Ian Breckheimer studies how plant communities are responding to climate change. His research, based in Mt. Rainier National Park, uses experiments and long-term observations to tease apart which locations in the Park are the most sensitive and most resilient to climate change impacts. He does this by connecting observations from a large network of microclimate sensors to historical and contemporary plant surveys in the park. Using riparian plants as a model system, he also digs deeper into the ecological mechanisms driving sensitivity to climate using a set of reciprocal transplant and neighborhood manipulation experiments.