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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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Climates, soils, and agriculture in the tropical region. Repositório Alice
SPADOTTO, C. A.; MINGOTI, R..
ABSTRACT: The tropical region can be geographically defined, using latitudinal delimitation, as that part of the earth located between the Tropic of Cancer and the Tropic of Capricorn, comprising 38% of the Earth?s land surface. A total of 124 countries and territories are entirely or for the most part in the tropical region. On the other hand, the boundaries of the tropics are defined by climatologists commonly based on surface temperature and precipitation patterns. Hence, the estimated boundaries of the tropics can extend further from the equator than the latitudinal delimitation and the tropical zone spreads across the less well- defined subtropical zone. In this chapter, descriptions of the main climates and soils and a summary of the agricultural...
Tipo: Parte de livro Palavras-chave: Meteorological conditions; Trópicos; Ambiente; Propriedades do solo; Condições meteorológicas; Mudança do clima; Tropics; Environment; Soil properties; Climate change.
Ano: 2023 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1154686
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Climates, soils, and agriculture in the tropical region. Repositório Alice
SPADOTTO, C. A.; MINGOTI, R..
ABSTRACT: The tropical region can be geographically defined, using latitudinal delimitation, as that part of the earth located between the Tropic of Cancer and the Tropic of Capricorn, comprising 38% of the Earth?s land surface. A total of 124 countries and territories are entirely or for the most part in the tropical region. On the other hand, the boundaries of the tropics are defined by climatologists commonly based on surface temperature and precipitation patterns. Hence, the estimated boundaries of the tropics can extend further from the equator than the latitudinal delimitation and the tropical zone spreads across the less welldefined subtropical zone. In this chapter, descriptions of the main climates and soils and a summary of the agricultural...
Tipo: Parte de livro Palavras-chave: Trópicos; Região tropical; Ambiente; Propriedades do solo; Solos; Condições meteorológicas; Mudança do clima; Soils; Meteorological conditions; Agricultura; Agriculture; Tropical agriculture; Tropics; Environment; Soil properties; Climate change.
Ano: 2023 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1154854
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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: 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
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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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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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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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Meridional shifts in the marine ITCZ and the tropical hydrologic cycle over the last three glacial cycles ArchiMer
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
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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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Novas abordagens, tendências e oportunidades no uso de modelos de simulação para a avaliação de sistemas agrícolas em regiões tropicais. Repositório Alice
BORTOLON, E. S. O.; BORTOLON, L.; LEITE, L. F. C.; LUCHIARI JUNIOR, A..
A modelagem de agroecossistemas pode contribuir na definição de programas de pesquisa em regiões tropicais e subtropicais, antecipando o processo de obtenção de resultados de pesquisa e auxiliar na tomada de decisão, potencializando o desenvolvimento regional e reduzindo os impactos negativos das atividades agropecuárias nas mudanças climáticas globais. Assim, este trabalho tem como propósito o de apresentar uma revisão bibliográfica sobre esse tema analisando as principais tendências e oportunidades de pesquisa em regiões tropicais relacionadas com o uso de modelos de simulação como ferramentas para a avaliação de sistemas de produção agropecuária.
Tipo: Artigo de periódico Palavras-chave: Modelo de Simulação; Ecossistema; Sistema de Cultivo; Integrated agricultural systems; Agroecosystems; Subtropics; Tropics.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1120079
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Observed tracer fields structuration by mid-depth zonal jets in the tropical Pacific ArchiMer
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
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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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Palaeoenvironmental change in tropical Australasia over the last 30,000 years - a synthesis by the OZ-INTIMATE group ArchiMer
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
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Pesticide contamination of groundwater in the tropical region. Repositório Alice
DORES, E. F. G. DE C.; SPADOTTO, C. A.; MINGOTI, R..
ABSTRACT: Pesticides residues have been detected in groundwater all around the world, but most published studies were carried out in temperate climate countries despite the intensive use of these substances in tropical agricultural areas. A review regarding pesticides in groundwater in tropical regions up to 2020 is presented based on Scopus®, Web of Science®, and Google Scholar® where the earliest study found dated 1998. Very few papers related the hydrogeological conditions to pesticides occurrence although the detection of a great variety of molecules (persistent and nonpersistent) have been reported, even ones not classified as leachable. Moreover, no temporal variations were discussed since many of the described studies reported results from very few...
Tipo: Parte de livro Palavras-chave: Trópicos; Agricultura; Meio Ambiente; Lixiviação; Água Potável; Tropics; Agriculture; Environment; Leaching; Drinking water.
Ano: 2023 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1154687
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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
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