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An appraisal of simple tree-mounted shelters for non-lethal monitoring of weta (Orthoptera: Anostostomatidae and Rhaphidophoridae) in New Zealand nature reserves

Journal of Insect Conservation volume 10, pages 261–268 (2006)Cite this article

Abstract

When monitoring rare insect species, or when surveying faunas within nature reserves, it is desirable not to use indiscriminate lethal sampling techniques. In this investigation we assessed the usefulness of simple tree-mounted wooden shelters to monitor endemic weta (Orthoptera) in nature reserves in Canterbury, New Zealand. Fifty shelters were placed out at six sites and examined at three-monthly intervals for a year. A wide variety of invertebrates were found utilizing the shelters, with Arachnida, Blattodea and Collembola being the most common occupants. After three months over 80% of the shelters exhibited signs of use by invertebrates, increasing to 96% after 12 months. Only seven tree weta (Anostostomatidae) and one (dead) ground weta (Hemiandrus sp.) were observed in the shelters over the full 12 month period. There were 52 observations of cave weta (Rhaphidophoridae) in the shelters, 36 of which occurred at one site, Orton Bradley Park. Occupation of the shelters by cave weta was not affected by soil conditions, light intensity or aspect of the shelter. However, cave weta exhibited a preference for shelters less than 50 cm above the ground and for shelters attached to kanuka and vines. Although weta were found in only a small proportion (9%) of the shelters, this method proved useful in confirming the presence of weta without risk of harming vulnerable populations. These shelters are inexpensive and easy to manufacture and have potential for long-term non-lethal monitoring of weta and as a collection/carriage device for live specimens used in conservation translocations.

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Authors and Affiliations

  1. Bio-Protection and Ecology Division, Lincoln University, P.O. Box 84, New Zealand

    Mike H. Bowie

  2. Department of Agricultural Sciences, Imperial College London, Wye, Kent, UK

    Simon Hodge

  3. Department of Entomology, University of Illinois, Urbana, Illinois, IL, 61801, USA

    Jonathan C. Banks

  4. Department of Biology, San Diego State University, San Diego, CA, 92182, USA

    Cor J. Vink

Authors
  1. Mike H. Bowie
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  2. Simon Hodge
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  3. Jonathan C. Banks
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  4. Cor J. Vink
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Correspondence to Mike H. Bowie.

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Bowie, M.H., Hodge, S., Banks, J.C. et al. An appraisal of simple tree-mounted shelters for non-lethal monitoring of weta (Orthoptera: Anostostomatidae and Rhaphidophoridae) in New Zealand nature reserves. J Insect Conserv 10, 261–268 (2006). https://doi.org/10.1007/s10841-005-5594-3

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