Maximising trapping efficiency in reptile surveys : the role of seasonality, weather conditions and moon phase on capture success

Spence-Bailey, Lisa M., Nimmo, Dale G., Kelly, Luke T., Bennett, Andrew F. and Clarke, Michael F. 2010, Maximising trapping efficiency in reptile surveys : the role of seasonality, weather conditions and moon phase on capture success, Wildlife research, vol. 37, no. 2, pp. 104-115, doi: 10.1071/WR09157.

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Title Maximising trapping efficiency in reptile surveys : the role of seasonality, weather conditions and moon phase on capture success
Author(s) Spence-Bailey, Lisa M.
Nimmo, Dale G.
Kelly, Luke T.
Bennett, Andrew F.
Clarke, Michael F.
Journal name Wildlife research
Volume number 37
Issue number 2
Start page 104
End page 115
Total pages 12
Publisher CSIRO Publishing
Place of publication Collingwood, Vic.
Publication date 2010
ISSN 1035-3712
Summary Context : Designing an appropriate survey protocol requires understanding of how capture rates of target species may be influenced by factors other than on-ground abundance, such as weather conditions or seasonality. This is particularly relevant for ectotherms such as reptiles, as activity can be affected by environmental conditions such as ambient temperature.
Aims : The present study examines factors affecting capture success of reptiles in semi-arid environments of southern Australia, and addresses the following two main questions: (1) what is the influence of weather and seasonal factors on capture rates of reptiles, and (2) what are the implications for developing an effective protocol for reptile surveys?
Methods : We surveyed reptiles using pitfall traps in spring and summer of 2006/07 and 2007/08 at sites (n = 280) throughout the Murray Mallee region of south-eastern Australia. We used mixed-effect regression models to investigate the influence of seasonal and weather-related variables on species’ capture success.
Key results : Total captures of reptiles, and the likelihood of capture of 15 reptile species, increased with rising daily temperature. Greater numbers of individual species were captured during spring than in summer, even though temperatures were cooler. This probably reflects greater levels of activity associated with breeding. Several species were more likely to be captured when maximum or minimum daily temperatures exceeded a certain level (e.g. Lerista labialis, Delma australis, Nephrurus levis). Other factors, such as rainfall and moon phase, also influenced capture success of some species.
Conclusions : Surveys for reptiles in semi-arid environments are likely to capture the greatest diversity of species on warm days in late spring months, although surveys on hot days in summer will enhance detection of particular species (e.g. Morethia boulengeri, Varanus gouldii). We recommend trapping during periods with maximum temperatures exceeding 25–30C and minimum overnight temperatures of 15C. Finally, trapping during rainfall and full-moon events will maximise chances of encountering species sensitive to these variables (blind snakes and geckoes).
Implications : Selecting the most favourable seasonal and weather conditions will help ensure that reptile surveys maximise the likelihood of capturing the greatest diversity of reptiles, while minimising trap-effort required.
Language eng
DOI 10.1071/WR09157
Field of Research 050202 Conservation and Biodiversity
Socio Economic Objective 960811 Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
HERDC collection year 2010
Copyright notice ©2010, CSIRO
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