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Registros recuperados: 29
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Pathogens, disease, and the social-ecological resilience of protected areas Ecology and Society
De Vos, Alta; Percy FitzPatrick Institute, Department of Biological Sciences, University of Cape Town, South Africa; Rhodes University, South Africa; a.devos@ru.ac.za; Cumming, Graeme S.; Percy FitzPatrick Institute, Department of Biological Sciences, University of Cape Town, South Africa; ARC Centre of Excellence in Coral Reef Studies, Townsville, Queensland, Australia; graeme.cumming@jcu.edu.au; Cumming, David H. M.; Percy FitzPatrick Institute, Department of Biological Sciences, University of Cape Town, South Africa; Tropical Resource Ecology Programme, University of Zimbabwe, Harare, Zimbabwe; cumming@icon.co.zw; Ament, Judith M.; Percy FitzPatrick Institute, Department of Biological Sciences, University of Cape Town, South Africa; judith.ament@uct.ac.za; Baum, Julia; Percy FitzPatrick Institute, Department of Biological Sciences, University of Cape Town, South Africa; jubaum5@gmail.com; Clements, Hayley S; Percy FitzPatrick Institute, Department of Biological Sciences, University of Cape Town, South Africa; clementshayley@gmail.com; Grewar, John D; Western Cape Government, Department of Agriculture, Elsenburg, South Africa; JohnG@elsenburg.com; Maciejewski, Kristine; Percy FitzPatrick Institute, Department of Biological Sciences, University of Cape Town, South Africa; Krismacski@gmail.com; Moore, Christine; Percy FitzPatrick Institute, Department of Biological Sciences, University of Cape Town, South Africa; School of Geography and the Environment, University of Oxford, UK; christine.moore@ouce.ox.ac.uk.
It is extremely important for biodiversity conservation that protected areas are resilient to a range of potential future perturbations. One of the least studied influences on protected area resilience is that of disease. We argue that wildlife disease (1) is a social-ecological problem that must be approached from an interdisciplinary perspective; (2) has the potential to lead to changes in the identity of protected areas, possibly transforming them; and (3) interacts with conservation both directly (via impacts on wild animals, livestock, and people) and indirectly (via the public, conservation management, and veterinary responses). We use southern African protected areas as a case study to test a framework for exploring the connections between...
Tipo: Peer-Reviewed Insight Palavras-chave: Disease; Identity; Pathogens; Protected areas; Resilience; Social-ecological systems; Southern Africa.
Ano: 2016
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Adaptive Analysis of Locally Complex Systems in a Globally Complex World Ecology and Society
Lynam, Timothy; Tropical Resource Ecology Program, University of Zimbabwe; tlynam@science.uz.ac.zw.
Zambezi Valley agro-ecosystems are environmentally, economically, and institutionally variable. This variability means that it is not possible to measure everything necessary to develop a predictive understanding of them. In particular, because people and their environments are constantly changing, what was measured yesterday may change by tomorrow. Here, I describe elements of the approach that I have developed to address this problem. Called DAAWN, for Detail as and When Needed, the approach advocates an iterative and multiscaled methodology in which we first capture as broad an understanding of the system as possible and then use awareness developed at this scale to identify where to focus subsequent, more detailed, investigations. Because we cannot...
Tipo: Peer-Reviewed Reports Palavras-chave: Comples adaptive systems; Household and resource economics; Livelihood strategies; Modeling; Multi-agent simulation models; Natural resource use; Participatory systems analysis; Southern Africa; Spidergrams.
Ano: 1999
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Scale Mismatches in Social-Ecological Systems: Causes, Consequences, and Solutions Ecology and Society
Cumming, Graeme S; University of Florida; graeme@botzoo.uct.ac.za; Cumming, David H. M.; University of Zimbabwe; cumming@icon.co.zw; Redman, Charles L; Arizona State University; charles.redman@asu.edu.
Scale is a concept that transcends disciplinary boundaries. In ecology and geography, scale is usually defined in terms of spatial and temporal dimensions. Sociological scale also incorporates space and time, but adds ideas about representation and organization. Although spatial and temporal location determine the context for social and ecological dynamics, social-ecological interactions can create dynamic feedback loops in which humans both influence and are influenced by ecosystem processes. We hypothesize that many of the problems encountered by societies in managing natural resources arise because of a mismatch between the scale of management and the scale(s) of the ecological processes being managed. We use examples from southern Africa and the...
Tipo: Peer-Reviewed Synthesis Palavras-chave: Scale; Scale mismatch; Conservation; Management; Ecosystem function; Sociological scale; Southern Africa.
Ano: 2006
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Delivering the Goods: Scaling out Results of Natural Resource Management Research Ecology and Society
Harrington, Larry; International Maize and Wheat Improvement Center (CIMMYT); l.harrington@cgiar.org; White, Jeffrey; ; j.white@cgiar.org; Grace, Peter; Sinclair Knight Merz, Brisbane, Australia; pgrace@skm.com.au; Hodson, David; ; d.hodson@cgiar.org; Hartkamp, Agnes Dewi; Product Organisation Grains, Seeds and Pulses, The Hague, Netherlands; d.hartkamp@wisint.org; Vaughan, Christopher; CO MET Directorate of Environmental Affairs, Namibia; kit@africaonline.com.na; Meisner, Craig; ; cmeisner@bttb.net.bd.
To help integrated natural resource management (INRM) research "deliver the goods" for many of the world's poor over a large area and in a timely manner, the authors suggest a problem-solving approach that facilitates the scaling out of relevant agricultural practices. They propose seven ways to foster scaling out: (1) develop more attractive practices and technologies through participatory research (2) balance supply-driven approaches with resource user demands, (3) use feedback to redefine the research agenda, (4) encourage support groups and networks for information sharing, (5) facilitate negotiation among stakeholders, (6) inform policy change and institutional development, and (7) make sensible use of information management tools, including models...
Tipo: Peer-Reviewed Reports Palavras-chave: Mexico; South Asia; Southern Africa; Conservation tillage; Diffusion of research; Environments; Geographic information systems; Natural resource management; Participatory research; Scaling out; Simulation models; Technology transfer.
Ano: 2001
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Methods for Developing Multiscale Participatory Scenarios: Insights from Southern Africa and Europe Ecology and Society
Kok, Kasper; Wageningen University; Kasper.Kok@wur.nl; Biggs, Reinette (Oonsie); Council for Scientific and Industrial Research (CSIR); University of Wisconsin; biggs@wisc.edu; Zurek, Monika; Food and Agriculture Organization (FAO); zurek@fao.org.
Scenario planning is increasingly recognized as a useful tool for exploring change in social-ecological systems on decadal to centennial time horizons. In environmental decision making, scenario development tends to include participatory methods for engaging stakeholders and is conducted at multiple scales. This paper presents insights from participatory scenario development in two separate multiscale environmental assessments. We find that, to engage stakeholders at multiple scales, it is important that the issues explored at each scale be relevant and credible to stakeholders at that scale. An important trade-off exists between maintaining relevance to stakeholders at different scales and maintaining consistency across scales to allow for comparison of...
Tipo: Peer-Reviewed Insight Palavras-chave: Mediterranean; Multiscale scenario; Participation; Scale; Scenario; Southern Africa.
Ano: 2007
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Evaluating Responses in Complex Adaptive Systems: Insights on Water Management from the Southern African Millennium Ecosystem Assessment (SAfMA) Ecology and Society
Bohensky, Erin; University of Pretoria; ebohensky@zoology.up.ac.za; Lynam, Timothy; University of Zimbabwe; tlynam@science.uz.ac.zw.
Ecosystem services are embedded in complex adaptive systems. These systems are riddled with nonlinearities, uncertainties, and surprises, and are made increasingly complex by the many human responses to problems or changes arising within them. In this paper we attempt to determine whether there are certain factors that characterize effective responses in complex systems. We construct a framework for response evaluation with three interconnected scopes or spatial and temporal domains: the scope of an impact, the scope of the awareness of the impact, and the scope of the power or influence to respond. Drawing from the experience of the Southern African Millennium Ecosystem Assessment (SAfMA), we explore the applicability of this framework to the example of...
Tipo: Peer-Reviewed Reports Palavras-chave: Responses; Complex adaptive systems; Ecosystem services; Southern Africa; Water management; Impact; Awareness; Power.
Ano: 2005
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The Practice of Transboundary Decision Making on the Incomati River: Elucidating Underlying Factors and their Implications for Institutional Design Ecology and Society
Slinger, Jill H.; Delft University of Technology; j.h.slinger@tudelft.nl; Hilders, Marianne; DHV B.V. (Adviesgroep Water, Natuur en Ruimte); Marianne.Hilders@DHV.nl; Juizo, Dinis; Eduardo Mondlane University; juizo@hotmail.com.
The Incomati River Basin is shared by Mozambique, South Africa, and Swaziland. In August 2002, the groundbreaking “Tripartite Interim Agreement on Water Sharing of the Maputo and Incomati Rivers” (the IncoMaputo agreement) was signed. Following reports that the use, availability, and adequacy of information posed problems for future decision making on this transboundary river, the Delft University of Technology initiated a 6-month study in 2003 in which 25 southern African researchers and officials were interviewed. The Joint Incomati Basin Study (Phase I from 1992–1995, and Phase II from 2000–2001) formed a central component in the investigation, because it was viewed by the parties involved as a successful...
Tipo: Peer-Reviewed Reports Palavras-chave: Causal analysis; Decision making; Governance; Information use; Institutions; International water policy; Mozambique; Networks; River-basin management; South Africa; Southern Africa; Swaziland.
Ano: 2010
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Spatial Modeling of Risk in Natural Resource Management Ecology and Society
Jones, Peter; CIAT (International Center for Tropical Agriculture); p.jones@cgiar.org; Thornton, Philip K; International Livestock Research Institute; P.Thornton@cgiar.org.
Making decisions in natural resource management involves an understanding of the risk and uncertainty of the outcomes, such as crop failure or cattle starvation, and of the normal spread of the expected production. Hedging against poor outcomes often means lack of investment and slow adoption of new methods. At the household level, production instability can have serious effects on income and food security. At the national level, it can have social and economic impacts that may affect all sectors of society. Crop models such as CERES-Maize are excellent tools for assessing weather-related production variability. WATBAL is a water balance model that can provide robust estimates of the potential growing days for a pasture. These models require large...
Tipo: Peer-Reviewed Reports Palavras-chave: Crop modeling; Dryland agriculture; Global change; Global Circulation Model; Maize; Markov models; MarkSim; Natural resource management; Risk; Southern Africa; Spatial modeling; Weather simulation.
Ano: 2002
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Late Quaternary climatic changes revealed by luminescence dating, mineral magnetism and diffuse reflectance spectroscopy of river terrace palaeosols: a new form of geoproxy data for the southern African interior ArchiMer
Lyons, Richard; Tooth, Stephen; Duller, Geoff A. T..
The nature, spatial patterns and forcing mechanisms of Quaternary climatic changes across southern Africa remain unresolved and contentious, principally due to the scarcity of continuous and robustly-dated proxy records. We present what we interpret to be a broadly continuous record of late Quaternary climatic change based on optically stimulated luminescence (OSL) dating, and mineral magnetic and diffuse reflectance spectroscopy (DRS) analyses of stacked palaeosols within an overbank alluvial succession along the Modder River, central South Africa. The OSL ages indicate that alluvial sedimentation occurred at a fairly steady rate, averaging similar to 0.15 mm/yr from at least 44 ka until similar to 0.83 ka. This suggests that the palaeosols are...
Tipo: Text Palavras-chave: Erfkroon; Southern Africa; Palaeosol; OSL; Quaternary; Mineral magnetism.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00290/40120/39120.pdf
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Climatic variability in Mfabeni peatlands (South Africa) since the late Pleistocene ArchiMer
Baker, Andrea; Pedentchouk, Nikolai; Routh, Joyanto; Roychoudhury, Alakendra N..
It has been postulated that a bipolar seesaw interhemispheric mechanism dominated the relationship between the Northern and Southern hemisphere climates since the late Pleistocene. A key test for this proposition would be to undertake palaeoenvironmental studies on terrestrial archives in climatically sensitive regions. Southern Africa's contemporary C-3 and C-4 terrestrial plant distributions display a definitive geographical pattern dictated by different growing season rainfall and temperature zones; however, the region is generally archive poor due to its overall semi-arid climate and high relief topography. The Mfabeni peatland, with a basal age of c. 47 k yrs calibrated before present (kcal yr BP), is one of the oldest continuous coastal peat deposits...
Tipo: Text Palavras-chave: Holocene; Pleistocene; Paleoclimatology; Southern Africa; Stable isotopes; Continental biomarkers; Peatland.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00420/53176/83104.pdf
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A late Quaternary record of seasonal sea surface temperatures off southern Africa ArchiMer
Loftus, E.; Sealy, J.; Leng, M. J.; Lee-thorp, J. A..
The southern Cape coastal region is important for understanding both the behavioural history of modern humans, and regional and global climate dynamics, because it boasts a long archaeological record and occupies a key geographical location near the intersection of two major oceans. The western boundary Agulhas Current, implicated in global heat exchange dynamics, is an important modulator of southern African climates and yet we understand its past behaviour only broadly as the Current itself scours the coastal shelf and marine sediment core records necessarily provide little detail. Numerous archaeological sites from both the late Pleistocene and Holocene provide the opportunity for reconstruction of near shore seasonal SST records, which respond both to...
Tipo: Text Palavras-chave: Late Pleistocene; Holocene; Palaeoclimatology; Southern Africa; Agulhas Current; Oxygen isotopes; Mollusc shells; Westerly winds.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00495/60711/83613.pdf
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New species of Maerua (Capparaceae) from Angola Naturalis
Abreu, J.A.; Martins, E.S.; Catarino, L..
Genus Maerua has around 60 species represented on the African continent, of which three have been reported for Angola. Two new species of Maerua (Capparaceae) from Angola are here described. Both are closely similar to M. juncea subsp. juncea, being distinguished by floral traits such as the receptacle, androphore and gynophore (M. pintobastoae) or leaf traits such as venation, as well as size and shape of the ovary and disc shape (M. mendesii). A key for Maerua species occurring in Angola is provided, as well as a table summarizing and comparing the morphological characters for the new species and similar African species. With the description of these two new species, the genus Maerua comprises five species in Angola. Resumo O género Maerua tem cerca de...
Tipo: Article / Letter to the editor Palavras-chave: Angola; Capparaceae; Endemism; Maerua; Southern Africa; Taxonomy.
Ano: 2014 URL: http://www.repository.naturalis.nl/record/526215
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Revision of the family Dipterocarpaceae in Angola Naturalis
Catarino, L.; Martins, E.S.; Abreu, J.A.; Figueira, R..
The diversity of Dipterocarpaceae in Angola is updated to 24 taxa, two species of Marquesia and 22 species and subspecies of Monotes. A new species is described and four new records (three species and one subspecies) are added to the Flora of Angola. The new species, Monotes paivae, occurs in the province of Bié, central Angola. Its diagnostic characters are a persistent indumentum on the entire upper surface of leaves and a woollytomentose indumentum in the lower surface of adult leaves. A key to the species and the respective descriptions is presented. The species of Monotes endemic in the country are mapped and their conservation status is discussed.
Tipo: Article / Letter to the editor Palavras-chave: Dipterocarpaceae; Endemism; Marquesia; Monotes; New species; Southern Africa; Taxonomy.
Ano: 2012 URL: http://www.repository.naturalis.nl/record/525571
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Comparative reproductive anatomy in the South African giant land snails (Gastropoda: Pulmonata: Achatinidae) Naturalis
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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<i>Namibnema papillata</i> gen. et sp. n. and <i>Axonolaimus deconincki</i> sp. n. (Nematoda, Axonolaimoidea) from marine and estuarine beaches of southern Africa OMA
Vincx, M.; Furstenberg, J.P..
<i>Namibnema papillata</i> gen. et sp.n. is closely related to <i>Nicascolaimus punctatus</i> Riemann, 1986. The presence of twelve stomatal rugae, the punctated cuticle and the shape of the pre-anal supplements indicate a relationship with species of the Chromadorina. <i>Axonolaimus deconincki</i> sp.n. is characterized by the complex nature of the gubernaculum.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Namibnema papillata Nicascolaimus punctatus Africa; Southern Africa.
Ano: 1989 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7102
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Micro-Level Analysis of Farmers’ Adaptation to Climate Change in Southern Africa AgEcon
Nhemachena, Charles; Hassan, Rashid M..
Adaptation to climate change involves changes in agricultural management practices in response to changes in climate conditions. It often involves a combination of various individual responses at the farm-level and assumes that farmers have access to alternative practices and technologies available in the region. This study examines farmer adaptation strategies to climate change in Southern Africa based on a cross-section database of three countries (South Africa, Zambia and Zimbabwe) collected as part of the Global Environment Facility/World Bank (GEF/WB) Climate Change and African Agriculture Project. The study describes farmer perceptions to changes in long-term temperature and precipitation as well as various farm-level adaptation measures and barriers...
Tipo: Working or Discussion Paper Palavras-chave: Climate change; Adaptation; Southern Africa; Environmental Economics and Policy; Farm Management.
Ano: 2007 URL: http://purl.umn.edu/42399
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Poverty in Malawi, 1998 AgEcon
Benson, Todd; Machinijili, Charles; Kachikopa, Lawrence.
This paper presents the poverty analysis of the 1997-98 Malawi Integrated Household Survey. The analysis developed basic needs poverty lines, using consumption-based measures of welfare to classify households and individuals as poor and nonpoor. Because consumption data were not of uniform quality across sample households, the analysis made adjustments to derive a more accurate assessment of the incidence of poverty across the country. The analysis provides poverty and inequality estimates for Malawi's population. About 65 percent were unable to meet their basic needs, and poverty was deep and pervasive. The distribution of household welfare was closely examined within the context of the Malawi Poverty Reduction Strategy to guide government action in...
Tipo: Working or Discussion Paper Palavras-chave: Southern Africa; Africa South of Sahara; Poverty; Poverty Analysis; Food Security and Poverty.
Ano: 2004 URL: http://purl.umn.edu/60940
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SHOULD REGIONAL TRADE LIBERALIZATION OF AGRICULTURE BE A POLICY PRIORITY IN SOUTHERN AFRICA? AgEcon
Nin Pratt, Alejandro; Diao, Xinshen; Bahta, Yonas Tesfamariam.
We develop a detailed trade analysis to assess the potential impacts of a free trade agreement (FTA) on the agricultural sector of Southern African countries. We do this by combining the use of a partial equilibrium analysis with bilateral trade data at the four-digit Standard International Trade Classification (SITC) level for 193 agricultural industries in 14 Southern African countries. Results show that the overall welfare effects of a FTA would be positive but small in most countries. Largest benefits would go to countries with a regional comparative advantage for agriculture, while still being inefficient producers of regionally traded commodities. No direct gains for importing countries are expected because a FTA would increase imports from...
Tipo: Conference Paper or Presentation Palavras-chave: Regional trade agreement; Southern Africa; Agricultural trade; Agricultural and Food Policy; Food Security and Poverty; International Relations/Trade; F15; Q17; Q18.
Ano: 2009 URL: http://purl.umn.edu/51734
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Labor requirements and profitability of alternative soil fertility replenishment technologies in Zambia AgEcon
Ajayi, Olu Clifford; Akinnifesi, Festus K..
Low soil fertility is a major concern in agricultural productivity and development policy discourse in sub-saharan Africa. The problem is exacerbated by government withdrawal from fertilizer input markets and the inability of private sector operators to fill the gap. This warranted a search for other nutrient sources to supplement chemical fertilizers. Based on field data collected in Zambia, this study assessed the labor inputs implications of “improved tree fallows”, continuous maize cropping with and without mineral fertilizer and, evaluated the financial profitability of the different land use systems. Results show that agroforestry-based land use systems are more profitable (NPV between $233 and $309 per ha) than farmers’ practice of continuous maize...
Tipo: Conference Paper or Presentation Palavras-chave: Agroforestry; Improved tree fallows; Financial analysis; Production economics; Southern Africa; Sustainable agriculture; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Environmental Economics and Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Land Economics/Use; Production Economics; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008 URL: http://purl.umn.edu/52185
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How Can Safety Nets Do More with Less? General Issues with Some Evidence from Southern Africa AgEcon
Haddad, Lawrence James; Zeller, Manfred.
This paper reviews design features by which safety nets might do more with less. It reviews the current evidence on their success in practice–including three brief reviews of southern Africa experience–and suggests a role for future policy research in furthering the goal of designing safety nets that reduce poverty in a cost-effective way. In doing so, the paper highlights a tension between the large gaps in our knowledge about the design of safety nets and the demand for short-run answers in this area.
Tipo: Working or Discussion Paper Palavras-chave: Southern Africa; Welfare Economics; Safety Nets; Research; Poverty Alleviation; Food Security and Poverty.
Ano: 1996 URL: http://purl.umn.edu/97304
Registros recuperados: 29
Primeira ... 12 ... Última
 

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