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Aquatic Nuisance Species: Effects of Invasive Invertebrate Predators on the Food Webs of the Great lakes--IL/IN Component

We are using a variety of techniques to assess the food-web  consequences of exotic zooplankton species in the Laurentian Great  Lakes. In the past 15 years, two exotic invertebrate predators,  Bythotrephes (the spiny water flea) and Cercopagis (the fish hook  flea), have invaded the Great Lakes. Like most zooplankton, these  organisms are relatively small (<1cm in length) and pelagic but are  both key components of the food web. To date, the effects of both  Bythotrephes and Cercopagis on native invertebrate predators and on  fish remain poorly understood. We are examining experimentally the  interactions between the native and exotic invertebrate predators and  their prey. We also are using a combination of traditional stable  isotope analyses, novel fatty acid analyses, and gut content analyses  to provide a quantitative estimate of the relative importance of  native and exotic invertebrate predators as energetic sources or  sinks for planktonic fish in three of the Great Lakes and Lake  Champlain. Although we have completed all the field work for this  project, we are continuing with laboratory work and analysis. 

In progress
Start Date
End Date
Scope of Study
Field Investigation
Laboratory Investigation
Scale of Phenomena
State Province
Biology And Life History
Population Dynamics
Control And Mitigation
Biological Interactions (Predator/Prey)
Ecosystem Effects
Food Web Structure
Annex Numbers
Research & Development
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats
Aquatic Nuisance Species
  • Annex Numbers
    Annex Numbers
    Research & Development
  • Annex 17
    Annex 17
    Impact of water quality and AIS on fish and wildlife populations and habitats

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