Dwarf Wedgemussel Habitat Study on the Upper Delaware River

Status: Current

Sponsored by the US Fish and Wildlife Service

This project will determine the effect of changes in flow regime in the Upper Delaware River (UPDE) on dwarf wedgemussel (DWM, Alasmidonta heterodon) beds and develop strategies to avoid such impacts. Results will aid recovery of the dwarf wedgemussel - a federally endangered species. The project will determine habitat available for the DWM in the UPDE with help of MesoHABSIM and River2D habitat models. The spatial distribution habitat between Hancock and Port Jervis, NY, has been determined using digital aerial photography and ground-based surveys. Habitat suitability criteria are based on physical habitat at DWM locations in the UPDE. Aerial thermal imagery and temperature and flow recorders provide detailed information about thermal and hydrological conditions in the river affecting suitability of DWM habitat. The hydrological model (PRMS) is developed in collaboration with USGS to allow for simulation of flow management scenarios for the watershed. The project will provide stake holders with recommendations regarding future flow and habitat management in the river.