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Durant SM, Marino A, Linnell JDC, Oriol-Cotterill A, Dloniak S, Dolrenry S, Funston P, Groom RJ, Hanssen L, Horgan J, Ikanda D, Ipavec A, Kissui B, Lichtenfeld L, McNutt JW, Mitchell N, Naro E, Samna A, Yirga G. Fostering Coexistence Between People and Large Carnivores in Africa: Using a Theory of Change to Identify Pathways to Impact and Their Underlying Assumptions. FRONTIERS IN CONSERVATION SCIENCE 2022. [DOI: 10.3389/fcosc.2021.698631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Coexistence with large carnivores poses challenges to human well-being, livelihoods, development, resource management, and policy. Even where people and carnivores have historically coexisted, traditional patterns of behavior toward large carnivores may be disrupted by wider processes of economic, social, political, and climate change. Conservation interventions have typically focused on changing behaviors of those living alongside large carnivores to promote sustainable practices. While these interventions remain important, their success is inextricably linked to broader socio-political contexts, including natural resource governance and equitable distribution of conservation-linked costs and benefits. In this context we propose a Theory of Change to identify logical pathways of action through which coexistence with large carnivores can be enhanced. We focus on Africa's dryland landscapes, known for their diverse guild of large carnivores that remain relatively widespread across the continent. We review the literature to understand coexistence and its challenges; explain our Theory of Change, including expected outcomes and pathways to impact; and discuss how our model could be implemented and operationalized. Our analysis draws on the experience of coauthors, who are scientists and practitioners, and on literature from conservation, political ecology, and anthropology to explore the challenges, local realities, and place-based conditions under which expected outcomes succeed or fail. Three pathways to impact were identified: (a) putting in place good governance harmonized across geographic scales; (b) addressing coexistence at the landscape level; and (c) reducing costs and increasing benefits of sharing a landscape with large carnivores. Coordinated conservation across the extensive, and potentially transboundary, landscapes needed by large carnivores requires harmonization of top-down approaches with bottom-up community-based conservation. We propose adaptive co-management approaches combined with processes for active community engagement and informed consent as useful dynamic mechanisms for navigating through this contested space, while enabling adaptation to climate change. Success depends on strengthening underlying enabling conditions, including governance, capacity, local empowerment, effective monitoring, and sustainable financial support. Implementing the Theory of Change requires ongoing monitoring and evaluation to inform adaptation and build confidence in the model. Overall, the model provides a flexible and practical framework that can be adapted to dynamic local socio-ecological contexts.
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Delivering Climate-Development Co-Benefits through Multi-Stakeholder Forestry Projects in Madagascar: Opportunities and Challenges. LAND 2020. [DOI: 10.3390/land9050157] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This paper explores multi-stakeholder perspectives on the extent to which forestry projects that pursue ecological restoration and rehabilitation in Madagascar engage with local communities and can co-deliver climate-development benefits. Drawing on mixed methods (policy analysis, semi-structured interviews, participatory site visits and focus groups) in two different forestry contexts, we show that by strengthening access to capital availability, projects can enhance local adaptive capacity and mitigation and deliver local development. We show that active consideration of ecological conservation and action plans early in project design and implementation can co-develop and support monitoring and reporting systems, needed to progress towards integrated climate-compatible development approaches. Climate mitigation benefits remain poorly quantified due to limited interest in, and low capacity to generate, carbon revenues. Monitoring alone does not ensure carbon benefits will materialize, and this research stresses that institutional considerations and strengthened engagement and cooperation between practitioners and communities are key in achieving both climate mitigation and community development impacts. Multiple benefits can be fostered by aligning objectives of multiple landscape actors (i.e., community needs and project developers) and by systematically linking project deliverables, outputs, outcomes and impacts over time, grounded in a theory of change focused on ensuring community buy-in and planning for delivery of tangible benefits.
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Duncan JMA, Haworth B, Boruff B, Wales N, Biggs EM, Bruce E. Managing multifunctional landscapes: Local insights from a Pacific Island Country context. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 260:109692. [PMID: 32090791 DOI: 10.1016/j.jenvman.2019.109692] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Revised: 09/30/2019] [Accepted: 10/06/2019] [Indexed: 06/10/2023]
Abstract
Across Pacific Island Countries, projects and policies are incorporating objectives related to managing landscape multifunctionality to sustain flows of multiple, valued ecosystem services. Strategies to manage natural resources are often not effective, or do not have intended outcomes, if they do not account for local contexts and the varied needs and constraints of stakeholders who rely upon natural resources for their livelihoods. Through fieldwork in Ba, Fiji, local insights were generated concerning the institutional, geographic, and socio-economic factors which determine and challenge i) different stakeholders' ability to access landscape resources, and ii) stakeholders' capacities to benefit from ecosystem services. The following insights were generated from this research which are important for guiding management of landscape multifunctionality. In Ba, hierarchical governance systems present barriers to effective management of landscape multifunctionality, and projects or policies with aims to manage landscapes should establish context appropriate multi-scale governance. Such governance systems should facilitate communication and interaction between different stakeholders, build upon community knowledge, and support communities as key actors in landscape management. Consideration of the spatial footprint of landscape resources, stakeholders' different physical and financial capacities, and the institutional structures that mediate access to resources should be central to landscape management and planning. Various climatic stressors affect flows of ecosystem services from the Ba landscape and people's capacity to access landscape resources; therefore, it is important that management of landscapes also builds resilience to climate stressors.
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Affiliation(s)
- J M A Duncan
- UWA School of Agriculture and Environment, University of Western Australia, Crawley, WA, 6009, Australia.
| | - B Haworth
- Humanitarian and Conflict Response Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - B Boruff
- UWA School of Agriculture and Environment, University of Western Australia, Crawley, WA, 6009, Australia
| | - N Wales
- Geography, Earth Science and Environment, Faculty of Science, Technology & Environment, The University of the South Pacific, Laucala Campus, Suva, Fiji
| | - E M Biggs
- UWA School of Agriculture and Environment, University of Western Australia, Crawley, WA, 6009, Australia
| | - E Bruce
- School of Geosciences, Faculty of Science, University of Sydney, NSW, 2006, Australia
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Briske DD, Coppock DL, Illius AW, Fuhlendorf SD. Strategies for global rangeland stewardship: Assessment through the lens of the equilibrium–non‐equilibrium debate. J Appl Ecol 2020. [DOI: 10.1111/1365-2664.13610] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David D. Briske
- Department of Ecosystem Science & Management Texas A&M University College Station TX USA
| | - D. Layne Coppock
- Department of Environment and Society Utah State University Logan UT USA
| | - Andrew W. Illius
- School of Biological Sciences University of Edinburgh Edinburgh UK
| | - Samuel D. Fuhlendorf
- Natural Resource Ecology and Management Oklahoma State University Stillwater OK USA
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Payment for Ecosystem Services and the Water-Energy-Food Nexus: Securing Resource Flows for the Affluent? WATER 2019. [DOI: 10.3390/w11061143] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Payment for Ecosystem Services (PES) is not only a prominent, globally promoted policy to foster nature conservation, but also increasingly propagated as an innovative and self-sustaining governance instrument to support poverty alleviation and to guarantee water, food, and energy securities. In this paper, we evaluate a PES scheme from a multi-scalar and political-ecology perspective in order to reveal different power dynamics across the Water-Energy-Food (WEF) Nexus perspective. For this purpose, we analyze the PES scheme implemented in the Hidrosogamoso hydropower project in Colombia. The paper shows that actors’ strongly divergent economic and political power is determinant in defining how and for whom the Nexus-related water, food, and energy securities are materialized. In this case, the PES scheme and its scalar politics, as fostered by the private/public hydropower alliance, are instrumental to guaranteeing water security for the hydropower scheme, which is a crucial building-block of Colombia’s energy security discourse. For this, the water and food securities of the adjacent, less powerful communities are sacrificed. Examining the on-the-ground politics of WEF Nexus is key to understanding their impact on equitable and sustainable governance of water, energy, and food in the everyday lives of millions of resource users. We conclude that politicizing the Nexus can help to trace both the flows of resources and the flows of power.
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Moukrim S, Lahssini S, Naggar M, Lahlaoi H, Rifai N, Arahou M, Rhazi L. Local community involvement in forest rangeland management: case study of compensation on forest area closed to grazing in Morocco. RANGELAND JOURNAL 2019. [DOI: 10.1071/rj17119] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Unmanaged livestock grazing is the greatest threat to the health and sustainability of forest rangelands in Morocco. Historically, communities have developed ingenious traditional systems in order to regulate natural resource uses. However, currently most of these principles have been undermined and have led to open access of a common pool resource. To achieve viable solutions to unmanaged livestock grazing in forestlands, local community involvement was introduced in Moroccan forestry early on. The main objective of this study was to show the importance of an original mechanism called compensation on forest area closed to grazing, carried out by the Forestry Department to involve communities that have the right of use in the restoration of forest rangeland ecosystems. It also aims to assess the mechanism’s technical and socioeconomic impacts.
Analysis of the process of community participation in the case of Moroccan forest management revealed that it was perceived and implemented in different ways, and considered either as an end in itself or (rarely) as a means to an end. Forest managers and use-rights holders appreciate the mechanism of compensation for forest areas closed to grazing. Since the implementation of this program, the number of grazing association members has increased. This trend has been associated with a positive impact on the reduction in the number of offences and on improving reforestation success rates. In addition, remote sensing showed a positive trend in the relative density and the evolution of the health of vegetation in the areas covered by this mechanism. This program helped to develop consensus in forest ecosystem restoration that will help managers to break the vicious cycle of unmanaged grazing, and promote a new collective stewardship of this precious land. As a result of this success, this program should be replicated and valued. It should be presented in the future as a tool for natural resource conservation with unintended human capital development benefits.
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A Framework of Payment for Ecosystem Services to Protect Cropland: A Case Study of the Yangtze River Delta in China. SUSTAINABILITY 2018. [DOI: 10.3390/su10010178] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Potential Impact of the REDD+ Program on Poverty Reduction in Nghe An Province, Vietnam. FORESTS 2017. [DOI: 10.3390/f8100376] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Murtinho F, Hayes T. Communal Participation in Payment for Environmental Services (PES): Unpacking the Collective Decision to Enroll. ENVIRONMENTAL MANAGEMENT 2017; 59:939-955. [PMID: 28265720 DOI: 10.1007/s00267-017-0838-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Accepted: 02/17/2017] [Indexed: 06/06/2023]
Abstract
Payment for Environmental Service programs are increasingly applied in communal settings where resource users collectively join the program and agree to limit their shared use of a common-property resource. Who decides to join PES and the degree to which community members agree with the collective decision is critical for the success of said programs. Yet, we have limited understanding of the factors that influence communal participation and the collective decision process. This paper examines communal participation in a national payment for conservation program in Ecuador. We use quantitative and qualitative analysis to (i) identify the attributes of the communities that participate (or not), and factors that facilitate participation (n = 67), and (ii) assess household preference and alignment with the collective decision to participate (n = 212). Household participation preferences indicate varying degrees of consensus with the collective decision to participate, with those using the resource less likely to support participation. At the communal level, however, our results indicate that over time, those communities that depend more heavily on their resource systems may ultimately choose to participate. Our findings suggest that communal governance structures and outside organizations may be instrumental in gaining participation in resource-dependent communities and building consensus. Findings also point to the need for further research on communal decision-processes to ensure that the collective decision is based on an informed and democratic process.
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Affiliation(s)
- Felipe Murtinho
- International Studies and Institute of Public Service, Seattle University, 901 12th Ave, Seattle, WA, 98122, USA.
| | - Tanya Hayes
- Institute of Public Service and Environmental Studies, Seattle University, 901 12th Ave, Seattle, WA, 98122, USA
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Louhaichi M, Yigezu YA, Werner J, Dashtseren L, El-Shater T, Ahmed M. Financial incentives: Possible options for sustainable rangeland management? JOURNAL OF ENVIRONMENTAL MANAGEMENT 2016; 180:493-503. [PMID: 27288553 DOI: 10.1016/j.jenvman.2016.05.077] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 05/25/2016] [Accepted: 05/29/2016] [Indexed: 06/06/2023]
Abstract
Large-scale mismanagement of natural resources emanating from lack of appropriate policies and regulatory framework is arguably one of the reasons that led to resource degradation and poor livelihoods in many countries in the Middle East and North Africa (MENA) region. Sustainable rangeland management practices (SRMPs) are considered to be a solution to feed shortages and rangeland degradation. However, the scope for SRMP adoption, has been a subject of debate. Using a case study from Syria and the application of the Minimum Data Analysis method (TOA-MD), this paper provides empirical evidence for ensuring wider adoption of SRMP. The paper argues that the introduction of financial incentives in the form of payments for agricultural-environmental services can increase the economic viability and enhance the adoption of SRMPs and is a better alternative to the unsustainable state subsidies for fodder purchases and barley cultivation on rangelands. Model results indicate that further investment in reasearch toward generating low cost technologies and tailored governance strategies including a financial incentive system would lead to better management of rangelands and improve livelihoods in the Syrian Badia. These findings are valuable for policy makers, donors as well as development and extension practitioners in the MENA region as they can better inform future courses of actions.
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Affiliation(s)
- Mounir Louhaichi
- Internatinal Center for Agricultural Research in the Dry Areas (ICARDA), Amman, Jordan.
| | - Yigezu A Yigezu
- Internatinal Center for Agricultural Research in the Dry Areas (ICARDA), Amman, Jordan
| | - Jutta Werner
- Internatinal Center for Agricultural Research in the Dry Areas (ICARDA), Amman, Jordan
| | - Lojoo Dashtseren
- Internatinal Center for Agricultural Research in the Dry Areas (ICARDA), Aleppo, Syria
| | - Tamer El-Shater
- Internatinal Center for Agricultural Research in the Dry Areas (ICARDA), Aleppo, Syria
| | - Mohamed Ahmed
- The Food and Agriculture Organization of the United Nations (FAO), Rome, Italy
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Reed MS, Stringer LC, Dougill AJ, Perkins JS, Atlhopheng JR, Mulale K, Favretto N. Reorienting land degradation towards sustainable land management: linking sustainable livelihoods with ecosystem services in rangeland systems. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2015; 151:472-485. [PMID: 25617787 DOI: 10.1016/j.jenvman.2014.11.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 11/04/2014] [Accepted: 11/07/2014] [Indexed: 06/04/2023]
Abstract
This paper identifies new ways of moving from land degradation towards sustainable land management through the development of economic mechanisms. It identifies new mechanisms to tackle land degradation based on retaining critical levels of natural capital whilst basing livelihoods on a wider range of ecosystem services. This is achieved through a case study analysis of the Kalahari rangelands in southwest Botswana. The paper first describes the socio-economic and ecological characteristics of the Kalahari rangelands and the types of land degradation taking place. It then focuses on bush encroachment as a way of exploring new economic instruments (e.g. Payments for Ecosystem Services) designed to enhance the flow of ecosystem services that support livelihoods in rangeland systems. It does this by evaluating the likely impacts of bush encroachment, one of the key forms of rangeland degradation, on a range of ecosystem services in three land tenure types (private fenced ranches, communal grazing areas and Wildlife Management Areas), before considering options for more sustainable land management in these systems. We argue that with adequate policy support, economic mechanisms could help reorient degraded rangelands towards more sustainable land management.
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Affiliation(s)
- M S Reed
- Knowledge ExCHANGE Research Centre of Excellence, Birmingham School of the Built Environment, Birmingham City University, Millennium Point, Curzon Street, Birmingham B4 7XG, UK.
| | - L C Stringer
- Sustainability Research Institute, School of Earth & Environment, University of Leeds, West Yorkshire LS2 9JT, UK
| | - A J Dougill
- Sustainability Research Institute, School of Earth & Environment, University of Leeds, West Yorkshire LS2 9JT, UK
| | - J S Perkins
- Department of Environmental Science, University of Botswana, Private Bag, 00704 Gaborone, Botswana
| | - J R Atlhopheng
- Department of Environmental Science, University of Botswana, Private Bag, 00704 Gaborone, Botswana
| | - K Mulale
- Department of Environmental Science, University of Botswana, Private Bag, 00704 Gaborone, Botswana
| | - N Favretto
- Sustainability Research Institute, School of Earth & Environment, University of Leeds, West Yorkshire LS2 9JT, UK
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Hayes T, Murtinho F, Cárdenas Camacho LM, Crespo P, McHugh S, Salmerón D. Can conservation contracts co-exist with change? Payment for ecosystem services in the context of adaptive decision-making and sustainability. ENVIRONMENTAL MANAGEMENT 2015; 55:69-85. [PMID: 25270248 DOI: 10.1007/s00267-014-0380-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 09/19/2014] [Indexed: 06/03/2023]
Abstract
This paper considers the ability of payment for ecosystem services (PES) programs to operate in the context of dynamic and complex social-ecological systems. Drawing on the experiences of two different PES programs in Latin America, we examine how PES institutions fit with the tenets of adaptive decision-making for sustainable resource management. We identify how the program goals and the connection to the market influence the incentive structure, information gathering, learning and feedback processes, and the structure of decision-making rights, specifically the ability to make and modify resource-use rules. Although limited in their generalizability, findings from the two case studies suggest a tension between the contractual model of PES and adaptive decision-making in natural resource systems. PES programs are not inherently decentralized, flexible management tools, as PES contracts tend to restrict decision-making rights and offer minimal flexibility mechanisms to change resource-use practices over the duration of the contract period. Furthermore, PES design and flexibility is heavily dependent on the goals and mission of the buyer and the respective market. If PES is to facilitate sustainable resource management, greater attention is needed to assess how the institutional design of the PES contracts influence the motivation and capacity of participants and program officers alike to adaptively manage the respective resource systems.
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Affiliation(s)
- Tanya Hayes
- Institute of Public Service, Environmental Studies Program, Seattle University, 901 12th Ave, Seattle, WA, 98122, USA,
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14
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Dyer J, Stringer LC, Dougill AJ, Leventon J, Nshimbi M, Chama F, Kafwifwi A, Muledi JI, Kaumbu JMK, Falcao M, Muhorro S, Munyemba F, Kalaba GM, Syampungani S. Assessing participatory practices in community-based natural resource management: experiences in community engagement from southern Africa. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2014; 137:137-45. [PMID: 24632402 DOI: 10.1016/j.jenvman.2013.11.057] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 10/29/2013] [Accepted: 11/04/2013] [Indexed: 05/25/2023]
Abstract
The emphasis on participatory environmental management within international development has started to overcome critiques of traditional exclusionary environmental policy, aligning with shifts towards decentralisation and community empowerment. However, questions are raised regarding the extent to which participation in project design and implementation is meaningful and really engages communities in the process. Calls have been made for further local-level (project and community-scale) research to identify practices that can increase the likelihood of meaningful community engagement within externally initiated projects. This paper presents data from three community-based natural resource management (CBNRM) project case studies from southern Africa, which promote Joint Forest Management (JFM), tree planting for carbon and conservation agriculture. Data collection was carried out through semi-structured interviews with key stakeholders, community-level meetings, focus groups and interviews. We find that an important first step for a meaningful community engagement process is to define 'community' in an open and participatory manner. Two-way communication at all stages of the community engagement process is shown to be critical, and charismatic leadership based on mutual respect and clarity of roles and responsibilities is vital to improve the likelihood of participants developing understanding of project aims and philosophy. This can lead to successful project outcomes through community ownership of the project goals and empowerment in project implementation. Specific engagement methods are found to be less important than the contextual and environmental factors associated with each project, but consideration should be given to identifying appropriate methods to ensure community representation. Our findings extend current thinking on the evaluation of participation by making explicit links between the community engagement process and project outcomes, and by identifying further criteria that can be considered in process and outcome-based evaluations. We highlight good practices for future CBNRM projects which can be used by project designers and initiators to further the likelihood of successful project outcomes.
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Affiliation(s)
- J Dyer
- Sustainability Research Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK.
| | - L C Stringer
- Sustainability Research Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
| | - A J Dougill
- Sustainability Research Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
| | - J Leventon
- Sustainability Research Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
| | - M Nshimbi
- School of Natural Resources, Copperbelt University, Box 21692, Kitwe, Zambia
| | - F Chama
- School of Natural Resources, Copperbelt University, Box 21692, Kitwe, Zambia
| | - A Kafwifwi
- School of Natural Resources, Copperbelt University, Box 21692, Kitwe, Zambia
| | - J I Muledi
- Faculty of Agronomy, University of Lubumbashi, Lubumbashi, Democratic Republic of the Congo
| | - J-M K Kaumbu
- Faculty of Agronomy, University of Lubumbashi, Lubumbashi, Democratic Republic of the Congo
| | - M Falcao
- Eduardo Mondlane University, Department of Forestry, PO Box 257, Maputo, Mozambique
| | - S Muhorro
- Eduardo Mondlane University, Department of Forestry, PO Box 257, Maputo, Mozambique
| | - F Munyemba
- Faculty of Agronomy, University of Lubumbashi, Lubumbashi, Democratic Republic of the Congo
| | - G M Kalaba
- Faculty of Agronomy, University of Lubumbashi, Lubumbashi, Democratic Republic of the Congo
| | - S Syampungani
- School of Natural Resources, Copperbelt University, Box 21692, Kitwe, Zambia
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Salguero-Gómez R, Siewert W, Casper BB, Tielbörger K. A demographic approach to study effects of climate change in desert plants. Philos Trans R Soc Lond B Biol Sci 2013; 367:3100-14. [PMID: 23045708 DOI: 10.1098/rstb.2012.0074] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Desert species respond strongly to infrequent, intense pulses of precipitation. Consequently, indigenous flora has developed a rich repertoire of life-history strategies to deal with fluctuations in resource availability. Examinations of how future climate change will affect the biota often forecast negative impacts, but these-usually correlative-approaches overlook precipitation variation because they are based on averages. Here, we provide an overview of how variable precipitation affects perennial and annual desert plants, and then implement an innovative, mechanistic approach to examine the effects of precipitation on populations of two desert plant species. This approach couples robust climatic projections, including variable precipitation, with stochastic, stage-structured models constructed from long-term demographic datasets of the short-lived Cryptantha flava in the Colorado Plateau Desert (USA) and the annual Carrichtera annua in the Negev Desert (Israel). Our results highlight these populations' potential to buffer future stochastic precipitation. Population growth rates in both species increased under future conditions: wetter, longer growing seasons for Cryptantha and drier years for Carrichtera. We determined that such changes are primarily due to survival and size changes for Cryptantha and the role of seed bank for Carrichtera. Our work suggests that desert plants, and thus the resources they provide, might be more resilient to climate change than previously thought.
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Affiliation(s)
- Roberto Salguero-Gómez
- Evolutionary Biodemography Laboratory, Max Planck Institute for Demographic Research, Rostock, Germany.
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Maestre FT, Salguero-Gómez R, Quero JL. It is getting hotter in here: determining and projecting the impacts of global environmental change on drylands. Philos Trans R Soc Lond B Biol Sci 2013; 367:3062-75. [PMID: 23045705 DOI: 10.1098/rstb.2011.0323] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Drylands occupy large portions of the Earth, and are a key terrestrial biome from the socio-ecological point of view. In spite of their extent and importance, the impacts of global environmental change on them remain poorly understood. In this introduction, we review some of the main expected impacts of global change in drylands, quantify research efforts on the topic, and highlight how the articles included in this theme issue contribute to fill current gaps in our knowledge. Our literature analyses identify key under-studied areas that need more research (e.g. countries such as Mauritania, Mali, Burkina Faso, Chad and Somalia, and deserts such as the Thar, Kavir and Taklamakan), and indicate that most global change research carried out to date in drylands has been done on a unidisciplinary basis. The contributions included here use a wide array of organisms (from micro-organisms to humans), spatial scales (from local to global) and topics (from plant demography to poverty alleviation) to examine key issues to the socio-ecological impacts of global change in drylands. These papers highlight the complexities and difficulties associated with the prediction of such impacts. They also identify the increased use of long-term experiments and multidisciplinary approaches as priority areas for future dryland research. Major advances in our ability to predict and understand global change impacts on drylands can be achieved by explicitly considering how the responses of individuals, populations and communities will in turn affect ecosystem services. Future research should explore linkages between these responses and their effects on water and climate, as well as the provisioning of services for human development and well-being.
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Affiliation(s)
- Fernando T Maestre
- Área de Biodiversidad y Conservación, Departamento de Biología y Geología, ESCET, Universidad Rey Juan Carlos, 28933 Móstoles, Spain.
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Thomas AD. Impact of grazing intensity on seasonal variations in soil organic carbon and soil CO2 efflux in two semiarid grasslands in southern Botswana. Philos Trans R Soc Lond B Biol Sci 2012; 367:3076-86. [PMID: 23045706 PMCID: PMC3479694 DOI: 10.1098/rstb.2012.0102] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Biological soil crusts (BSCs) are an important source of organic carbon, and affect a range of ecosystem functions in arid and semiarid environments. Yet the impact of grazing disturbance on crust properties and soil CO(2) efflux remain poorly studied, particularly in African ecosystems. The effects of burial under wind-blown sand, disaggregation and removal of BSCs on seasonal variations in soil CO(2) efflux, soil organic carbon, chlorophyll a and scytonemin were investigated at two sites in the Kalahari of southern Botswana. Field experiments were employed to isolate CO(2) efflux originating from BSCs in order to estimate the C exchange within the crust. Organic carbon was not evenly distributed through the soil profile but concentrated in the BSC. Soil CO(2) efflux was higher in Kalahari Sand than in calcrete soils, but rates varied significantly with seasonal changes in moisture and temperature. BSCs at both sites were a small net sink of C to the soil. Soil CO(2) efflux was significantly higher in sand soils where the BSC was removed, and on calcrete where the BSC was buried under sand. The BSC removal and burial under sand also significantly reduced chlorophyll a, organic carbon and scytonemin. Disaggregation of the soil crust, however, led to increases in chlorophyll a and organic carbon. The data confirm the importance of BSCs for C cycling in drylands and indicate intensive grazing, which destroys BSCs through trampling and burial, will adversely affect C sequestration and storage. Managed grazing, where soil surfaces are only lightly disturbed, would help maintain a positive carbon balance in African drylands.
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Affiliation(s)
- Andrew D Thomas
- Institute of Geography & Earth Sciences, Aberystwyth University, Aberystwyth, UK.
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