Résultats de la recherche
Showing items 1 through 9 of 31.
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Library Resource
Viet Nam, Amérique centrale, Amérique du Sud
This study assesses the presence of a forest transition - that is, a shift from net deforestation to net reforestation - in Vietnam during the 1990s, and describes its key attributes relevant for global environmental change issues. Using Fuzzy Kappa and other indicators, we compared forest cover estimates and spatial patterns from global and national land cover maps from the early and late 1990s, and compiled other available statistics for years before and after that period.
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Library Resource
Co‐management (Co‐M), defined as the sharing of management tasks and responsibilities between governments and local users, is emerging as a powerful institutional arrangement to redress fisheries paradigm failures, yet long‐term assessments of its performance are lacking. A comparative analysis of five small‐scale Latin American shellfisheries was conducted to identify factors suggesting success and failure.
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Library Resource
High transaction costs and an absence of institutional infrastructure in developing countries prevent comprehensive enforcement of intellectual property rights and generate obstacles to the adoption of genetically modified (GM) crop technology.
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Library Resource
Global biodiversity is changing rapidly driven by human alteration of habitat, and nowhere this is more dramatic than in insular habitats. Yet land-cover change is a complex phenomenon that not only involves habitat destruction but also forest recovery over different time scales. Therefore, we might expect species to respond in diverse ways with likely consequences for the reorganization of regional assemblages. These changes, however, may be different in tropical islands because of their low species richness, generalist habits and high proportion of endemics.
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Library Resource
Full and effective participation of indigenous peoples and local communities, and high accuracy estimates are two current requirements for the purposes of monitoring forests at international level. We produced two land cover maps, both of which were based on digital image processing (decision trees) using Rapideye imagery, and a land cover participatory map, for indigenous territories of eastern Panama. Accuracy of the three maps was evaluated using field data.
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Library Resource
Through an examination of interventions in the agrarian structures and rural society of the Ecuadorian Andes over the past 40 years, this article explores the gradual imposition of a particular line of action that separates rural development from the unresolved question of the concentration of land ownership and wealth among the very few. This imposition has been the consequence, it is argued, of the new development paradigms implemented in Andean peasant communities since the end of land reform in the 1970s.
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Library Resource
One of the clearly stated intentions of the Intergovernmental Platform on Biodiversity and Ecosystem Services (IPBES) is to bring both “western scientific” and “indigenous and local” knowledge systems within synthetic global, regional, and thematic assessments. A major challenge will be how to use, and quality‐assure, information derived from different knowledge systems.
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Library Resource
Habitat loss and fragmentation is one of the main causes of biodiversity loss. Rare species are generally thought to be more sensitive to habitat fragmentation than common ones as small populations become even smaller. We did a population genetic study on a rare bird, the Worthen's sparrow Spizella wortheni which is endemic to semi‐arid and arid regions of northeast Mexico. Its population numbers suffer greatly from the transformation of grassland into farmland that leads to a patchy distribution with locally small population sizes.
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Protected area downgrading, downsizing and degazettement (PADDD) is a global phenomenon that has not received formal attention in Reducing Emissions from Deforestation and Forest Degradation (REDD+) policies designed to reduce forest carbon emissions and conserve biodiversity. Here, we examine how PADDD affects deforestation and forest carbon emissions. We documented 174 enacted and 8 proposed PADDD events affecting more than 48,000 km² in three REDD+ priority countries: Democratic Republic of the Congo, Malaysia, and Peru.
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Library Resource
Microsatellite loci that were previously developed in the tropical tree Tabebuia aurea were used for the genetic analysis of Tabebuia roseo-alba populations. Nine of 10 simple sequence repeat markers were amplified, and the polymorphism was assessed in 58 individuals sampled from two stands in southeastern Brazil. All loci were polymorphic with Mendelian inheritance. The allele numbers were high, ranging from 5 to 13 in population I and 3 to 7 in population II, with means of 8.9 and 5.5, respectively.
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