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My current interests concentrate on the ecology and restoration of grasslands and savannahs, especially the effects of grazing and other disturbances on community and ecosystem processes. Disturbances can directly affect ecosystem processes, such as primary productivity, CO2 uptake and storage (an important component of global change), and herbivore consumption. They can also indirectly affect ecosystems through changes in the diversity and composition of communities. I am measuring these direct and indirect processes in restored and remnant prairies and in experiments that vary plant diversity and composition in field plots.