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Scat DNA reveals distinct lineage of Chinese pangolin in Nepal:
Implications for Conservation and Wildlife Forensics.
Abstract
Pangolins are under severe threat from illegal trade and habitat loss.
Despite their conservation significance, these elusive creatures remain
poorly understood, particularly in the context of phylogeography and
genetic diversity. In this study DNA was isolated from two types of
pangolin scat (faeces) samples (whole scat and swabs) which had been
stored frozen for up to 3 years between the time of collection and our
analyses. A mitochondrial sequence for the cytochrome b gene (424 bp)
region was reliably generated from both sample types, for scats which
appeared in ‘good’ or ‘poor’ condition at the time of collection. Sanger
sequencing revealed four new cytochrome b haplotypes for pangolin, with
variations in distinct sampling regions in Nepal (central and east).
Comparison to reference sequences for pangolin originating from China,
Taiwan and Thailand, indicated a distinct variant of Chinese pangolin in
Nepal (15-19 base pair difference). Genetic differentiation of Chinese
pangolin in Nepal has broader conservation significance for this
species. Methods described here are robust and could be applied to
broader genetic studies of pangolin populations across Nepal, allowing
for genetic mapping of pangolin variations to assist in identifying
populations of significance, evaluation of conservation interventions,
and forensic applications supporting the fight against illegal poaching.