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Torch-light Transect Surveys for Moths

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Abstract

The use of light traps in sampling moth populations is an established technique used by entomologists and ecologists. However, trap data partly reflect the variable attractiveness of UV light to different species of moth. There are also potential problems of the practicality and expense of running traps in certain locations.

An alternative method of recording moth populations is developed, using a modification of the transect count technique used for butterflies (Pollard and Yates, 1993) and recently applied to moths (Spalding, 1997). During transects, moths were observed by torch-light in a 5 by 5 m box, before the recorder walked on for 10 paces, and recorded moths in the next 5 m box. The transect approach was tested in the field, alongside traditional light trap and sugar methods.

Transects recorded moth species for relatively little effort, produced repeatable measures of relative density, and provided habitat-specific data. This approach is likely to provide a valuable addition to light trapping in biodiversity inventories, species surveys, and in monitoring the effects of habitat management for conservation.

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Authors and Affiliations

  1. Department of Continuing Education, University of Bristol, 8–10 Berkeley Square, Bristol, UK

    N. Birkinshaw

  2. Centre for Biodiversity and Conservation, School of Biology, University of Leeds, Leeds, UK

    C.D. Thomas

Authors
  1. N. Birkinshaw
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  2. C.D. Thomas
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Birkinshaw, N., Thomas, C. Torch-light Transect Surveys for Moths. Journal of Insect Conservation 3, 15–24 (1999). https://doi.org/10.1023/A:1009674321237

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  • DOI: https://doi.org/10.1023/A:1009674321237

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