|
|
|
| Registros recuperados: 113 | |
|
| |
|
| |
|
| |
|
| |
|
|
| Fernandes, Flávio Lemes; Fernandes, Maria Elisa de Sena; Lopes, Elisângela Novais; Venzon, Madelaine; Diniz, Juno Ferreira da Silva; Dias, Luis Antônio dos Santos. |
| Jatropha curcas has a high biofuel oil content, which could replace polluting fuels, and has great potential for large scale monoculture cultivation in the conventional system. We explored the occurrence, spatial distribution and the functional response of the main phytophagous species of this plant and their natural enemies to explore the potential for conservative biological control. We began sampling phytophagous species and predators when J. curcas plants were six months old. The most common species of phytophagous insects were nymphs and adults of Empoasca kraemeri, followed by Frankliniella schultzei and Myzus persicae. Among the predators, Ricoseius loxocheles, Iphiseioides zuluagai, Araneidae, larvae and adults of Psyllobora vigintimaculata and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Predators; Parasitoids; Phytophagy; Spatial distribution; Functional response Entomologia Agrícola. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17562 |
| |
|
|
| Genú, Aline Marques; Universidade Estadual do Centro-Oeste; Roberts, Dar; University of California; Demattê, José Alexandre Melo; Universidade de São Paulo. |
| Systematic, physically based acquisition of information regarding soils is required to meet increasing demand in agricultural and environmental systems. The objective of this work is to evaluate the use of multiple endmember spectral mixture analysis (MESMA) for mapping soil attributes within ASTER imagery. A total of 184 georeferenced soil samples were collected from Rafard, São Paulo State, Brazil. These points were overlain on the satellite image to collect spectral data. The laboratory and image information were then arranged and prepared by clustering samples into classes based on the following soil attributes: texture, organic matter, base saturation (V%), CEC and total iron. Following this classification, mean spectral curves were generated for... |
|
Palavras-chave: Agronomia; Ciência do Solo remote sensing; Spatial distribution; Geostatistics. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/16119 |
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Silva,Mauro T. B.; Neto,Nelson; Hoffmann-Campo,Clara B.. |
| Soybean [(Glycine max (L.) Merrill] commercial fields, maintained under a no-till system, were sampled during the crop seasons 1990/91 and 1996/97, in Cruz Alta and Júlio de Castilhos, Rio Grande do Sul State, to determine the distribution of eggs, larvae and adults of Sternechus subsignatus Boheman (Coleoptera : Curculionidae). Soybean plants and soil were examined at different time schedules. Eggs and larvae were recorded in main stems, lateral branches and leaf petioles, divided into the upper third, medium and lower third of soybean plants. Eggs (87%), and larvae (79%) were mainly observed in the main stem and in the medium plant sections (87% and 78%, respectively). Larval movement was not observed because larvae remained inside the galls, in the same... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Curculionidae; Ecology; Behavior; Spatial distribution. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591998000400002 |
| |
|
|
| Calaça,Analice; Fachi,Marluci; Silva,Diego Afonso; Oliveira,Seixas Rezende; Melo,Fabiano Rodrigues de. |
| Abstract: Habitat fragmentation is one of the principal causes of the decline of species worldwide, and the Brazilian Atlantic Forest and Cerrado savanna biomes are among the most severely affected by this process. While highly fragmented, remnants of Atlantic Forest can still be found within the Cerrado domain of southern Goiás, where previous studies have revealed high levels of biodiversity. To inventory the mammalian species that occur in the region, two fragments of semideciduous Atlantic Forest were sampled between 2011 and 2016, using line transect surveys and camera trapping. A total of 1016 records were obtained of 30 mammal species, of which eleven are under some threat of extinction. The species richness recorded on this study was similar to or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Survey; Cameras traps; Linear transect; Medium- and large-sized mammals; Spatial distribution; Species richness. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000100301 |
| |
|
| |
|
|
| Henriques-Oliveira,Ana Lucia; Nessimian,Jorge Luiz. |
| Aquatic macroinvertebrate diversity and composition in streams along an altitudinal gradient in Southeastern Brazil. A study concerning taxonomic richness and composition of the aquatic insect fauna in streams within the same catchment basin along an altitudinal gradient in Southeast Brazil, was conducted to test the hypothesis that there is a faunal discontinuity in the biocenotic composition, related to differences in altitude and latitude. In Southeastern Brazil, around latitude 22°, this faunal transition from rhithron to potamon biocenosis should occur at 500 m above sea level. Eighteen tributaries of the Mambucaba River, at Serra da Bocaina National Park, SP-RJ, Brazil, were studied. The streams were separated into 6 altitudinal zones (zone 1: above... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Altitudinal distribution; Spatial distribution; Taxonomic richness; Benthic macroinvertebrates. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000300012 |
| |
|
| |
|
| |
|
| |
|
|
| Bonnin,Juan José; Mirás-Avalos,José Manuel; Lanças,Kléber Pereira; González,Antonio Paz; Vieira,Sidney Rosa. |
| The aim of this work was to analyze the spatial distribution of soil compaction and the influence of soil water content on the resistance to penetration. The latter variable was described by the cone index. The soil at the study site was a Nitisol and the cone index data were obtained using a penetrometer. Soil resistance was assessed at 5 different depths, i.e. 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and deeper than 40 cm, whereas soil water content was measured at 0-20 cm and 20-40 cm. Soil water conditions varied during the different samplings. Coefficients of variation for cone index ranged from 16.5% to 45.8% while those for soil water content varied from 8.96% to 21.38%. Results suggested a high correlation between soil resistance, as assessed by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cone index; Indicator kriging; Soil compaction; Spatial distribution. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500017 |
| |
|
| |
|
| |
| Registros recuperados: 113 | |
|
|
|
