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Vancouver workshop: overview and synthesis.

M Watson1

  • 1US Environmental Protection Agency, Region 10, 1200 Sixth Avenue, OEA-095 Seattle, WA 98101, USA. watson.michael@epa.gov

Marine Environmental Research
|September 10, 2003
PubMed
Summary
This summary is machine-generated.

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Vancouver Harbour pollution impacts benthic ecosystems and English sole, showing a clear east-to-west decline in contaminant effects. Some tributyltin (TBT) impacts may be decreasing, but further assessment is needed.

Area of Science:

  • Marine pollution
  • Ecotoxicology
  • Benthic ecology

Background:

  • Vancouver Harbour is a key Canadian ecosystem facing potential pollution pressures.
  • Previous studies suggested impacts from contaminants like tributyltin (TBT).
  • An interdisciplinary assessment was needed to evaluate current pollution levels and biological responses.

Purpose of the Study:

  • To assess sediment and tissue contaminants in Vancouver Harbour.
  • To evaluate biological responses to contaminants across multiple levels of organization.
  • To determine the extent and nature of pollution-related effects in the harbour ecosystem.

Main Methods:

  • Collected sediment and biota (English sole, mollusks, bivalves) samples along a pollution gradient.
  • Analyzed tissue contaminants including tributyltin (TBT).

Related Experiment Videos

  • Assessed biological responses: P-450 expression, EROD induction, liver histopathology in English sole; imposex in neogastropods; benthic community structure; PSP in bivalves.

    • Main Results:

    • A significant east-to-west trend of declining contaminant-associated effects was observed.
    • Benthic community structure was distorted along the pollution gradient.
    • English sole showed biomarker evidence of stress (histological and biochemical) in inner harbour sites.
    • Neogastropods may be recovering from TBT impacts, though some species remain extirpated.
    • Howe Sound sediments may contain unanalyzed P450-inducing pollutants.

    Conclusions:

    • Contaminant-associated biological effects in Vancouver Harbour are pollution-related and decrease from east to west.
    • Pollution has significantly impacted benthic community structure and stressed English sole.
    • While TBT impacts may be lessening, further investigation into other pollutants is warranted.