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| Registros recuperados: 17 | |
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| Mead, A.R.. |
| The history and current taxonomic status of 62 nominal taxa are revised that have been associated in the literature with the subgenus Tholachatina Bequaert, 1950, of genus Archachatina Albers, 1850, and the genus Cochlitoma Férussac, 1821, in the land snail family Achatinidae Swainson, 1840. Tangible, reliable characters have been found in the detailed features of the reproductive anatomy in this family. The results of comparative anatomical study convincingly reflect phylogeny in contrast to the comparative study of only the shell characters. This latter more strongly reflects the effects of the intrinsically variable environment over time. In the present study, both sets of characters are needed to refine identification. Change, and therefore... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Mollusca; Gastropoda; Pulmonata; Achatinidae; Biogeography; Taxonomy; Genital anatomy; Southern Africa; East Africa; 42.73. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/214451 |
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| Ahmed, Mohamed A. M.; Ehui, Simeon K.; Assefa, Yemesrach. |
| Ethiopia holds large potential for dairy development due to its large livestock population, the favorable climate for improved, high-yielding animal breeds, and the relatively disease-free environment for livestock. Given the considerable potential for smallholder income and employment generation from high-value dairy products, development of the dairy sector in Ethiopia can contribute significantly to poverty alleviation and nutrition in the country. Like other sectors of the economy, the dairy sector in Ethiopia has passed through three phases or turning points, following the economic and political policy in the country. In the most recent phase, characterized by the transition towards market-oriented economy, the dairy sector appears to be moving... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Ethiopia; Dairy; Livestock; Dairy products industry; Livestock productivity; Africa; Sub-Saharan Africa; East Africa; Livestock Production/Industries. |
| Ano: 2004 |
URL: http://purl.umn.edu/60321 |
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| Daw, Tim M.; Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden; tim.daw@su.se; Hicks, Christina C.; Lancaster Environment Centre, Lancaster University, UK; Center for Ocean Solutions, Stanford University, Monterey, California, USA; ARC Center of Excellence for Coral Reef Studies, James Cook University, Townsville, Queensland, Australia; christina.c.hicks@gmail.com; Brown, Katrina; Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, UK; katrina.brown@exeter.ac.uk; Chaigneau, Tomas; Environment and Sustainability Institute, University of Exeter, Penryn, Cornwall, UK; T.W.B.Chaigneau@exeter.ac.uk; Januchowski-Hartley, Fraser A.; Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK; f.a.hartley@gmail.com; Cheung, William W. L.; Nippon Foundation-Nereus Program, Institute for the Oceans and Fisheries, The University of British Columbia, Vancouver, B.C., Canada; w.cheung@oceans.ubc.ca; Crona, Beatrice; Global Economic Dynamics and the Biosphere, Royal Swedish Academy of Science, Stockholm, Sweden; Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden; beatrice.crona@su.se; Coulthard, Sarah; Northumbria University, Newcastle upon Tyne, UK; sarah.coulthard@northumbria.ac.uk; Sandbrook, Chris; United Nations Environment Programme World Conservation Monitoring Centre, Cambridge, UK; Department of Geography, University of Cambridge, Cambridge, UK; chris.sandbrook@unep-wcmc.org; Perry, Chris; Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK; C.Perry@exeter.ac.uk; Muthiga, Nyawira A.; Wildlife Conservation Society, Marine Program, Bronx, New York, USA; Wildlife Conservation Society, Marine Program Kenya, Mombasa, Kenya; nmuthiga@wcs.org; Bosire, Jared; WWF Kenya, Nairobi, Kenya; jbosire@wwfkenya.org; McClanahan, Tim R.; Wildlife Conservation Society, Marine Program, Bronx, New York, USA; tmcclanahan@wcs.org. |
| Although ecosystem services are increasingly recognized as benefits people obtain from nature, we still have a poor understanding of how they actually enhance multidimensional human well-being, and how well-being is affected by ecosystem change. We develop a concept of “ecosystem service elasticity” (ES elasticity) that describes the sensitivity of human well-being to changes in ecosystems. ES Elasticity is a result of complex social and ecological dynamics and is context dependent, individually variable, and likely to demonstrate nonlinear dynamics such as thresholds and hysteresis. We present a conceptual framework that unpacks the chain of causality from ecosystem stocks through flows, goods, value, and shares to contribute to the... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Coastal ecosystems; Conceptual framework; East Africa; Environmentalists’ ; Fisheries; Mangroves; Paradox. |
| Ano: 2016 |
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| Siddig, El Fatih Ali; El-Harizi, Khalid; Prato, Bettina. |
| Despite the 2005 Comprehensive Peace Agreement, which brought to an end 20 years of civil war in the Sudan, this country continues to experience smaller-scale conflicts, particularly around access to and control of natural resources. Some observers lay the blame for this on ethnopolitical or tribal divisions. However, this paper argues that there are a variety of factors at play behind these conflicts, notably the combination of resource scarcity with a crisis of governance that is particularly evident in transitional areas like the Kordofan region. To gain a sense of the range of conflicts around natural resources in Kordofan, the authors reviewed existing records such as government archives; conducted interviews with politicians, federal and state... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Conflict management; Natural resource management; Small farmers; Land use; Livelihoods; Public spending; Infrastructure; Property rights; Governance; Sustainability; Sudan; East Africa; Resource /Energy Economics and Policy. |
| Ano: 2007 |
URL: http://purl.umn.edu/42402 |
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| Omongo,Christopher Abu; Namuddu,Annet; Okao-Okuja,Geofrey; Alicai,Titus; van Brunschot,Sharon; Ouvrard,David; Colvin,John. |
| ABSTRACT Cassava is a valued calorific source to millions of Africans who eat it daily and a vital staple for their food security. One of the key constraints to this crop is whiteflies which are both a vector of viral diseases and a direct pest. Although the African cassava whitefly is known to cause physical damage on cassava with considerable tuberous yield loss, a recent whitefly outbreak caused unusually severe damage, which prompted the current reported investigation. Molecular identification of whitefly adults sampled from the affected cassava field revealed the presence of a new whitefly species, Paraleyrodes bondari. This communication is the first report of the occurrence of P. bondari on cassava in Uganda. |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: East Africa; Invasive; Manihot; New pest; Food security. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000400257 |
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| Ecker, Olivier; Weinberger, Katinka; Qaim, Matin. |
| Micronutrient malnutrition is a large public health problem in many developing countries, but its dimensions and determinants are not yet clearly understood, especially with respect to sub- Saharan Africa. Based on 24-hour recall data from rural households in Rwanda, Uganda and Tanzania, this study analyzes dietary patterns to provide a comprehensive picture of the risk of micronutrient deficiencies, with particular emphasis on bioavailable vitamin A, iron and zinc intakes. The results confirm that micronutrient deficiencies are widespread and positively correlated with calorie deficiency. Regression analysis suggests that income growth will bring about important nutritional improvements. However, more targeted interventions are needed, especially for... |
| Tipo: Journal Article |
Palavras-chave: Micronutrient deficiency; Determinants; Nutrient intake; Dietary patterns; East Africa; Food Consumption/Nutrition/Food Safety. |
| Ano: 2010 |
URL: http://purl.umn.edu/93867 |
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| Jama,Bashir; Van Straaten,Peter. |
| Phosphorus deficiency affects around 80% of the acid soils of western Kenya, but fertilizer use is limited due to high prices. This paper explores the potential of local phosphate rocks (PR) as a remedy within the context on an integrated soil fertility management approach. A promising phosphate rock is Minjingu PR (MPR, Tanzania), a sedimentary/biogenic deposit which contains about 13% total P and 3% neutral ammonium citrate (NAC) soluble P. On-farm trials in P-deficient soils in western Kenya demonstrate MPR to be as effective as triple superphosphate (TSP, 20% P) at equal P rates. The benefits are most pronounced with the integration of agroforestry technologies that improve soil fertility. Besides Minjingu PR, Busumbu PR from Uganda (BPR) is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilizers; Maize; Improved fallows; Tithonia; East Africa. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400012 |
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| Bruggen, A.C. van. |
| Gulella annibiodiversitatis spec. nov. is described from a few scattered localities in montane forest above c. 1300 m in southern-central Malaŵi. It is mainly characterized by a smallish (4.9-6.3 mm high), smooth and generally featureless shell without apertural dentition. Gulella menkhorsti spec. nov., has a small (2.3-2.9 mm high) and smooth shell with a six-fold dentition and is probably a restricted range endemic; so far it has only been recorded from the Mpita Forest in southern Malaŵi. A single smooth and small shell (2.7 mm) with a seven-fold apertural dentition from the Misuku Hills in northern Malaŵi also does represent a new species, Gulella crux spec. nov. Another sample from the same area, introduced as Gulella nuchalis spec. nov., has a... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Gastropoda; Pulmonata; Streptaxidae; Gulella; Malawi; East Africa; Taxonomy. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/638094 |
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| Crona, Beatrice Irene; Department of Systems Ecology; beatrice@ecology.su.se. |
| The heterogeneous nature of even small communities has been acknowledged, yet how such heterogeneity is reflected in local ecological knowledge (LEK) among groups of resource users in a community is poorly studied. This study examines the ecological knowledge held by fisher groups using differing gear and operating in different subsystems of a coastal seascape in south Kenya. Knowledge is compared to that of nonfishing groups and is analyzed with respect to the scales of ecological processes and disturbances affecting the ecosystem to identify mismatches of scale between local knowledge and ecological processes, as well as points of convergence upon which emerging scientific and local community information exchange can build and develop. Results reveal... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Heterogeneous; Local ecological knowledge (LEK); Seascape; Kenya; East Africa; Artisanal fishery. |
| Ano: 2006 |
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| Gabre-Madhin, Eleni Z.. |
| This paper examines the effect of transaction costs of search on the institution of grain brokers in Ethiopia. Primary data are used to derive traders’ shadow opportunity costs of labor and of capital from IV estimation of net profits. A twostep Tobit model is used in which traders first choose where to trade and then choose whether to use a broker to search on their behalf. The results confirm traders’ individual rationality in choosing brokerage, showing high transaction costs are linked to increased broker use while high social capital reduces broker use. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Grain; Economic aspects; Grain Prices; Ethiopia; Grain Trade; East Africa; Marketing. |
| Ano: 1999 |
URL: http://purl.umn.edu/97388 |
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| Registros recuperados: 17 | |
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