The discussion about the impact of pastoralists on ecosystems has been profoundly shaped by Hardin's tragedy of the commons that held pastoralists responsible for overgrazing the range. Research has shown that grazing ecosystems are much more complex and dynamic than was previously assumed and that they can be managed adaptively as commons. However, proponents and critics of Hardin's thesis continue to argue that open access to common-pool resources inevitably leads to a tragedy of the commons. A longitudinal study that we conducted of pastoral mobility and primary production in the Logone floodplain in the Far North Region of Cameroon suggest that open access does not have to lead to a tragedy of the commons. We argue that this pastoral system is best conceptualized as an open system, in which a combination of individual decision-making and coordination of movements leads to an ideal-free type of distribution of mobile pastoralists. We explain how this selforganizing system of open access works and its implications for theories of management of common-pool resources and our understanding of pastoral systems.

Droughts across Africa have led to a shift in livestock ownership from impoverished pastoralists to absentee owners who contract hired herders to manage their animals. The assumption has been that these contracts are exploitative and negatively affect herd and rangeland management. We conducted an ethnographic study of a mobile pastoral system in the Far North Region of Cameroon to examine whether herding contracts provide sustainable livelihoods and allow herders to rebuild their herds. We found considerable variation in contracts and livelihoods, and argue that the social organisation of herding contracts may explain why they have no negative impact on herd and rangeland management.

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The mobile pastoral system in the far north region of Cameroon is an excellent example of the paradox of pastoral land tenure, in that pastoralists need secure access to pasture and water, but also flexibility in resource use, i.e. the ability to move elsewhere because of spatio-temporal variation in resource availability. In this paper, we draw from our collective research and development experience with mobile pastoralists and discuss how non-governmental organisations have used ordinances and bureaucratic procedures to protect pastoral resources, in particular transhumance corridors that connect seasonal grazing lands in the far north region. We argue that the mobile pastoral system is best understood as an open system and explain what the implications are for the protection of pastoral resources. We argue that delimiting and protecting transhumance corridors is not the panacea, and we conclude with a discussion of the advantages and disadvantages of this approach.

The discussion about the impact of pastoral systems on ecosystems has been profoundly shaped by Hardin's "tragedy of the commons" argument that held pastoralists responsible for overgrazing the range. Recent studies have shown that grazing ecosystems are much more complex and dynamic than was previously assumed and that pastoralists adaptively manage these systems. However, we still have little understanding how everyday herding affects ecosystems at the landscape level. We conducted a study of daily herd movements and grazing strategies in a mobile pastoral system in the Logone floodplain, Cameroon. We integrated GPS/GIS technology, video recordings of animal behavior, and ethnographic methods to develop a more accurate measurement of grazing pressure that takes into account both livestock densities and grazing behavior. We used the resulting grazing pressure data to evaluate existing conceptual models of grazing pressure at a landscape level. We found that models that predict that grazing pressure is skewed towards the direction of water most accurately reflect the situation in the Logone floodplain in the dry season. However, we found that the higher grazing pressure is not only the result of a higher density of cattle but also a change in the grazing behavior of animals after watering. Finally, we caution that the models of grazing pressure in the dry season cannot simply be extrapolated to the landscape level because mobile pastoralists do not remain in one central place.