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Camera trap placement and the potential for bias due to trails and other features

Show simple item record Kolowski, Joseph M. Forrester, Tavis D. 2019-02-15T18:29:38Z 2019-02-15T18:29:38Z 2017-10
dc.identifier.issn 1932-6203
dc.description.abstract Camera trapping has become an increasingly widespread tool for wildlife ecologists, with large numbers of studies relying on photo capture rates or presence/absence information. It is increasingly clear that camera placement can directly impact this kind of data, yet these biases are poorly understood. We used a paired camera design to investigate the effect of small-scale habitat features on species richness estimates, and capture rate and detection probability of several mammal species in the Shenandoah Valley of Virginia, USA. Cameras were deployed at either log features or on game trails with a paired camera at a nearby random location. Overall capture rates were significantly higher at trail and log cameras compared to their paired random cameras, and some species showed capture rates as much as 9.7 times greater at feature-based cameras. We recorded more species at both log (17) and trail features (15) than at their paired control cameras (13 and 12 species, respectively), yet richness estimates were indistinguishable after 659 and 385 camera nights of survey effort, respectively. We detected significant increases (ranging from 11–33%) in detection probability for five species resulting from the presence of game trails. For six species detection probability was also influenced by the presence of a log feature. This bias was most pronounced for the three rodents investigated, where in all cases detection probability was substantially higher (24.9–38.2%) at log cameras. Our results indicate that small-scale factors, including the presence of game trails and other features, can have significant impacts on species detection when camera traps are employed. Significant biases may result if the presence and quality of these features are not documented and either incorporated into analytical procedures, or controlled for in study design.
dc.language.iso en_US en_US
dc.publisher PLoS ONE en_US
dc.rights Attribution 3.0 United States *
dc.rights.uri *
dc.title Camera trap placement and the potential for bias due to trails and other features en_US
dc.type Article en_US
dc.identifier.doi 10.1371/journal.pone.0186679

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