RESUMO
The proliferation of woody plants has been observed on rangelands globally and has significant impacts on subsistence livestock production. However, adaptation strategies to such environmental changes remain largely unexamined. This paper investigates pastoralists' adaptations to such environmental changes in the Borana zone of southern Ethiopia by integrating pastoralists' ecological knowledge, surveys of plant species composition, and census data on livestock holdings. The results indicated that a proliferation of woody plants and corresponding decline in herbaceous species would have negative impact on forage values for cattle and sheep, whereas goats would remain relatively unaffected, and camels would benefit. While census data showed declines in household herd size from 2000 to 2014, pastoralists have been adapting to the proliferation of woody plants by doubling their goat holdings, and wealthier households are investing in camels. These changes in livestock holdings based on indigenous ecological knowledge will mitigate the negative impacts of vegetation shifts on livestock production, and facilitate adaptive environmental management in the pastoral systems.
Assuntos
Agricultura , Ecossistema , Meio Ambiente , Gado , Desenvolvimento Vegetal/fisiologia , Plantas , Animais , Camelus , Bovinos , Ecologia , Etiópia , Cabras , Ovinos , Inquéritos e QuestionáriosRESUMO
Ecological research is increasingly concentrated at particular locations or sites. This trend reflects a variety of advantages of intensive, site-based research, but also raises important questions about the nature of such spatially delimited research: how well does site based research represent broader areas, and does it constrain scientific discovery? We provide an overview of these issues with a particular focus on one prominent intensive research site: the Hubbard Brook Experimental Forest (HBEF), New Hampshire, USA. Among the key features of intensive sites are: long-term, archived data sets that provide a context for new discoveries and the elucidation of ecological mechanisms; the capacity to constrain inputs and parameters, and to validate models of complex ecological processes; and the intellectual cross-fertilization among disciplines in ecological and environmental sciences. The feasibility of scaling up ecological observations from intensive sites depends upon both the phenomenon of interest and the characteristics of the site. An evaluation of deviation metrics for the HBEF illustrates that, in some respects, including sensitivity and recovery of streams and trees from acid deposition, this site is representative of the Northern Forest region, of which HBEF is a part. However, the mountainous terrain and lack of significant agricultural legacy make the HBEF among the least disturbed sites in the Northern Forest region. Its relatively cool, wet climate contributes to high stream flow compared to other sites. These similarities and differences between the HBEF and the region can profoundly influence ecological patterns and processes and potentially limit the generality of observations at this and other intensive sites. Indeed, the difficulty of scaling up may be greatest for ecological phenomena that are sensitive to historical disturbance and that exhibit the greatest spatiotemporal variation, such as denitrification in soils and the dynamics of bird communities. Our research shows that end member sites for some processes often provide important insights into the behavior of inherently heterogeneous ecological processes. In the current era of rapid environmental and biological change, key ecological responses at intensive sites will reflect both specific local drivers and regional trends.
Assuntos
Florestas , Projetos de Pesquisa , Animais , Biodiversidade , Biomassa , Clima , Atividades Humanas , New Hampshire , Movimentos da ÁguaRESUMO
Subjective risk perceptions give rise to unique policy implications as they reflect both the expectation of risk exposure and the ability to mitigate or cope with the adverse impacts. Based on data collected from semistructured interviews and iterative ranking exercises with 159 households in the Altay and Tianshan Mountains of Xinjiang, China, this study investigates and explains the risks with respect to a seriously understudied population and location. Using both geostatistical and econometric methods, we show that although fear of environmental crisis is prevalent among our respondents, recently implemented pastoral conservation, sedentarization, and development projects are more likely to be ranked as the top concerns among affected households. In order to reduce these concerns, future pastoral policy must be built on the livestock economy, and intervention priority should be given to the geographic areas identified as risk hot spots. In cases where pastoralists have to give up their pastures, the transition to other comparable livelihood strategies must be enabled by creating new opportunities and training pastoralists to acquire the needed skills.
Assuntos
Criação de Animais Domésticos , Saúde Ambiental , Medição de Risco , Meio Social , Animais , China , HumanosRESUMO
Ecological calendars are knowledge systems based on close observation of one's habitat to measure and give meaning to time, thereby providing anticipatory capacity for livelihood activities and contributing to food sovereignty. They rely upon seasonal indicators that integrate biophysical and ecological phenomena (e.g., first snowfall, last frost, blossoming of a tree species; seasonal appearance of an animal or plant) with locally grounded cultural meaning and value systems. These context-specific relationships have enabled Indigenous and rural societies to anticipate weather and other seasonal processes in their environment. However, anthropogenic climate change could undermine ecological calendars due to adverse impacts on specific indicators species, but this issue remains unexplored. We address this knowledge gap by examining how anthropogenic climate change might affect selected species (birds, fish, and mammals) that are seasonal and key to Indigenous food systems in two Western Arctic communities. We leverage existing dietary animal datasets to which we apply a novel methodology for assessing organismal vulnerability to climate change. The methodology uses intrinsic species traits such as physiological tolerances, genetic variability, and life history traits to generate an empirical and integrative assessment of vulnerability for any given species. Subsequently, an aggregate view of vulnerability across calendar species is achieved through comparative statistical analysis across species both within and between communities. This exercise permits the first quantitative assessment of the continued relevance and effective use of an ecological calendar, thus demonstrating that food sovereignty and livelihood security is enhanced by biodiversity of indicator species.
RESUMO
Indigenous food sovereignty relies on ecological knowledge of plants and animals, including knowledge related to their development and behavior through the seasons. In the context of anthropogenic climate change, ecological calendars based on Indigenous knowledge may enable communities to anticipate seasonal phenomena. We conducted research with communities in the Standing Rock Nation (North and South Dakota, USA) to develop ecological calendars based on their ecological knowledge. We present ecological calendars developed in seven communities through a series of workshops and interviews. These calendars are rich with knowledge about temporal relations within each community's ecosystem, including the use of plants and animals as seasonal indicators and cues for food system activities. However, the calendars also reveal the impacts of cultural genocide wrought by the United States government in its efforts to colonize the lands and minds of Indigenous communities. Given the diversity of knowledge among Standing Rock communities, we identify opportunities for knowledge exchange to revitalize ecological relations at the heart of food sovereignty. We highlight the potential for ecological calendars to facilitate climate adaptation by enabling communities to synchronize their food systems with an increasingly variable climate.
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The first Global Assessment of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) found widespread, accelerating declines in Earth's biodiversity and associated benefits to people from nature. Addressing these trends will require science-based policy responses to reduce impacts, especially at national to local scales. Effective scaling of science-policy efforts, driven by global and national assessments, is a major challenge for turning assessment into action and will require unprecedented commitment by scientists to engage with communities of policy and practice. Fulfillment of science's social contract with society, and with nature, will require strong institutional support for scientists' participation in activities that transcend conventional research and publication.