In order to understand the extent to which future coastal wetlands will continue to provide ecosystem services, we need to understand how they will respond to multiple interacting factors that influence ecosystem processes. From the ecosystem level, I investigate the interactions of plants with their environment to develop an integrated understanding of how biotic and abiotic factors interact to regulate primary production and ecosystem services in wetland ecosystems.  At the population level, I use molecular tools to investigate how genetic differences within a species are ecophysiologically and phenotypically expressed under current environmental forcings.  The fusion of global change research and population genetics has uncovered rapid genetic filtering in mutiple systems which will feed back on ecosystem processes and ecosystem services.