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Spot the match - wildlife photo-identification using information theory

Speed, Conrad Wayne, Meekan, Mark G. and Bradshaw, Corey J. A. (2007). Spot the match - wildlife photo-identification using information theory. Frontiers in Zoology,4:1-11.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 47 times in Scopus Article | Citations
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IRMA ID A00006xPUB12
Title Spot the match - wildlife photo-identification using information theory
Author Speed, Conrad Wayne
Meekan, Mark G.
Bradshaw, Corey J. A.
Journal Name Frontiers in Zoology
Publication Date 2007
Volume Number 4
ISSN 1742-9994   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-33846479344
Start Page 1
End Page 11
Total Pages 11
Place of Publication St Louis, United States of America
Publisher BioMed Central Ltd
Field of Research 0608 - Zoology
HERDC Category C1 - Journal Article (DEST)
Abstract Background Effective approaches for the management and conservation of wildlife populations require a sound knowledge of population demographics, and this is often only possible through mark-recapture studies. We applied an automated spot-recognition program (I3S) for matching natural markings of wildlife that is based on a novel information-theoretic approach to incorporate matching uncertainty. Using a photo-identification database of whale sharks (Rhincodon typus) as an example case, the information criterion (IC) algorithm we developed resulted in a parsimonious ranking of potential matches of individuals in an image library. Automated matches were compared to manual-matching results to test the performance of the software and algorithm. Results Validation of matched and non-matched images provided a threshold IC weight (approximately 0.2) below which match certainty was not assured. Most images tested were assigned correctly; however, scores for the by-eye comparison were lower than expected, possibly due to the low sample size. The effect of increasing horizontal angle of sharks in images reduced matching likelihood considerably. There was a negative linear relationship between the number of matching spot pairs and matching score, but this relationship disappeared when using the IC algorithm. Conclusion The software and use of easily applied information-theoretic scores of match parsimony provide a reliable and freely available method for individual identification of wildlife, with wide applications and the potential to improve mark-recapture studies without resorting to invasive marking techniques.
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