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FOOD WEB DYNAMICS AND THIAMINE DEFICIENCY COMPLEX: IDENTIFYING TROPHIC PATHWAYS

Thiamine deficiency caused by thiaminolytic enzymes (i.e.,  thiaminase) in Great Lakes salmonines results in early life stage  mortality and has secondary negative effects collectively referred  to as Thiamine Deficiency Complex (TDC).  Levels of thiaminase  activity vary within and among fish species and among locations in  the Great Lakes, but the sources of thiaminase and trophic transfer  pathways in Great Lakes food webs have not been fully  characterized.  Identification of the pathways of thiaminase  transfer and the sources of thiaminase in Great Lakes food webs is  necessary to identify potential management strategies to mitigate  TDC.  We propose to identify species and trophic pathways that are  associated with the trophodynamics of thiaminase in Great Lakes food  webs.  We hypothesize that high thiaminase activity will  consistently be associated with specific food web components, that  the distribution of thiaminase in Great Lakes food webs is explained  by trophic structure and the presence of Paenibacillus  thiaminolyticus, and that critical thiaminase transfer pathways are  associated with low egg thiamine levels.  Project objectives are to:  1) determine the potential sources of thiaminase in Great Lakes food  webs and determine if the distribution of thiaminase activity among  food web components is explained by trophic structure, 2) determine  whether the distribution of thiaminase activity among food web  components is explained by the distribution of bacterial thiaminase  from P. thiaminolyticus, and 3) identify critical transfer pathways  of thiaminase that are associated with low egg thiamine levels in  lake trout.

Status
In progress
Type
Project
Start Date
End Date
Researchers
Stephen RileyPrincipal Investigator
Associated with 4 projects
Jacques RinchardResearcher
Associated with 3 projects
Allison NiggemyerResearcher
Associated with 1 projects
S. J. NicholsResearcher
Associated with 1 projects
Cathy RichterResearcher
Associated with 1 projects
Donald TillittResearcher
Associated with 2 projects
Edward RosemanResearcher
Associated with 1 projects
Agencies
Great Lakes Fishery Commission $ 1,249,490.00USDActual

Funding 54 projects for a total of $5,089,137.00
Scope of Study
Field Investigation
Scale of Phenomena
Biochemical
Community
Impact of Pollutants
Exotic Species
Processes
Natural Ecological Processes
Resource Management
Fisheries
Lake Basin Connecting Channels
Lake Huron
Lake Michigan
Lake Ontario
Lake Superior
State Province
Illinois
Michigan
New York
Ontario
Wisconsin
Biology And Life History
Parasites and Diseases
Control And Mitigation
Biological Interactions (Predator/Prey)
Ecosystem Effects
Food Web Structure
Annex Numbers
Research & Development
Annex 17
Cause-effect inter-relationships of productivity and ecotoxicity
Impact of water quality and AIS on fish and wildlife populations and habitats
General
Aquatic Nuisance Species
Annex
  • Annex Numbers
    Annex Numbers
    Research & Development
  • Annex 17
    Annex 17
    Cause-effect inter-relationships of productivity and ecotoxicity
    Impact of water quality and AIS on fish and wildlife populations and habitats

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