Phylogeography of the Mauremys mutica complex and the implications for
conservation management.
Abstract
For more than three decades, the Asian turtle crisis has resulted in the
decline of every native species in China. For some species, such as the
yellow pond turtle (Mauremys mutica), wild populations have dwindled to
near functional extinction. Previous studies show there is deep genetic
divergence of M. mutica sensu lato between populations north and south
of the Pearl River Drainage but no data to show if phylogeographic
structure occurs within these two main types. In this study, we found
clear phylogeographic structure. In northern types, we found two main
clades, corresponding to mainland China and island clades (Taiwan and
Yaeyema Islands) with uncorrected p values of 0.00-2.0% divergence in
our 2353 bp concatenated mtDNA data set. For the southern types, we
found three main clades corresponding to Hainan, Mainland
(Vietnam/Guangxi) and the Annam pond turtle (Mauremys annamensis) with
divergence ranging from 1.0-1.8% among these three groups. Moreover,
the identification of northern and southern types by phenotype was
roughly 98% accurate, which, coupling with the deep genetic divergence
in mtDNA (5.5-6.7%) and in the 6056 bp nuDNA data set (0.16-0.37%)
provide sufficient evidence for northern M. mutica to be an independent
species, and individuals from the southern clade should be regarded as
subspecies of M. annamensis. Finally, we provide the most comprehensive
database to date which can be used to determine the region of origin for
captive stock. Making the large captive populations of M. mutica, under
the right conditions, potentially valuable for restocking or
augmentation of wild populations.