Cooperative Research Units
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Betsy Barber

Betsy Irish


  • University of Maine 2018
  • MS University of New Brunswick Saint John 2013
  • BS University of Maine at Machias 2009


I am originally from Grand Island, NE but moved to Maine to study marine biology. I am interested in community ecology, and my past focus was on predator/prey interactions. Recently my study interests have shifted toward fisheries ecology. I love hiking in Maine (there are so many trees!), as well as relaxing with a good book and a cup of tea.

Research Interests

My research is focusing on trophic and marine interactions in the St Croix River in northern Maine. The purpose of this study is to determine how the presence of anadromous fishes affects the St Croix watershed, both in terms of nutrient input and in food web interactions. This will be done through the development of a model of the existing food web of alewives (Alosa pseudoharengus) in the St Croix watershed. My study will include both landlocked and anadromous populations, as well as adult and juvenile age classes. The food web will be mapped using stable isotope data procured through sampling river and lake sites. Isotopes will include carbon and nitrogen, which typically show distinct signatures when moving from marine to freshwater environments. The food web produced by this study will help determine how alewives affect the input and output of nutrients within the St Croix watershed.


Current Staff

Federal Staff: 2

Masters Students: 3

Phd Students: 5

Post Docs: 1

University Staff: 13

5 Year Summary

Students graduated: 24

Scientific Publications: 48

Presentations: 270


Contact Information

Tel: (207) 581 - 1340


Maine Cooperative Fish and Wildlife Research Unit Cooperators

  1. Maine Department of Inland Fisheries and Wildlife
  2. U.S. Fish and Wildlife Service
  3. U.S. Geological Survey
  4. University of Maine
  5. Wildlife Management Institute