Resultados de búsqueda - "ecology"

Height-diameter allometry and above ground biomass in tropical montane forests: insights from the Albertine Rift in Africa por Imani, G., Boyemba, F., Lewis, S., Nabahungu, N.L., Calders, K., Zapfack, L., Riera, B., Balegamire, C., Cuní-Sanchez, A.

“…Tropical montane forests provide an important natural laboratory to test ecological theory. While it is well-known that some aspects of forest structure change with altitude, little is known on the effects of altitude on above ground biomass (AGB), particularly with regard to changing height-diameter allometry. …”
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Relation of yields of soybean and maize to sulphur, zinc and copper status of soils under intensifying cropping systems in the tropical savannas of northeast Nigeria por Kwari, J.D., Kamara, A.Y., Ekeleme, F., Omoigui, L.O.

“…Data were collected on the initial available S, Cu and Zn contents of some samples from 0-15 cm depth from farmers’ compound fields (64) and bush fields (73) in 30 communities across three agro-ecological zones in north-east Nigeria. These were related to the grain yields of soybean and maize varieties from demonstration trials to assess if they are yield determinants of these crops. …”
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Comparative study of banana Xanthomonas wilt spread in mid and high altitudes of the Great Lakes region of Africa por Maina, M., William, T., Ndungo, V., Flora, N., Philip, R., Ranajit, B.

“…Studies have been carried out to examine ecological factors that influence spread of Banana Xanthomonas wilt (BXW) at mid altitudes in Uganda (800-1500masl) and at high altitudes in D.R. …”
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Inclusion of gender in Africa’s climate change policies and strategies por Nyasimi, Mary, Ayanlade, Ayansina, Mungai, Catherine, Derkyi, M., Jegede M.O.

“…Drawing upon a common framework/guideline, we examined commonality in policies, while recognizing the complexity in the social, economic and ecological systems of each country. The chapter further assesses the importance of integrating and mainstreaming gender into Africa’s national adaptations plans of actions (NAPAs), and Intended Nationally Distributed Contributions (INDCs), and the need for better gender oriented climate change policies, programs and plans.…”
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Heterotic patterns of early maturing maize inbred lines in Strigafree and Strigainfested environments por Agbaje, S., Badu-Apraku, Baffour, Fakorede, M.A.B.

“…Three testcross hybrids (TZE-W Pop C0S6Inb50-2-4 x 1368; TZE-W Pop C0S6Inb50-3-4 x 9071 and TZE-WPop C0S6Inb151-1-2 x 9071) had consistently positiveSCA effects in the two environments and are, thereforepotentially good hybrids for both the savanna and forest ecologies.…”
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Contribution of Arbuscular mycorrhizal fungi (AMF), rhizobia and metarhizium anisopliae to cowpea production in Cameroon por Ngakou, A., Nwaga, D., Ntonifor, N.N., Tamo, Manuele, Nebane, C.L.N., Parh, I.A.

“…The objective of this study was to investigate on how the interactions between the microbial syrnbionts (AMF+rhizobia) and the rnycopesticide M. anisopliae can affect the cowpea production in varied agro ecological zones of Cameroon. Cowpea of the Bafia local cultivar was grown from 1999 to 2004 in the Sudano-sahelian (zone-I), Guineasavannah (zone-II), monomodal (zone-IV) and bimodal humid-forest rainfall (zone-V) of Cameroon. …”
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Definition of smallholder Sheko cattle keepers’ breeding objectives through phenotypic ranking and choice experiments in Ethiopia por Bayou, E., Haile, Aynalem, Gizaw, Solomon, Mekasha, Yoseph

“…In choice experiments, the maximum likelihood estimates of the parameters for cow selection were significant in both lowland and midland agro-ecological zones (AEZs), except for calving interval in midland. …”
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Using indigenous knowledge to link hyper-temporal land cover mapping with land use in the Venezuelan Amazon: "The Forest Pulse" por Olivero, J., Ferri, F., Acevedo, P., Lobo, J.M., Fa, J.E., Farfán, M.A., Romero, D., Blanco, G., Real, R.

“…Remote sensing and traditional ecological knowledge (TEK) can be combined to advance conservation of remote tropical regions, e.g. …”
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Reframing the concept of alternative livelihoods por Wright, J.H., Hill, N.A.O., Roe, D., Rowcliffe, J.M., Kümpel, N.F., Day, M., Booker, F., Milner-Gulland, E.J.

“…We therefore recommend use of a sustainable livelihoods approach to understand the role and function of environmentally damaging behaviors within livelihood strategies; differentiate between households in a community that have the greatest environmental impact and those most vulnerable to resource access restrictions to improve intervention targeting; and learn more about the social–ecological system within which household livelihood strategies are embedded. …”
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Quantifying variability in maize yield response to nutrient applications in the northern Nigeria Savanna por Shehu, B.M., Merckx, Roel, Jibrin, J.M., Kamara, A., Rurinda, J.

“…Diagnostic on-farm nutrient omission trials were conducted over two cropping seasons (2015 and 2016) to assess soil nutrients related constraints to maize yield in the northern Nigerian savanna agro-ecological zone and to quantify their variability. Two sets of trials were conducted side by side, one with an open pollinated maize variety (OPV) and the other one with a hybrid maize variety and each set had six equal treatments laid out in 198 farmers’ fields. …”
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Biological control of an invasive pest eases pressures on global commodity markets por Wyckhuys, Kris A.G., Zhang, Wei, Prager, Steven D., Kramer, D.B., Delaquis, Erik, Gonzalez Rodriguez, Carlos Eduardo, Werf, W. van der

“…Our work underlines how ecologically-based tactics support resilience and safeguard primary productivity in (tropical) agro-ecosystems, which in turn help stabilize commodity markets in a similar way as pesticide-centered approaches. …”
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Crop-livestock interaction effect on soil quality and maize yield in northern Ghana por Rahman, N.A., Larbi, Asamoah, Opoku, A., Tetteh, F.M., Hoeschle-Zeledon

“…The results suggest that, small-scale maize-livestock farmers could use either SDSG of 70 head ha–1 with 90 kg ha–1 NFR or SDSG of 140 head ha–1 with 60 kg ha–1 NFR and MPD at 133,333 plants ha–1 to increase grain yield on Ferric lixisols in northern Ghana and similar ecologies in West Africa.…”
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Green bridge crops to manage corn nitrogen nutrition in the Southeastern Argentinean Pampas por Crespo, Cecilia, Corral, Raúl Alejandro, Diez, Santiago, Delgado, Santiago Germán, Dominguez, Germán, Agostini, Maria De Los Angeles, Cendoya, María Gabriela, Sainz Rozas, Hernan Rene, Garcia, Gisela Vanesa, Studdert, Guillermo

“…An ecological intensification of agriculture through the use of green bridge crops (GBC) between cash crops is a way to improve resource use efficiency. …”
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Nitrogen diagnosis for double-cropped maize por Crespo, Cecilia, Martinez, Dionisio Roberto, Wyngaard, Nicolás, Divito, Guillermo, Martinez Cuesta, Nicolás, Barbieri, Pablo

“…Double cropping has been proposed as a strategy to promote ecological intensification. In temperate regions, maize (Zea mays L.) could be a viable option for double cropping. …”
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Phytoextraction of Cu, Cd, Zn and As in four shrubs and trees growing on soil contaminated with mining waste por Heredia, Tatiana Belén, Tapia Balmaceda, Raúl Esteban, Young, Brian Jonathan, Hasuoka, Paul, Pacheco, Pablo, Roqueiro, Gonzalo

“…Their application contributes to the ecological restoration and risk reduction, allowing the recovery of ecosystem services.…”
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Behavioral and physiological changes in the passerine Agelaioides badius following the ingestion of coated seeds with imidacloprid in a 30-day experiment por Poliserpi, Maria Belen, Brodeur, Celine Marie

“…In the wild, these effects may have ecological consequences, by impairing the survival of birds, representing a risk to farmland bird populations.…”
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Stochastic modelling to predict a priori the potential outcomes of different control schemes against the cattle tick Rhipicephalus microplus por Miotti, Camila, Morel, Nicolas, Signorini Porchiett, Marcelo Lisandro, Nava, Santiago

“…The results showed that the model appropriately fits to field data and can simulate the annual variability in female ticks count in animals from different ecological characteristics. The model has also captured the variability that host susceptibility has on tick abundance. …”
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Human-nature interaction approached from a bibliometric analysis of Malthus and Boserup por Leavy, Sebastian, Talamini, Edson

“…As regards the human-environment relationship, i.e., linking the aspects of sustainability, the Malthusian approach is perceived as being closer to the strong sustainability, to ecological economics, subjects linked to the work of Georgescu-Roegen. …”
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Grazing Pressure and Plant Functional Types in Puna Highlands, Northwestern Argentina por Quiroga Mendiola, Mariana, Tálamo, Andrés

“…This index incorporates the heterogeneity of traditional pastoral management. At two ecological sites (Ciénego and Tolar), we sampled paired transects (near-far). …”
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A polyphasic study of non-aflatoxigenic Aspergillus flavus Link, isolates from maize in the Chaco semi-arid region of Argentina = Estudio polifásico de aislados no aflatoxigénicos... por Barontini, Javier Miguel, Alaniz Zanon, María Silvina, Torrico Ramallo, Ada Karina, Druetta, Marcelo Alberto, Luna, Ignacio Martin, Ruiz Posse, Agustina María, Chulze, Sofía Noemí, Gimenez Pecci, Maria De La Paz

“…Santiago del Estero province, east of Tucumán and north of Córdoba encompasses eight agro-climatic zones in the Chaco Semi-arid region, agro-ecologically characterized by a wide temperature range and frequent drought periods that expose the crop to pathogens, particularly Aspergillus flavus. …”
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