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The small-scale spatial distribution of an invading moth.

David R Nash1, David J L Agassiz1, H C J Godfray1

  • 1Department of Biology and NERC Centre for Population Biology, Imperial College at Silwood Park, SL5 7PY, Ascot, Berks, UK.

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Summary

The invasive leaf-mining moth Phyllonorycter leucographella spreads differently at small scales. Colonization patterns depend on whether the invasion originates from a broad front or a single source.

Keywords:
DispersalInvasionLeaf minerPopulation dynamicsSpatial scale

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Area of Science:

  • Ecology
  • Invasive Species Biology
  • Entomology

Background:

  • The leaf-mining moth Phyllonorycter leucographella (Zeller) is an invasive species in the British Isles.
  • Previous studies described its large-scale spread using a constant velocity wave model.

Purpose of the Study:

  • To investigate the spatial patterns of P. leucographella colonization at finer scales (1 km²).
  • To understand how invasion dynamics differ between large and small geographical scales.

Main Methods:

  • Mapping the distribution of the moth's foodplant (Pyracantha spp.) within 1-km² quadrats.
  • Precisely documenting the order of bush infestation within these quadrats.
  • Analyzing colonization patterns based on the source of invasion (advancing front vs. localized source).

Main Results:

  • No distinct spatial pattern in bush infestation was observed when sites were colonized by the main advancing front.
  • When colonization originated from a small, localized source within a site, nearby plants showed a tendency to be infested first.
  • No evidence of population turnover was detected post-colonization.

Conclusions:

  • Invasion patterns of P. leucographella vary significantly with spatial scale.
  • A two-stage invasion model can explain the observed differences in colonization patterns at small and large geographical scales.