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Access to the groundwater economy has frequently enabled an economic boom but is also believed to increase inequalities between farmers. The present study analyses social changes in a rural community as it entered and evolved in a groundwater economy, and today increasingly has to cope with groundwater depletion. The case study was conducted in the Middle Atlas region of Morocco, where marked social, economic and political differences habitually separated ethnic fractions. Farmers created several collectives to access groundwater resources and support the marketing of newly irrigated crops. Thanks to this new groundwater economy, the social and economic positions of previously marginalised fractions caught up with those of the historically favoured fractions. The basis on which farmers' collectives were organised had evolved and crossed lines between ethnic fractions. The social configurations at local level, which are often considered to influence agrarian change and actors' relations concerning water resources, actually evolve with them. These configurations have a major influence on the dynamics of farmers' collectives. Therefore, paying attention to evolving social configurations at local level is important if the aim is to involve farmers' collectives in the search for governance models to achieve sustainable groundwater use.

Societal Impact Statement Fonio (Digitaria exilis—Kippist—Stapf) is a neglected cereal crop that plays a crucial role in the food and nutritional security of sub-Saharan populations. Currently threatened with extinction in many countries, fonio, like other minor species, could help give insights into the history of African agriculture and provide clues to past social interactions. Highlighting and preserving genetic diversity that can be used to develop improved varieties improves food security. By recognizing the role of indigenous people and local communities (IPLCs) in agrobiodiversity creation and management, this study provides support for strengthening the rights of rural communities and promoting their food and seed sovereignty as outlined in the United Nations UNDROP Declaration. Summary Fonio (Digitaria exilis) is a neglected cereal crop that plays a crucial role in the food and nutritional security of sub-Saharan populations. It is an excellent candidate to diversify agricultural and food systems beyond Africa because of its adaptability and hardiness. However, fonio is threatened with extinction and the factors that organize its genetic diversity remain unknown, despite the fact that this knowledge is necessary to define conservation strategies and uses to achieve sustainable agriculture. Here, we combined social anthropology and population genetics analysis of 158 fonio landraces, thereby generating insight into the genetic diversity, population structure and evolutionary history of fonio cultivation in Senegal. We noted a spatial structure of genetic diversity at two embedded levels, with the first corresponding to the genetic differentiation between ethnic groups and the second to the demographic history of the Mande and Atlantic Congo linguistic families. Selection and seed exchange practices have contributed to shaping fonio genetic diversity at the ethnic level, while the migration of Fulani people over the last 500 years has fragmented the Mandinka