Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
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Dwarf Wedgemussel Propagation and Restoration in the Mid-Atlantic and Northeastern US


August 2018 - May 2021


The dwarf wedgemussel (DWM), Alasmidonta heterodon, is a small, freshwater mussel historically known from at least 15 Atlantic slope drainages from New Brunswick, Canada to North Carolina; however, population declines throughout its range resulted in Federal listing of the species in 1990. The decline of DWM in areas previously thought to have the most viable and largest populations leads to significant concerns about the long-term viability of the species.

The overall goal of this project is to conduct research to inform and guide recovery of DWM through propagation and reintroduction. This project builds upon recent US Fish & Wildlife Service efforts to evaluate DWM habitat and establish a propagation facility for imperiled mussel populations. There are 3 objectives:
1) Develop propagation and culture techniques that optimize survival, growth, and production of mussels at the Cronin Aquatic Resource Center
2) Assess potential locations for restoring DWM populations based on mussel densities, population genetics, host fish densities, and mussel habitat and water quality requirements
3) Evaluate genetic structure of DWM populations and management actions for restoring DWM to preserve genetic diversity
These data will be used to identify management units, develop broodstock genetic guidelines, develop criteria and a decision tree to select ideal locations for reintroduction and augmentation, and ultimately inform recovery and management decisions of this species.


Current Staff

Federal Staff: 3

Masters Students: 5

Phd Students: 11

Post Docs: 2

University Staff: 1

5 Year Summary

Students graduated: 69

Scientific Publications: 35

Presentations: 148



  • Allison RoyPrincipal Investigator
  • Heather GalbraithPrincipal Investigator
  • David PerkinsNon-PI Collaborator
  • Meredith BartronNon-PI Collaborator
  • Sandra DoranNon-PI Collaborator
  • Melissa GraderNon-PI Collaborator
  • Peter HazeltonNon-PI Collaborator
  • Susi von OettingenNon-PI Collaborator
  • Timothy WarrenNon-PI Collaborator
  • Jennifer RyanStudent

Funding Agencies

  • U.S. Geological Survey


Massachusetts Cooperative Fish and Wildlife Research Unit Cooperators

  1. Massachusetts Division of Fisheries and Wildlife
  2. Massachusetts Division of Marine Fisheries
  3. U.S. Fish and Wildlife Service
  4. U.S. Geological Survey
  5. University of Massachusetts
  6. Wildlife Management Institute