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Evaluating the application of scale frequency to estimate the size of pangolin scale seizures

Ullmann, Tessa, Veríssimo, Diogo, Challender, Daniel W.S. (2019) Evaluating the application of scale frequency to estimate the size of pangolin scale seizures. Global Ecology and Conservation, 20 . ISSN 2351-9894. (doi:10.1016/j.gecco.2019.e00776) (KAR id:77341)


All eight species of pangolin are principally threatened by overexploitation, both for international trafficking and local use. Much illegal trade involves scales, but there is an absence of robust conversion parameters for estimating the number of different pangolin species in given seizures. Such parameters are critical in order to accurately characterize pangolin trafficking and understand the magnitude and impact of exploitation on populations. In this study, we calculated the number of scales on 66 museum specimens representing all eight extant pangolin species from the genera Manis, Phataginus, and Smutsia, and developed a method for estimating the number of pangolins in given seizures of scales based on scale frequency. Our statistical analyses found significant variation in scale number in inter-species terms (ranging from 382 for Temminck's ground pangolin to 940 for the Philippine pangolin), and in intra-species terms, with substantial variation in the giant pangolin (509–664 scales) and minimal variation in the Chinese pangolin (527–581 scales). We discuss application of the developed sampling method in a real world context and critically appraise it against existing methods. The knowledge generated in this study should assist in understanding pangolin trafficking dynamics, though there remains a need for accurate conversion parameters for estimating the number of pangolins in illegal trade, especially for the Indian and African species.

Item Type: Article
DOI/Identification number: 10.1016/j.gecco.2019.e00776
Uncontrolled keywords: CITES, Enforcement, Illegal wildlife trade, Manidae Phataginus, Smutsia
Divisions: Divisions > Division of Human and Social Sciences > School of Anthropology and Conservation > DICE (Durrell Institute of Conservation and Ecology)
Depositing User: Paul Crame
Date Deposited: 11 Oct 2019 14:46 UTC
Last Modified: 04 Mar 2024 19:44 UTC
Resource URI: (The current URI for this page, for reference purposes)

University of Kent Author Information

Ullmann, Tessa.

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