Cooperative Fish and Wildlife Research Units Program: Maine
Education, Research and Technical Assistance for Managing Our Natural Resources

Maine Project


Understanding the St Croix River Food Web

October 2012 - January 2018


Personnel

Participating Agencies

  • International Joint Commission on St Croix Waterway

In the past several hundred years, the St. Croix River has experienced considerable fluctuations in management and in ecology. The construction of dams, fluctuating impoundment water levels, increased water temperature, restriction of upstream and downstream passage, conversion of riverine to lake habitat, introduction of nonindigenous species and industrial pollution represent a causal suite of impacts that have shifted the structure and function of the system. Understanding how these nutrients are assimilated is crucial to understanding the movement of nutrients and the trophic interactions within of lake systems with migratory species. This research will provide a critical assessment of the status of the ecosystem by a) providing a synthesis of species specific passage and habitat requirements and system limitations in the drainage and, b) model the food web to document conditions in the watershed including the seasonal dynamics of water quality. Project objectives are to: [1] Concurrent with river herring reintroduction actions, provide a synthesis of life cycle, passage and habitat requirements of all sea‐run and riverine migratory fish species native to the St. Croix River. [2] Model the food web to better understand conditions in the watershed including the seasonal dynamics of water quality

Research Publications Publication Date
Barber, B., Gibson. J., O’Malley, A., and Zydlewski, J. (2018) Does what go up also come down? Balancing recruitment with nutrient budget for alewife (Alosa pseudoharengus). Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 10:236–254, DOI: 10.1002/mcf2.10021 | Download May 2018
Presentations Presentation Date
Irish, B., Zydlewski, J., and Cunjak R. (2013) Trophic and Marine Interactions in the St Croix River, Maine. Meeting of the International Joint Commission of the St. Croix Waterway, Calais Maine. INVITED June 24. June 2013
Barber, B. and Zydlewski , J. (2016) Marine-Derived Nutrient Cycling in the St. Croix River, Maine. International St. Croix River Watershed Board Meeting Calais, Maine June 14 June 2016
Barber, B. and Zydlewski, J. (2016) How changes in passage efficiency of alewife at main stem dams can influence nutrient dynamics in the St. Croix River, ME. Maine146th Annual Meeting of the American Fisheries Society. Kansas City, MO. August 23. August 2016
Barber, B., and Zydlewski, J. (2016) Alewife (Alosa pseudoharengus) as Marine-Derived Nutrient Subsidies in Two Northeast Maine Rivers. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine. January 2016
Barber, B., and Zydlewski, J. (2016) Alewife (Alosa pseudoharengus) as Marine-Derived Nutrient Subsidies in Two Northeast Maine Rivers. 2016 Atlantic Salmon Ecosystems Forum. January 6-7. University of Maine, Orono, Maine. January 2016
Barber, B., and Zydlewski, J. (2016) Alewife (Alosa pseudoharengus) as Marine-Derived Nutrient Subsidies in Two Northeast Maine Rivers. Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 23. March 2016
Barber, B., Gibson, J., and Zydlewski, J. (2017) Does what go up also come down? Balancing recruitment with nutrient budget for alewife. 147th Annual Meeting of the American Fisheries Society. Tampa, FL. August 20. August 2017
Barber, B., Gibson, J., and Zydlewski, J. (2017) Marine-Derived Nutrient Cycling in the St. Croix River, Maine Annual meeting of the Maine Cooperative Fish and Wildlife Research Unit, University of Maine, Orono. March 22. March 2017