Iris photo-identification: A new methodology for the individual recognition of Tarentola geckos

in Amphibia-Reptilia
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Gekkonid field studies are hampered by the difficulty to individually recognize individuals. In this study we assess the feasibility of using their variegated iris pattern to photo-identify Tarentola boettgeri bischoffi, a threatened Macaronesian endemic. Using a library of 924 photos taken over a 9-month period we also evaluate the use of the pattern matching software Interactive Individual Identification System (I3S) to match photos of known specimens. Individuals were clearly recognized by their iris pattern with no misidentifications, and using I3S lead to a correct identification of 95% of the recaptures in a shorter time than the same process when conducted visually by an observer. The method’s feasibility was improved by increasing the number of images of each animal in the library and hindered by photos that deviate from a horizontal angle.

Iris photo-identification: A new methodology for the individual recognition of Tarentola geckos

in Amphibia-Reptilia

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Figures

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    Tarentola boettgeri bischoffi head profile illustrating the unique variegated iris pattern. The vertical arrows correspond to the three reference points used in the I3S fingerprint and the horizontal arrows relate to the three types of iris features used for identification purposes: line interceptions, conspicuous vertices and dots.

  • View in gallery

    Head profiles of two Tarentola boettgeri bischoffi photographed between June 2009 and May 2011. Images (a) and (b) correspond respectively to the right and left profiles of an individual captured in June 2009, and images (c) and (d) to the same individual recaptured in April 2010. Images (e) and (f) correspond to the right profiles of a gecko captured in June 2009 and recaptured in May 2011.

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