Hudson River bivalves

The data in this file are population densities of native pearly mussels (three species of Unionidae) and non-native dreissenid mussels (two species: the zebra mussel Dreissena polymorpha and the quagga mussel Dreissena rostriformis bugensis) in the freshwater tidal Hudson River, New York. Population densities are areally weighted, so they give the average density over the entire study area.