The Arc project is designed to study how the geomorphology of  the North Sacramento-San Joaquin Delta interacts with freshwater inputs and tides to create habitat once favored by native fishes. This study is a unique examination of how local, regional and broad-scale environmental conditions influence fish recruitment, rearing, and reproduction in diverse habitats, including restored wetlands. By combining water quality, nutrient availability, and local input/export data with zooplankton, epibenthic invertebrates, and fish sampling data, a model of ecosystem function is being developed. This model helps inform how effectively tidal marsh restoration projects work to support native fish populations in the region.