Une évaluation de services écosystémiques sélectionnés par les acteurs locaux du Léguer (22) et de l'Estéron (06), labellisées "sites rivières sauvages"

The preservation of ecosystems in very good condition or with little impact from human activities is a key issue for the protection of biodiversity and the services they provide to society. The aim of our study was to analyse the dynamics of interdependencies between ecosystems in very good condition in rivers labelled "wild river sites" and the various stakeholders who already or potentially benefit from the ecosystem services associated with these rivers. The objective was to highlight the strength of the dependencies and attachments, to raise awareness among these stakeholders, particularly decision-makers, of the significant socio-economic wealth of these ecosystems and, ultimately, to provide useful data to the stakeholders in the area to help them make management and development choices. Two catchment areas, the Léguer (department 22) and the Estéron (06) were analysed with the help of local stakeholders. The study was carried out in three main stages: (i) The collection of initial data for the socio-ecological study of the Estéron and the Léguer and their territory of influence; (ii) The identification of interdependencies, synergies and conflicts between ecosystem services, which highlighted the interest of using the concept of a bundle of services; And (iii) the biophysical and economic evaluation of the ecosystem services selected by the local steering committees, with a focus on the qualification of the inhabitants' attachment to the Léguer Valley, via a willingness-to-pay study based on development scenarios for the territory. Some ecosystem services selected by the local stakeholders of the two areas remain recurrent, such as the availability of lightly treated drinking water, wood energy and carbon sequestration provided by the forest (as well as the "Breton bocage": A particularity of the Léguer), outdoor activities and the notion of attachment of the inhabitants to their valley (Léguer) or the feeling of tranquility of the place (Estéron).