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Human activities are significantly and rapidly altering the form and function of terrestrial ecosystems. For example, we are changing the chemical composition of the atmosphere, converting natural landscapes to urban areas, and transporting floral and faunal species far beyond their natural boundaries. Through both field and lab based experiments, we strive to gain a better understanding of how such anthropogenic changes impact ecosystems. Using a wide range of measurement techniques, our study foci vary in scale from individual leaves to entire ecosystems, Recently, we have included the response of resident fauna who depend upon vegetation for both food and habitat.