Resultados de búsqueda - "altitud"

Characterization of Peatland Soils from the High Andes through 13C Nuclear Magnetic Resonance Spectroscopy por Segnini, A., Souza, A.A. de, Novotny, E.H., Milori, D.M.B.P., Silva, W.T.L. da, Bonagamba, T.J., Posadas, A., Quiróz, R.

“…Whole soil samples from Peruvian bofedales (highland peatlands), located at an average altitude of 3881 m above sea level, were analyzed through 13C solid-state nuclear magnetic resonance (13C SSNMR) spectroscopy. …”
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Assessment of cattle genetic introgression into domestic yak populations using mitochondrial and microsatellite DNA markers por Qi, X.B., Wang, G., Rege, J.E.O., Hanotte, Olivier H., Han Jianlin

“…Although the level of cattle admixture shows a clear geographical structure, with higher levels of admixture in the Qinghai-Tibetan Plateau and Mongolian and Russian regions, and lower levels in the Himalayan and Pamir Plateau region, our results indicate that the level of cattle admixture is not significantly correlated with the altitude across geographical regions as well as within geographical region. …”
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Village poultry production systems in the central highlands of Ethiopia por Dessie, Tadelle, Ogle, B.

“…Participatory rural appraisal (PRA), supported by checklists and intensive case studies on individual households, was carried out in three villages at three different altitudes in the central highlands of Ethiopia. The chicken production system in each village is described and the problems are discussed. …”
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Changes in soil organic matter and phosphorus fractions under planted fallows and a crop rotation system on a Colombian volcanic-ash soil por Phiri, S, Barrios, E., Rao, Idupulapati M., Singh, B.R.

“…One year after treatment, samples were collected from a fine-textured volcanic-ash soil (Oxic Dystropept) of a mid-altitude hillside in southwestern Colombia. The SOM in the sand-size fraction (150–2000 ?…”
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Epidemiology of nematode parasites of sheep around Jimma, southwestern Ethiopia por Haile, Aynalem, Gashaw, A., Tolemariam, T., Tibbo, Markos

“…The FEC and PCV for sheep in Yebu (mid-altitude) district were 126 ± 3.33 and 30.6 ± 0.26, whereas the values for Dedo (highland) were 93 ± 4.35 and 32.0 ± 0.21, respectively. …”
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Current state of knowledge on characterisation of farm animal genetic resources in Ethiopia por Ayalew, W., Getahun, E., Tibbo, Markos, Mamo, Y., Rege, J.E.O.

“…Growing transhumance and migrations in the lower altitude areas have resulted in massive interbreeding between traditionally isolated livestock populations. …”
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Ghana [In West African agriculture and climate change: A comprehensive analysis] por Nutsukpo, Delali Kofi, Jalloh, Abdulai, Zougmoré, Robert B., Nelson, Gerald C., Thomas, Timothy S.

“…Although temperatures are uniformly moderate, there are important variations over different parts of the country, reflecting altitude and distance from the sea.…”
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Distribution of duricrusted bauxites and laterites on the Bamiléké plateau (West Cameroon): constraints from GIS mapping and geochemistry por Momo, M.N., Yemefack, Martin, Tematio, P., Beauvais, A., Ambrosi, J.

“…Field observation and SRTM (Shuttle Radar Topographic Mission) data allowed the differentiation of two lateritic land surfaces separated by a minimum altitude difference of about 60 m. These surfaces constrained by favorable rock types, slope steepness and soil types provided a potential lateritic bauxitic area of 381 km2 (17.2% of the total study site). …”
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Variation in nectar volume and sugar content in male flowers of Musa cultivars grown in Rwanda and their non-effect on the numbers of visiting key diurnal insect vectors of banana... por Rutikanga, A., Tusiime, Geoffrey, Night, G., Ocimati, W., Blomme, Guy

“…The highest nectar volume was recorded among the East African highland cooking cultivars (AAA-genome) in the high altitude site and the short-heavy rainy season. Nectar contained three sugars: glucose, fructose and sucrose, though hexose (glucose and fructose) was dominant. …”
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The dynamics and environmental influence on interactions between cassava brown streak disease and the whitefly, Bemisia tabaci por Jeremiah, S., Ndyetabula, I., Mkamilo, G.S., Haji, S., Muhanna, M., Chuwa, C., Kasele, S., Bouwmeester, H.J.

“…The altitudinal “ceiling” previously thought to restrict the occurrence of CBSD to regions <1,000 masl has been broken as a consequence of the greatly increased abundance of B. tabaci in mid-altitude areas. Among environmental variables analyzed, minimum temperature was the strongest determinant of CBSD incidence. …”
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A widespread facultative hemi-parasitic weed, threatening rice production in Africa por Rodenburg, J., Morawetz JJ, Bastiaans, L.

“…The species has a broad distribution over Africa (at least 35 countries from Madagascar to Senegal and from Sudan to South Africa) and a wide range in altitude (0–2150 m a.s.l.) and environment (waterlogged swamps to moist free-draining uplands). …”
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Soil fertility gradients and production constraints for coffee and banana on volcanic mountain slopes in the east African rift: a case study of Mt. Elgon por Bauw, P. de, Asten, Piet J.A. van, Jassogne, Laurence T.P., Merckx, Roel

“…Thereby, gradients and constraints in macro- and micro-nutrient uptake by coffee and banana are revealed along the toposequence and different altitude-specific nutrient limitations are determined for both crops. …”
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Climate change adaptation of coffee production in space and time por Läderach, Peter R.D., Ramírez Villegas, Julián Armando, Navarro Racines, Carlos Eduardo, Zelaya, Carlos, Martínez Valle, Armando Isaac, Jarvis, Andy

“…Our analysis indicates that incremental adaptation may occur over short-term horizons at lower altitudes, whereas the same areas may undergo transformative adaptation in the longer term. …”
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Comparison of disease patterns assessed by three independent surveys of cassava mosaic virus disease in Rwanda and Burundi por Bouwmeester, H.J., Heuvelink, Gerard B.M., Legg, James P., Stoorvogel, J.J.

“…Correlative relationships were examined for 35 environmental and socio-economic spatial variables of which 31 were correlated to CMD intensity, with the highest correlation coefficients for latitude ()0Æ47), altitude ()0Æ36) and temperature (+0Æ36). The most significant explanatory variables were entered in separate linear regression models for each of the surveys. …”
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Effect of climatic variability on malaria trends in Baringo County, Kenya por Kipruto, E.K., Ochieng, A.O., Anyona, D.N., Mbalanya, M., Mutua, Edna N., Onguru, D., Nyamongo, I.K., Estambale, B.B.A.

“…Methods Climate variables sourced from the International Research Institute (IRI)/Lamont-Doherty Earth Observatory (LDEO) climate database and malaria cases reported in 10 health facilities spread across four ecological zones (riverine, lowland, mid-altitude and highland) between 2004 and 2014 were subjected to a time series analysis. …”
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Acaulospora sieverdingii, an ecologically diverse new fungus in the Glomeromycota, described from lowland temperate Europe and tropical West Africa por Oehl, F., Sýkorová, Z., Błaszkowski, J., Sánchez Castro, I., Coyne, Danny L., Tchabi, A., Lawouin, L., Hountondji, F.C.C., Silva, G.A. da

“…The new species is common in Central Europe only at altitudes below 800 m asl where, to date, it has been detected in crop rotation systems and grasslands in Poland, Germany, France, Switzerland and Italy. …”
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Interactions Between Cassava Mosaic Geminiviruses and Their Vector, Bemisia tabaci (Hemiptera: Aleyrodidae) por Boni, S.B., Rugumamu, C.P., Gerling, D., Nokoe, K.S., Legg, James P.

“…Based on these results, it is concluded that there was no net positive synergistic interaction between CMGs and B. tabaci for either lowland coastal or mid-altitude inland populations. Consequently, other factors seem more likely to be the cause of the “super-abundance,” and require further investigation.…”
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Developing cassava cultivars based on farmers needs and on the agroecological conditions of northwestern Cameroon por Christine, Z., Richard, C., Urs, S., Peter, N., Hanna, R.

“…The broad objectivesof the present study were (a) to specify the need for new cassava varieties; (b) determine the level of G ×E interaction in the area; (c) to suggest an effective way to select cultivars in the agro-ecologically diverseenvironment of the mid-altitudes of Central Africa. We proceeded by a farmers’ evaluation of varieties grownon-station, by a formal on-farm variety trial, and by semi-structured interviews. …”
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Banana Xanthomonas wilt in the DR Congo: impact, spread and management por Ndungo, V., Fiaboe, K.K.M., Mwangi, M.

“…The affected region is in the high altitude agroecological zone and disease appears to be transmitted through a combination of mechanisms including insect vectors and natural factors, e.g. water splash. …”
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Increasing land pressure in East Africa: the changing role of cassava and consequences for sustainability of farming systems por Fermont, A.V., Asten, Piet J.A. van, Giller, Kenneth E.

“…Increasing land pressure during the past three to four decades has transformed farming systems in the mid-altitude zone of East Africa. Traditional millet-, cotton-, sugarcane- and/or banana-based farming systems with an important fallow and/or grazing component have evolved into continuously cultivated cassava or cassava/maize-based systems. …”
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