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Related Experiment Videos

DNA barcodes for biosecurity: invasive species identification.

K F Armstrong1, S L Ball

  • 1National Centre for Advanced Bio-Protection Technologies, PO Box 84, Lincoln University, Canterbury, New Zealand. armstron@lincoln.ac.nz

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|October 11, 2005
PubMed
Summary

DNA barcoding offers a standardized molecular diagnostic tool for identifying invasive pest insects, improving biosecurity. This method shows high agreement with existing techniques and enhances species identification accuracy.

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Area of Science:

  • Molecular biology
  • Entomology
  • Biosecurity

Background:

  • Biosecurity is crucial for preventing economic harm from invasive pest insects.
  • Current molecular diagnostic tools lack standardization and adaptability.
  • Morphologically indistinct alien species pose identification challenges.

Purpose of the Study:

  • To evaluate DNA barcoding as a standardized tool for identifying invasive pest insects.
  • To compare DNA barcoding with existing PCR-RFLP methods for accuracy and resolution.
  • To assess the adaptability and predictive value of DNA barcoding for biosecurity.

Main Methods:

  • DNA barcoding using the cox1 sequence was applied to tussock moth and fruit fly specimens.
  • Species identifications were compared with historical data from PCR-RFLP of nuclear rDNA.

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  • Specimens were intercepted at the New Zealand border over a decade.

    • Main Results:

    • DNA barcoding showed 90% and 96% agreement with PCR-RFLP for tussock moths and fruit flies, respectively.
    • Improved identification of previously unknown tussock moth specimens to family, genera, or species.
    • Enhanced resolution within fruit fly species complexes was achieved.

    Conclusions:

    • DNA barcoding provides a promising, adaptable, and standardized approach for invasive alien species identification.
    • This method offers a realistic platform for a flexible global biosecurity system.
    • DNA barcoding enhances accuracy and resolution compared to traditional methods.