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21225.
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21229.More information
Mayotte's coral reefs (342 km2), mangroves (8, 46 km2) and seagrass beds (7,60 km2) provide important ecosystem services of which the most important are the coastal protection, carbon sequestration, water purification and fish biomass production. The quantity and quality of these services have been decreasing steadily for several years and should continue to do so if no action is taken to contain anthropogenic pressures. The coral cover of the fringing reefs and the barrier reef has thus declined respectively by 60 % in 15 years and 15 % in 8 years, while the pioneer front of Sonneratia for mangroves has declined by 13 % in 6 years. As for the water quality, it suggests a degraded state of seagrass beds. The estimated annual value of these services amounts to EUR 151 million. This value would then rise to EUR 188 million if the ecosystems were in pristine conditions. This article shows that the preservation of coastal ecosystems is essential from an economic point of view.
Keywords: Valeurs d'usage indirect, services écosystémiques, récifs coralliens, mangroves, herbiers, Mayotte, Océan indien, Indirect use values, ecosystem services, coral reefs, mangroves, seagrass, Mayotte, Indian Ocean
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21230.More information
This article aims to present the research conducted in recent years by a multidisciplinary team on the questions of land-use conflict, and to reveal the methodology of survey and data collection, as well as the structure of the resulting database. We first define the scope of our study by providing a definition of these conflicts, of their characteristics and motives, of the ways they manifest themselves and of the actors involved. We then present the methodology we have used to identify conflicts ; a methodology based on a spatial analysis and the combined use of different data collection methods including surveys conducted by experts, analyses of the regional daily press and of data from the administrative litigation courts. Finally we present the Conflicts data base©, with its tables and nomenclatures, in which the data collected in different fields is reconciled and analysed (III), before providing a few examples of how this method can be used to analyse the case of the Greater Paris Region.
Keywords: Conflits, Méthodologie, base de données, presse quotidienne, contentieux, entretiens, Conflicts, Methodology, data base, daily press, litigation, surveys