epididymal epithelial heights as well as in Leydig/sertoli cell ratio and sertoli cell Índex. Quadratic regression analyses showed that all the histometric characteristics of the...
Tipo: Journal article
Palavras-chave: Goats; Testes; Histometric; Seasons; Tropics; Farmers.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000200024

Terrestrial and coastal landscape evolution on tropical oceanic islands
Provedor de dados: Naturalis Digital Academic Repository
Autores: Viles, H.A.; Spencer, T.
Tropical oceanic islands owe their origin to volcanic eruptions, their location to plate tectonics, and their morphology to the interplay over time between a range of constructional and erosional processes. A broad distinction can be made between high volcanic islands, with summits up to 4,000 m, and low carbonate islands only a few metres above sea level.
Tipo: Article / Letter to the editor
Palavras-chave: Island; Evolution; Landscape evolution; Tropics; Volcanic islands; Carbonate islands; 38.37; 38.09.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/428046

The first record of the boreal bog species Drosera rotundifolia (Droseraceae) from the Philippines, and a key to the Philippine sundews
Provedor de dados: Naturalis Digital Academic Repository
Autores: Coritico, F.P.; Fleischmann, A.
Drosera rotundifolia, a species of the temperate Northern Hemisphere with a disjunct occurrence in high montane West Papua, has been discovered in a highland peat bog on Mt Limbawon, Pantaron Range, Bukidnon on the island of Mindanao, Philippines, which mediates to the only other known tropical, Southern Hemisphere location in New Guinea and the closest known northern populations in southern Japan and south-eastern China. A dichotomous key to the seven Drosera species of the Philippines is given, and distribution maps are provided.
Tipo: Article / Letter to the editor
Palavras-chave: Carnivorous plants; Drosera; Droseraceae; Malesia; Mindanao; Northern Hemisphere; Tropics; Disjunction; Philippines; 42.58; 42.48.
Ano: 2016
URL: http://www.repository.naturalis.nl/record/606354

尿素処理稲わらの利用における糖蜜の効果
Provedor de dados: Obihiro University of Agriculture and Veterinary Medicine Academic Repository (OAK)
Autores: Nakanishi, Masaaki; Perera, Nimal; Okamoto, Meiji; Yoshida, Norihito; 中西, 雅昭; ペレラ, N. F.; 岡本, 明治; 吉田, 則人.
Palavras-chave: Rice Straw; Urea Treatment; Molasses; Digestibility; Tropics.
Ano: 1992
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1686

Growth, biomass allocation and photosynthesis of Rolandra fruticosa (asteraceae) in response to shade
Provedor de dados: Planta Daninha
Autores: 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

The biology and culture of tropical oysters
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Angell,   C.L.
Reviews the biology and ecology of oysters, and experimental and culture techniques used in the tropics; describes problems in tropical oyster farming and identifies research needs to further develop this form of aquaculture. Three oyster genera are discussed: Ostrea, Crassostrea and Saccostrea. The advantages and disadvantages of various species of each genus with regard to aquaculture are also described.
Tipo: Report
Palavras-chave: Oyster culture; Tropics; Biology; Farm Management.
Ano: 1986
URL: http://purl.umn.edu/44687

Research and education for the development of integrated crop-livestock-fish farming systems in the tropics.
Provedor de dados: Research in Agricultural & Applied Economics (AgEcon Searh)
Autores: Edwards,   Peter; Pullin,   Roger S.V.; Gartner,   J.A.
There is a vast potential for Asia's numerous and needy small-scale farmers to enjoy the benefits of integration of aquaculture into farming systems. This publication attempts to create a framework for an interdisciplinary approach to research and education in integrated farming - a fusion of agriculture and aquaculture sciences.
Tipo: Report
Palavras-chave: Integrated farming; Research; Education; Tropics; Farm Management.
Ano: 1988
URL: http://purl.umn.edu/44685

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)
Provedor de dados: Revista Brasileira de Botânica
Autores: 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

Comunidade de formigas que nidificam em pequenos galhos da serrapilheira em floresta da Amazônia Central, Brasil
Provedor de dados: Revista Brasileira de Entomologia
Autores: 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

Pineapple yield and fruit quality effected by NPK fertilization in a tropical soil
Provedor de dados: Revista Brasileira de Fruticultura
Autores: Spironello,Ademar; Quaggio,José Antonio; Teixeira,Luiz Antonio Junqueira; Furlani,Pedro Roberto; Sigrist,José Maria Monteiro.
There is a lack of information about fertilization of pineapple grown in the State of São Paulo, Brazil. So a field experiment with pineapple 'Smooth Cayenne' was carried out to study the effects of NPK rates on yield and fruit quality. The trial was located on an Alfisol in the central part of the State of São Paulo (Agudos county). The experimental design was an incomplete NPK factorial, with 32 treatments set up in two blocks. The P was applied only at planting, at the rates of 0; 80; 160 and 320 kg/ha of P2 0(5), as superphosphate. The N and K2O rates were 0; 175; 350, and 700 kg/ha, applied as urea and potassium chloride, respectively, divided in four applications during the growth period. Response functions were adjusted to yield or to fruit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ananas comosus (L.) Merrill; Mineral nutrition; Growth; Soil fertility; Tropics.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000100041

Evaluation of some reproductive traits of Pelibuey ewes under humid tropical conditions of Mexico
Provedor de dados: Revista Brasileira de Zootecnia
Autores: 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

Length-weight relationship and condition factor of Micropogonias furnieri (Desmarest) (Perciformes, Sciaenidae) in the Sepetiba Bay, Rio de Janeiro State, Brazil
Provedor de dados: Zoologia
Autores: 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

Size distribution of the jack Chloroscombrus chrysurus (Linnaeus) (Actinopterygii, Carangidae) in a tropical bay at Southeastern Brazil
Provedor de dados: Zoologia
Autores: Costa,Marcus R. da; Albieri,Rafael J.; Araújo,Francisco G.
Chloroscombrus chrysurus (Linnaeus, 1766) is the most abundant representant of the Carangidae family in the Sepetiba bay, a c.a. 450 km² semi-closed coastal area in the Southeastern Brazil. We analyze fish (number, weight and size) and environmental data to assess the part of life history of this species in tropical embayment environments. Fish sampling were taken in triplicates by monthly bottom trawls, in three bay zones (inner, middle and outer), defined according to a spatial gradient of depth and salinity. Juveniles were firstly caught in the inner bay zone measuring 30-90 mm total length - TL (mode = 60 mm TL) in Spring. Then they move toward the middle and outermost part of the bay in Summer-Autumn (120-180 mm TL), following a seaward migration to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal fishes; Estuaries; Growth; Tropics.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000300009

Environmental determinants for natural regeneration of gallery forest at the Cerrado/Amazonia boundaries in Brazil
Provedor de dados: Acta Amazonica
Autores: 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&lt;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

EFFECTS OF FUNGICIDES ON ENDOPHYTIC FUNGI AND PHOTOSYNTHESIS IN SEEDLINGS OF A TROPICAL TREE, Guarea guidonia (Meliaceae)
Provedor de dados: Acta Biológica Colombiana
Autores: 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: Info:eu-repo/semantics/article
Palavras-chave: Endophytes; Tropics; Photosynthesis; Fungicides; Guarea.
Ano: 2005
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2005000200003

Phytoplankton composition and functional groups in a tropical humic coastal lagoon, Brazil
Provedor de dados: Acta Botanica Brasilica
Autores: 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