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EVOLUTION OF TROPHIC LINKAGES IN AN INVADED FOOD WEB

Exotic species invasion has resulted in substantial disruption to Great Lakes food webs and negative effects on fishery species. Most previous studies investigating the dynamics of food web disruption have focused on changes in the abundance of invaders. However, changes in interaction strengths can be as or more important to the overall effect of an invader, yet these effects have only begun to be investigated. We propose to build on and expand current ecological work by investigating the effects of rapid evolutionary changes in an exotic species on its trophic interactions. Specifically, we will quantify contemporary phenotypic and genotypic variation in tail spine length of Great Lakes and inland lake Bythotrephes longimanus using quantitative genetics techniques. We will test whether the size of the spine in Bythotrephes mediates a life history trade-off between the survival benefits of a longer spine and its fecundity costs. We further propose that the relative importance of gape-limited predation dictates the resolution of this trade-off, driving the evolution of spine morphology. We will, therefore, look for evidence of evolutionary changes in this important trait associated with Bythotrephes establishment within novel North American predator communities. The negative effects of spine length on fish consumption are well established, but we will further test the food web consequences of evolutionary changes since the arrival of Bythotrephes in North America by performing predation experiments between naïve and contemporary Bythotrephes and Daphnia mendotae resurrected from deep and shallow sediment layers, respectively.¬†

Status
In progress
Type
Project
Start Date
End Date
Researchers
Andrea L. JaegerPrincipal Investigator
Associated with 1 projects
Andrew McAdamResearcher
Associated with 1 projects
Scott PeacorResearcher
Associated with 5 projects
Agencies
Great Lakes Fishery Commission $ 121,647.00USDActual

Funding 54 projects for a total of $5,089,137.00
Environmental Protection Agency $ 111,000.00USDActual

Funding 21 projects for a total of $7,345,444.00

Funding 1 projects for a total of $964.00
Scope of Study
Field Investigation
Laboratory Investigation
Scale of Phenomena
Organism
Population
Impact of Pollutants
Exotic Species
Processes
Natural Ecological Processes
Resource Management
Fisheries
Lake Basin Connecting Channels
Lake Michigan
State Province
Michigan
Ontario
Biology And Life History
Genetics
Control And Mitigation
Biological Interactions (Predator/Prey)
Ecosystem Effects
Predator / Prey Interactions
Annex Numbers
Research & Development
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats
Physical and transformational processes affecting delivery of pollutants
General
Aquatic Nuisance Species
Annex
  • Annex Numbers
    Annex Numbers
    Research & Development
  • Annex 17
    Annex 17
    Impact of water quality and AIS on fish and wildlife populations and habitats
    Physical and transformational processes affecting delivery of pollutants

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