Resultados de búsqueda - "ecology"

Relevance and limitations of biogenic and physicogenic classification: a comparison of approaches for differentiating the origin of soil aggregates por Jouquet, Pascal, Zangerle, A., Rumpel, C., Brunet, D., Bottinelli, N., Tran Duc Toan

“…The NIRS characteristics of BIO were also more uniform than those of PHYS, suggesting that BIO aggregates have a simpler organization and as a consequence more homogeneous ecological functions. Thus, our findings suggest that information may be lost when only the physical aspect of aggregates is used to quantify the activity of ecosystem engineers in soil. …”
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Water saving and economic impacts of land leveling: the case study of cotton production in Tajikistan por Abdullaev, Iskandar, Ul-Hassan, Mehmood, Jumaboev, Kahramon

“…The results showed that laser land leveling can reduce the water application rate in 2004 by 593 M3/ha, in 2005 by 1509 M3/ha and in 2006 by 333 M3/ha in comparison with the unleveled field, located in the similar agro-ecological conditions. The deep percolation was 8% lower and run off 24% less than in non-leveled field. …”
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Costs of aflatoxin in the Kenyan dairy value chain por Senerwa, D.M., Mtimet, Nadhem, Lindahl, Johanna F., Kang'ethe, Erastus K., Grace, Delia

“…Economic costs of aflatoxin contamination could be split into two categories: direct market costs and human health costs. Using agro-ecological zones, five counties in Kenya — Kwale, Isiolo, Tharaka Nithi, Kisii, and Bungoma — were selected randomly for this study. …”
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Soil carbon stocks and stability across an altitudinal gradient in southern Peru por Segnini, A., Posadas, A., Quiróz, R., Milori, D.M.B.P., Vaz Patto, Maria C, Martin Neto, L.

“…Therefore, viable land uses, from the carbon economy perspective, must be promoted to support sustainable agricultural practices for most important ecological conditions.…”
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Fine-mapping of a major QTL controlling angular leaf spot resistance in common bean (Phaseolus vulgaris L.) por Keller, Beat, Manzanares, Chloe, Jara, Carlos E., Lobaton, Juan David, Studer, Bruno, Raatz, Bodo

“…Breeding for resistant cultivars is the most ecological and economical means to control ALS and is particularly important for yield stability in low-input agriculture. …”
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Soil organic carbon and nutrient contents are not influenced by exclosures established in communal grazing land in Nile Basin, northern Ethiopia por Mekuria, Wolde, Langan, Simon J., Noble, A.D., Johnston, Robyn M.

“…Land degradation through extensification of agriculture and overgrazing is an increasing problem across large expanses of the Ethiopian highlands that give rise to a loss in a range of ecosystem services. Ecological restoration through exclosure establishment has become increasingly important approach to reversing degraded ecosystems in Ethiopia and particularly in the Amhara regional state, northern Ethiopia. …”
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Towards a more holistic research approach to plant conservation: the case of rare plants on oceanic islands por Silva, L., Furtado Dias, E., Sardos, J., Brito de Azevedo, E., Schafer, H., Moura, M.

“…However, holistic studies, addressing several key issues, might be more useful, supporting management programs, while unravelling basic knowledge about ecological and population level processes. A more comprehensive approach to research is proposed, encompassing: phylogenetics/systematics, pollination biology and seed dispersal, propagation, population genetics, species distribution models (SDMs), threats and monitoring. …”
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Predictive factors and risk mapping for Rift Valley fever epidemics in Kenya por Munyua, P.M., Murithi, R.M., Ithondeka, P.M., Hightower, A., Thumbi, Samuel M., Anyangu, S.A., Kiplimo, Jusper Ronoh, Bett, Bernard K., Vrieling, A., Breiman, R.F., Njenga, M.K.

“…Using surveillance records collected between 1951 and 2007, we determined the risk of exposure and outcome of an RVF outbreak, examined the ecological and climatic factors associated with the outbreaks, and used these data to develop an RVF risk map for Kenya. …”
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Heterosis and combining ability of elite maize inbred lines under northern corn leaf blight disease prone environments of the mid-altitude tropics por Abera, W., Hussein, S., Derera, J., Worku, M., Laing, M.

“…The hybrids, parents and three standard check varieties were evaluated using an alpha lattice design with two replications across seven environments in the mid-altitude sub-humid agro-ecologies in Ethiopia. The new top ranking hybrids displayed up to 250 % high-parent heterosis and mid-parent heterosis for grain yield and up to −25 % high-parent mid-parent heterosis for NCLB reaction. …”
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Relative severity of fumonisin contamination of cereal crops in West Africa por Vismer, H., Shephard, G.S., Rheeder, J.P., Westhuizen, L. van der, Bandyopadhyay, Ranajit

“…Traditional and improved varieties of maize, pearl millet and sorghum were planted by small-scale farmers under the direction of the International Institute for Tropical Agriculture in two Nigerian agro-ecological zones: the Sudan Savanna and the Northern Guinea Savanna. …”
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Link of a ubiquitous human coronavirus to dromedary camels por Corman, V.M., Eckerle, I., Memish, Z.A., Liljander, Anne M., Dijkman, R., Jonsdottir, H., Ngeiywa, K.J.Z.J., Kamau, E., Younan, M., Al Masri, M., Assiri, A., Gluecks, Ilona V., Musa, B.E., Meyer, B., Müller, M.A., Hilali, Mosaad, Bornstein, S., Wernery, U., Thiel, V., Jores, Joerg, Drexler, J.F., Drosten, C.

“…Human- and dromedary-derived viruses are each monophyletic, suggesting ecological isolation. One gene of dromedary viruses exists in two versions in camels, full length and deleted, whereas only the deleted version exists in humans. …”
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Mid-term and cost-benefit study of smallholder farmers in Striga-Infested maize and cowpea growing areas of Northern Nigeria por Amaza P., Hassan, M.B., Abdoulaye, Tahirou, Kamara, A., Oluoch. M.

“…The result will also guide the scaling-up and scaling out of the project to other parts of the savanna ecological zones of northern Nigeria. It is within this context that the study was planned. …”
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IPM-omics: from genomics to extension for integrated pest management of cowpea por Agunbiade, T.A., Steele, L., Coates, B., Gassmann, A., Margam, V., Ba, Malick N., Dabiré-Binso, C., Baoua, I., Bello-Bravo, Julia, Seufferheld, F., Sun, W., Tamò, Manuele, Pittendrigh, Barry Robert

“…The information obtained on the temporal fluctuations, spatial distribution, and ecological diversification within target, non-target, and natural enemy populations can be overlaid on a geographic information systems (GIS) map to predict pest outbreaks and to decide how to apply control measures. …”
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Application of in-vitro micropropagation technique for sustainable production of four local taro cultivars [Colocasia esculenta (L.) Schott] in Cameroon por Manju, B.E., Mbong, A.G., Fokunang, Charles N., Tembe-Fokunang, E.A., Hanna, R.

“…Taro leaf blight disease has recently been reported in Cameroon to cause between 50 and 100% yields loss of taro in most of the agro-ecological crop growing regions. This has led to a significant reduction in disease-free planting materials, edible crop and increased. …”
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Evaluation of farmers crop production practices that determine Striga gesnerioides infestation of cowpea fields in Nigerian savannas por Dugje, I.Y., Kamara, A.Y., Ekeleme, F.

“…Increase in period of land use and relay intercropping contributed less to reducing infestation, while Phosphorus fertilizer application, use of resistant variety and rotation contributed more to decrease in infestation and increase in yield in both ecological zones. Therefore, the major factors that promote striga infestation are: prolonged land use, growing varieties that are not resistant to striga, continuous cropping of cowpea, inadequate phosphorus fertilization and late planting of cowpea. …”
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Survey of the incidence and distribution of five viruses infecting yams in the major yam producing zones in Benin por Eni, A.O., Hughes, Jacqueline d'Arros, Rey, M.E.C.

“…Surveys were conducted in 2004 and 2005 to determine the incidence and distribution of viruses infecting yams in fourmajor yam-producing agro-ecological zones in Benin. Yam leaves collected from 69 fields and one experimental screen house were indexed for Cucumber mosaic virus (CMV), Dioscorea mottle virus (DMoV), Yam mild mosaic virus (YMMV), Yam mosaic virus (YMV) and yam-infecting badnaviruses [Dioscorea alata bacilliform virus (DaBV) and Dioscorea sansibarensis bacilliform virus (DsBV)] by enzymelinked immunosorbent assay and immunocapture polymerase chain reaction. …”
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Economic analysis of balanced nutrient management technologies for maize production in Kaduna state, Nigeria por Omadachi, U.O., Ahmed, B., Manyong, Victor M., Olukosi, J., Yusuf, O.

“…This is through integrated nutrient management systems geared to land use practices which are economically viable, ecologically sound and socially acceptable. In Kaduna state of Nigeria (Northern Guinea Savannah), three improved maize-based technologies were tested in a series of farmer-managed field trials since 2000. …”
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Diversity of plants in cocoa agroforests in the humid forest zone of Southern Cameroon por Sonwa, D.J., Nkongmeneck, B.A., Weise, Stephan F., Tchatat, M., Adesina, A.A., Janssens, M.J.J.

“…Despite the socio-economic and ecological importance of these systems, few studies have investigated their plant composition. …”
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Beyond trees: Biogeographical regionalization of tropical Africa por Droissart, V., Dauby, G., Hardy, Olivier J., Deblauwe, V., Harris, D.J., Janssens, S., Mackinder, B.A., Blach-Overgaard, A., Sonke, B., Sosef, M.S.M., Stevart, T., Svenning, Jens Christian, Wieringa, J.J., Couvreur, T.L.P.

“…Analyses of spatial patterns using different growth forms are complementary, likely reflecting different evolutionary processes and ecological relationships. The contribution of growth forms to delimit geographical floristic patterns across tropical Africa is of critical importance for land use planning and management, and for selecting priority conservation areas.…”
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Tree genetic resources at risk in South America: A spatial threat assessment to prioritize populations for conservation por Zonneveld, M.J. van, Thomas, E., Castañeda Álvarez, Nora P., Damme, V. van, Alcázar, C., Loo, J., Scheldeman, Xavier

“…ERSs are groups of populations of a specific species in a certain ecological zone of a particular grid cell of a species’ geographic occupancy. …”
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