Definition:
Valeur dérivée de l’usage direct des ressources et services d’une zone humide ou de l’interaction avec ces ressources et services. Exemple: valeur des poissons pêchés.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
Edward B. Barbier, Mike Acreman, and Duncan Knowler, 1997, Economic Valuation of Wetlands: a Guide for Policy Makers and Planners, Ramsar