stratégie paysanne système de production Afrique Agricultural and animal farming practices Agriculture Economic aspects Economics Food and peanuts productions Landholding tension Planning & Development Risk Risk management Sahel Sereer in Sine and Terres neuves Social mobilities Sénégal agriculture agroclimatologie animal nuisible arachide catastrophe naturelle changement social colonisation agricole crise agricole culture de rente culture vivrière dynamique de population foncier rural migration rurale paysannerie