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Related Experiment Video

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Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout Salvelinus namaycush from Its Prey
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Basin-Specific Pollutant Bioaccumulation Patterns Define Lake Huron Forage Fish.

Gordon Paterson1, Lauren L Di Pierdomenico2, G Douglas Haffner2

  • 1Department of Biological Sciences, Great Lakes Research Centre, Michigan Technological University, Houghton, Michigan, USA.

Environmental Toxicology and Chemistry
|June 6, 2020
PubMed
Summary
This summary is machine-generated.

Lake Huron's food web restructuring varies by basin, with North Channel fish showing lower trophic positions and PCB levels compared to the Main Basin and Georgian Bay. This indicates unequal ecological changes across the lake's distinct areas.

Keywords:
BasinsBloaterLake HuronPolychlorinated biphenylRainbow smeltRound goby

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Area of Science:

  • Environmental Toxicology
  • Ecosystem Ecology
  • Aquatic Food Web Dynamics

Background:

  • Lake Huron, one of the Laurentian Great Lakes, comprises three distinct basins.
  • The ecosystem has undergone significant ecological restructuring, affecting primary production, species dynamics, and predator energy transfer.
  • Previous evidence for restructuring primarily came from the Main Basin, limiting a comprehensive understanding.

Purpose of the Study:

  • To assess spatial variability in polychlorinated biphenyl (PCB) concentrations and stable isotopes (carbon and nitrogen) in forage fish across Lake Huron's basins.
  • To determine if ecological restructuring is uniform throughout the Lake Huron ecosystem.
  • To investigate basin-specific bioaccumulation patterns and their implications for food web dynamics.

Main Methods:

  • Analysis of polychlorinated biphenyl (PCB) concentrations in rainbow smelt, bloater, and round goby.
  • Stable isotope analysis (δ¹³C and δ¹⁵N) to determine trophic positions.
  • Discriminant functions analysis to identify basin-specific PCB congener profiles.

Main Results:

  • Stable isotopes revealed lower trophic positions (0.5–1.0 units) for North Channel fish compared to Main Basin and Georgian Bay conspecifics.
  • Sum PCB concentrations were significantly higher in fish from the Main Basin and Georgian Bay than from the North Channel.
  • Basin-specific PCB congener profiles were identified, mirroring patterns observed in lake trout and indicating differential bioaccumulation.

Conclusions:

  • The degree of food web ecological restructuring in Lake Huron is not uniform across its three basins.
  • Basin-specific PCB profiles suggest that differences in zooplankton communities and trophodynamics influence energy transfer and contaminant bioaccumulation.
  • Understanding these basin-specific differences is crucial for managing Lake Huron's aquatic food webs and contaminant dynamics.