Invasive species are a major driver of change in biodiversity and ecosystem functioning. My research seeks to understand how invasive species influence community structure and ecosystem processes and to assist in predicting and mitigating their impacts. I approach this topic using experimental and theoretical techniques. In the field, I've studied the impacts of many invasive species introduced in Patagonia, Argentina, including deer (Cervus elaphus and Dama dama), wild boar (Sus scrofa), yellow wasps (Vespula germanica), cattle (Bos taurus), and pines (Pinus contorta). To gain a global perspective on impacts of invaders, I have reviewed key literature on plant origin and invasiveness, and compared impacts in the native and introduced ranges. These comparisons allow me to identify the mechanisms that promote invasion and help to focus resources on viable management strategies.




The importance of within-species genetic diversity on ecosystem functioning is growing in prominence. Genetic variation within a species can have strong effects on population, community, and ecosystem processes. For example, different plant genotypes can have strong effects on the population dynamics of associated arthropods. Moreover, differences in plant genotypes can influence both above- and below-ground ecosystem processes such as primary productivity, litter quality, decomposition rates, and nutrient cycling. Working in collaboration with Greg Crutsinger, we explored the influence of genetic diversity across ecosystem boundaries and under climate change.