Mental models are the cognitive representations of the world that frame how people interact with the world. Learning implies changing these mental models. The successful management of complex social-ecological systems requires the coordination of actions to achieve shared goals. The coordination of actions requires a level of shared understanding of the system or situation; a shared or common mental model. We first describe the elicitation and analysis of mental models of different stakeholder groups associated with water management in the Camargue Biosphere Reserve in the Rhône River delta on the French Mediterranean coast. We use cultural consensus analysis to explore the degree to which different groups shared mental models of the whole system, of stakeholders, of resources, of processes, and of interactions among these last three. The analysis of the elicited data from this group structure enabled us to tentatively explore the evidence for learning in the nonstatute Water Board; comprising important stakeholders related to the management of the central Rhône delta. The results indicate that learning does occur and results in richer mental models that are more likely to be shared among group members. However, the results also show lower than expected levels of agreement with these consensual mental models. Based on this result, we argue that a careful process and facilitation design can greatly enhance the functioning of the participatory process in the Water Board. We conclude that this methodology holds promise for eliciting and comparing mental models. It enriches group-model building and participatory approaches with a broader view of social learning and knowledge-sharing issues.

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Biodiversity offsetting (BO) claims to slow down biodiversity loss caused by development projects by generating ecological gains mainly through restoration activities conducted on land acquired to this effect. This leads to social conflicts around accessing land, especially with farmers and other land-users. The purpose of this paper is to analyze the opportunities and challenges of implementing BO by involving farmers through contracts akin to agri-environmental or stewardship schemes to produce ecological gains. We call them Agrienvironmental Biodiversity Offsets Schemes (ABOS) and conduct an empirical analysis of a large ABOS program implemented for a new railway line in Southern France. We examine the effectiveness of ABOS through a survey carried out with 145 farmers and find that the main determinants of ABOS acceptability are: i) socioeconomic factors, ii) social norms, iii) trust with contracting institutions, and iv) ease of integration in farm activities. Although ABOS allow developers to meet their legal requirements, major concerns are raised about additionality, especially through the manifestation of windfall effects, long-term permanence, and noncompliance with contract requirements. We conclude with policy recommendations and research perspectives to improve the implementation of ABOS for both nature and people.