| Summary: | Community-based natural resource management (CBNRM) involves a system of local practices designed to regulate access to, and use of, natural resources through rules and norms shared by a set of users. These institutions are usually defined through rational motivations that drive collective action and well-delimited social and spatial boundaries. We discuss the shortcomings of these premises in dynamic ecological systems where the location of resource concentrations is ephemeral. We explore four cases of community-based management of river turtle nesting sites on the lower Amazon floodplain. Despite the high ecological risks, monitoring costs, and limited material benefits, community residents remain motivated to engage in this collective activity. Based on information from numerous studies carried out over a period of two decades, we discuss how motivation to develop CBNRMs has changed over time and space and how intercommunity linkages have contributed to the endurance of this local institution.
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