Observer differences in individual identification of feral cats from camera trap images
Article
Article Title | Observer differences in individual identification of feral cats from camera trap images |
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ERA Journal ID | 2836 |
Article Category | Article |
Authors | Sparkes, Jessica and Fleming, Peter J. S. |
Journal Title | Australian Mammalogy |
Journal Citation | 45 (1), pp. 32-40 |
Number of Pages | 9 |
Year | 2022 |
Publisher | CSIRO Publishing |
Place of Publication | Australia |
ISSN | 0310-0049 |
1836-7402 | |
Digital Object Identifier (DOI) | https://doi.org/10.1071/AM21030 |
Web Address (URL) | https://www.publish.csiro.au/AM/AM21030 |
Abstract | Feral cats are a key threat to many Australian native fauna, with camera traps increasingly used to identify individuals for evaluation of management actions. However, observer bias and camera trap settings can affect individual identification rates. We compared feral cat individual identification by two observers with extremes of experience. Arrays of 39–50 camera traps were deployed continuously for 22 months at four sites in the Western Division of New South Wales. Where possible, feral cats were individually identified from phenotypic characteristics by an expert and naïve lay observer. We obtained 10 465 feral cat images, with 72 cats individually identified across the sites. The experienced observer attributed more feral cat events to a known individual compared with the lay observer (21.3 vs 12.9%, respectively). Forty three percent of cat images were similarly tagged by both observers. Daytime events yielded higher identification rates and match success (28.1 vs 19.5 and 17.9 vs 11.8% for day vs night events for the expert and lay observer, respectively). Lack of congruence between observers, combined with a small number of events where cats could be individually identified, and differences in identification accuracy over time and between sites, makes estimation of detection probabilities and errors difficult. |
Keywords | citizen science; Reconyx; population estimates; monitoring pelag; pest animal; management; Felis catus; conservation |
Contains Sensitive Content | Does not contain sensitive content |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Department of Primary Industries, New South Wales |
University of New England | |
Centre for Sustainable Agricultural Systems |
https://research.usq.edu.au/item/z02vv/observer-differences-in-individual-identification-of-feral-cats-from-camera-trap-images
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