To overcome this limitation without increasing the sampling effort and workload, guidance barrier pitfall traps have been introduced. In a conventional simple pitfall trap as proposed by the pioneers Dahl (1896), Barber (1931) and Greenslade (1964) which is basically a container sunk in the soil, a large proportion of ground dwelling beetle species occurring in a habitat will not be detected with sufficient certainty as they are comparatively rare in assemblages ( Driscoll, 2010). However, the authors did not consider additions to pitfall trap designs such as extended rim plates or guidance barriers although these have been used in previous studies. A recent meta-analysis by Brown & Matthews (2016) discussed many pitfall trap parameters (diameter, depth, colour, rain covers, preservatives and the use of funnels) and even proposed a standardized trap design. Although the limitations of pitfall traps in respect to trait filtering and reflecting diversity and abundances in a habitat appropriately have been intensively discussed, the method is still the best standardized and comparable approach to study ground dwelling arthropods and due to comparative low handling time allows for sufficient replication ( Driscoll, 2010 Kotze et al., 2011).ĭifferent features of pitfall trap designs have undergone review and research over the last decades in order to improve and standardize trap designs: colour of traps ( Buchholz et al., 2010), the presence and colour of rain covers ( Buchholz & Hannig, 2009 Csázár et al., 2018), sampling intervals ( Schirmel et al., 2010), spatial distribution ( Ward, New & Yen, 2001), different preservatives ( Schmidt et al., 2006 Skvarla, Larson & Dowling, 2014) as well as pitfall trap diameters and the use of funnels ( Csázár et al., 2018 Lange, Gossner & Weisser, 2011). Proposed nearly a century ago, pitfall traps remain one of the most commonly applied sampling methods in ecological field studies and are widely used for the assessment of ground dwelling arthropod taxa which are of high importance in modern ecosystem functioning research ( Brown & Matthews, 2016). In comprehensive biodiversity inventories, a smaller number of pitfall traps with guidance barriers and a larger number of spatial replicates is of advantage, while due to comparability reasons, the use of simple pitfall traps will be recommended in most other cases. Discussionĭue to the obvious trait filtering and resulting altered assemblages, we suggest not to use pitfall traps with extended plastic rim plates. Pitfall traps with extended plastic rim plates did not only perform poorly but also resulted in distinct carabid assemblages with less individuals of small species and a larger variation. Pitfall traps with guidance barriers were up to five times more effective than simple pitfall traps and trap samples resulted in more similar assemblage approximations. About 20 traps were active for 10 weeks and emptied biweekly resulting in 100 trap samples. We tested four pitfall trap types which have been used in previous studies for their effectiveness: a simple type, a faster exchangeable type with an extended plastic rim plate and two types with guidance barriers (V- and X-shaped). The effects of different pitfall trap designs on the trapping outcome are poorly investigated however they might affect conclusions drawn from pitfall trap data greatly. Pitfall traps are commonly used to assess ground dwelling arthropod communities. It’s a matter of design-how pitfall trap design affects trap samples and possible predictions. Cite this article Boetzl FA, Ries E, Schneider G, Krauss J. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited. Licence This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. 2 Regierungspräsidium Karlsruhe, Referat 56-Naturschutz und Landschaftspflege, Karlsruhe, Germany DOI 10.7717/peerj.5078 Published Accepted Received Academic Editor Joseph Gillespie Subject Areas Agricultural Science, Conservation Biology, Ecology, Entomology Keywords Biodiversity estimation, Spiders, Carabid beetles, Ground dwelling predators, Staphylinid beetles, Sampling method, Inventory, Species richness Copyright © 2018 Boetzl et al.
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