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| Registros recuperados: 38 | |
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| Ollitrault, Michel; Gabillet, Céline; De Verdiere, Alain Colin. |
| As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D-2 and D-4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a... |
| Tipo: Text |
Palavras-chave: Taylor dispersion; Dispersion; Atlantic circulation; Particule pairs. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-456.pdf |
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| Bulla,Cíntia Karen; Gomes,Luiz Carlos; Miranda,Leandro Esteban; Agostinho,Angelo Antonio. |
| We describe the fish assemblages associated with drifting macrophyte mats and consider their possible role as dispersal vectors in the Ivinhema River, a major tributary of the upper Paraná River, Brazil. Fish associated with drifting mats were sampled in the main river channel during January and March 2005, when the wind and/or the increased water level were sufficient to transport macrophyte stands. Fish in the drifting mats were sampled with a floating sieve (4 m long x 2 m wide x 0.6 m high, and 2 mm mesh size). In the laboratory, larvae, juvenile, and adult fish were counted and identified to the lowest possible taxonomic level. In four drifting macrophyte mats we captured 218 individuals belonging to at least 28 species, 17 families, and 6 orders.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dispersion; Fish guilds; Floodplain; Free-floating plants; Freshwater fishes. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200018 |
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| Bermúdez Acosta, Jelvys; González Delgado, Alejandro; Castro Hernández, Yoelvis; Ortiz Guilarte, Eudalys; Núñez Moreira, Roberto; Oramas García, Julio; García García, Yaliany. |
| El propósito de esta investigación fue estudiar la contaminación de un ecosistema de manglar impactado con hidrocarburos en el sector centro sur de Cayo Santa María, Jardines del Rey, Cuba. Para el estudio de los indicadores microbiológicos y fisicoquímicos fue diseñado un muestreo estratificado, donde se seleccionaron dos estratos y diez estaciones de muestreo, considerando los patrones de flujos de marea en pleamar y bajamar, así como el impacto perceptible de la contaminación. La determinación de las poblaciones de microorganismos heterótrofos totales (BHT) y degradadores de petróleo (BDP) en agua y sedimentos se realizó por el método de conteo de colonias, expresadas como UFC·mL-1 o UFC· g-1 según la matriz de análisis. El contenido de hidrocarburos... |
| Tipo: Journal Contribution |
Palavras-chave: ASW; Cuba; Degradation; Dispersion; Hydrocarbons; Microorganisms; Pollution. |
| Ano: 2014 |
URL: http://hdl.handle.net/1834/5912 |
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| HOELTGEBAUM,MARCIA P.; MONTAGNA,TIAGO; LANDO,ANA PAULA; PUTTKAMMER,CATARINA; ORTH,AFONSO INÁCIO; GUERRA,MIGUEL P.; REIS,MAURÍCIO S. DOS. |
| ABSTRACT Varronia curassavica, a subshrubby medicinal species associated with restinga in the Atlantic Forest, has been exploited by local people and the pharmaceutical industry. Indeed, restingas have experienced a continuous process of degradation, and thus, with species and ecosystem both at risk, efforts to support conservation actions are required. The present study aimed to evaluate aspects of V. curassavica reproductive biology. To accomplish this, morphological characterization was performed by monitoring flowering events. The availability of nectar and pollen, as well as the frequency and behavior of floral visitors and dispersers, was also evaluated. This species exhibits both heterostyly and protogyny. Anthesis is diurnal, and flowers last less... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dispersion; Heterostyly; Pollination; Floral resources. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100059 |
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| WEBER,ANDERSON C.; DEGRANDE,PAULO E.; SOUZA,ELLEN P. DE; AZAMBUJA,ROSALIA; FERNANDES,MARCOS G.. |
| Abstract Recently, the Neotropical brown stink bug, Euschistus heros (Pentatomidae: Hemiptera), has been detected in cotton in the Brazilian Cerrado. Several reliable surveys have been conducted on the spatial distribution of stink bugs in soybean; however, few studies have examined the behavior of this insect in cotton in Brazil. Thus, this study examined the spatial distribution of E. heros in cotton using aggregation indices based on the variance-to-mean ratio, Morisita index, exponent k, Poisson and negative binomial distributions. Inverse Distance Weighting interpolation maps were also used to represent insect density. The study was conducted in a 1.1 hectare experimental cotton field in which 64 equally-sized plots were sampled on a weekly basis. Our... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aggregation Indices; Dispersion; GIS; IPM; Negative Binomial. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703483 |
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| Flechtmann,Carlos A.H.; Ottati,Angelo L.T.. |
| We report for the first time the attack of the walking stick Tetanorhynchus leonardosi (Mello-Leitão) (Orthoptera: Proscopiidae) on young eucalyptus, Eucalyptus urophylla, in Brazil. The upper third of the trees was attacked (apical meristems and new leaves). During the hottest hours of the day the insects were found sheltered between leaves on the median third of the plants, and feeding when temperatures were milder. The attack was heterogeneous in the stand, being more concentrated when it was neighbouring an area of native 'Cerrado' vegetation. Mean defoliation was 5.8%, with an average of 5.2% of plants with apical meristems cut by the walking sticks. An application of Methyl Parathion was not effective against the pest. Apparently plants older than 6... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Damage; Dispersion; Walking stick. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591997000300027 |
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| Cestari,César; Pizo,Marco Aurélio. |
| Manakins (Pipridae) are one of the most abundant fruit-eaters and seed dispersers in the understory of neotropical forests. We describe the fruit diet of the White-beaded Manakin (Manacus manacus) based on a two-year study of its foraging behavior on fruiting plants, collecting seeds from feces and regurgitations of trapped individuals, and from lekking males' courts in restinga forests at the southern coast of the state of São Paulo, Brazil. Manacus manacus consumed 58 species of fruits from 30 different plant families. Fruits were taken at 3.5 ± 1.9 m height and 1.5 ± 1.6 m below the forest canopy using mainly sally-strike and glean manoeuvres. Most of the fruits were berries ranging from 3.1 to 17 mm in diameter and containing from 1 to 86 seeds. Fruits... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Dispersion; Fruits; Animal-plant interaction; Seeds. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000200345 |
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| Varotto,Ricardo Silva; Barreto,Cristine Costa. |
| The colonization pattern of wooden panels by teredinid larvae released from a previously infested focus was investigated. Panels were placed at different distances (1, 10, 20m) and in different directions from the focus. The colonization experiment took place at Parcel do Aleijado, Ilha Grande Bay, RJ. The focus remained immersed in nearly surface water, by the coast, during three months for infestation by teredinids. After this period, it was transferred to the study site. The infested focus and colonization panels remained in water, 10m deep, for three months more. Total density and density of the dominant species were considered for each group of panels. Five teredinid species were found: Bankia fimbriatula, Bankia gouldi, Lyrodus floridanus, Lyrodus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Teredinidae; Colonization; Benthic ecology; Dispersion. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000400002 |
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| Pazini,Juliano de Bastos; Botta,Robson Antonio; Seidel,Enio Júnior; Silva,Fernando Felisberto da; Martins,José Francisco da Silva; Barrigossi,José Alexandre Freitas; Rübenich,Rodrigo. |
| Tibraca limbativentris (rice stem bug) is an insect highly injurious to the rice crop in Brazil. The aim of this research was to define the spatial distribution of the T. limbativentris and improve the sampling process by means of geostatistical application techniques and construction of prediction maps in a flooded rice field located in the "Planalto da Campanha" Region, Rio Grande do Sul (RS), Brazil. The experiments were conducted in rice crop in the municipality of Itaqui - RS, in the crop years of 2009/10, 2010/11 and 2011/12, counting fortnightly the number of nymphs and adults in a georeferenced grid with points spaced at 50m in the first year and in 10m in the another years. It was performed a geostatistical analysis by means adjusting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Rice stem bug; Dispersion; Monitoring. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000601006 |
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| Registros recuperados: 38 | |
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