Understanding the consequences of human-caused global changes, especially the impacts of climatic changes, biological invasions, eutrophication (e.g., increased N deposition), and altered disturbance regimes for biodiversity and ecosystem structure and function. Within this context, my research addresses questions about the functional roles of species in ecosystems, the causes and impacts of loss and gain of genetic and species diversity, the factors that influence species coexistence and patterns of species abundance, and the relative strength of bottom-up (resources) vs. top-down (consumers) controls in structuring communities. My research employs a mixture of empirical approaches (observational, experimental, comparative and synthetic) and utilizes C4-dominated grasslands as experimentally tractable and dynamic model systems.
