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Prospecting Microbial Strains for Bioremediation and Probiotics Development for Metaorganism Research and Preservation
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Heritable pollution tolerance in a marine invader.

Louise A McKenzie1, Rob Brooks, Emma L Johnston

  • 1The University of New South Wales, Sydney, Australia. mckenziel@si.edu.au

Environmental Research
|February 8, 2011
PubMed
Summary

Invasive species like Watersipora subtorquata show potential for adaptation to copper pollution. Tolerance to copper is a heritable trait, with larger larvae indicating greater resistance.

Area of Science:

  • Marine Biology
  • Ecology
  • Environmental Toxicology

Background:

  • Global spread of invasive species continues despite antifouling biocides.
  • Non-indigenous species may adapt to metal-polluted environments.
  • Hull fouling is a primary vector for marine invasions.

Purpose of the Study:

  • Investigate copper tolerance in the invasive bryozoan Watersipora subtorquata.
  • Assess potential for adaptation to metal pollution in invasive species.
  • Examine genotype by environment interactions in copper tolerance.

Main Methods:

  • Laboratory-based toxicity assay using Watersipora subtorquata from four Australian populations.
  • Full-sib, split-family design to test for genotype by environment (G×E) interaction.

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  • Measured settlement, metamorphosis (recruitment), and larval size at various copper concentrations.

    • Main Results:

    • Successful recruitment significantly reduced at 80μgL(-1) copper.
    • No significant difference in pollution tolerance between source populations.
    • Significant G×E interaction observed, with high variation in offspring tolerance within populations.
    • Larval size positively correlated with copper tolerance and varied significantly between sites and colonies.

    Conclusions:

    • High variation in copper tolerance suggests significant adaptive potential within Watersipora subtorquata populations.
    • Copper tolerance is a heritable trait, indicating potential for evolutionary adaptation.
    • Larger larval size is linked to increased copper tolerance, possibly due to direct size-related mechanisms.