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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
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Your Position :Home->Past Journals Catalog->2018 Vol.37 No.4

Taxonomical Status of Eremias arguta from Bole City and Ili River Valley, Xinjiang Uyghur Autonomous Region, China
Author of the article:GONG Xiong1,2, LIU Jinlong1,2, ZHOU Tianhe1,2, SONG Qi1,2, GUO Xianguang1*
Author's Workplace:1. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China
Key Words:Eremias arguta; Ili River Valley; intraspecies systematics; morphology; cytochrome b gene; molecular phylogeny
Abstract:The steppe racerunner (Eremias arguta) is one of the most widespread species of the Eurasian racerunners (genus Eremias), inhabiting steppes and semi-deserts of eastern Europe and central Asia from Romania to Mongolia and western China. Historically, 6 subspecies are recognized, and with 2 subspecies occurring in China; however, the taxonomical status of some subspecies is still controversial due in part to their high morphological variability. The present study deals with the intraspecies systematics of 28 samples representing 4 populations in Bole city and Ili River Valley, Xinjiang Uyghur Autonomous Region, China, through morphological comparison and phylogenetic analysis based on mitochondrial DNA cytochrome b (Cyt b) gene. Cyt b gene sequences of E. arguta available in the GenBank were compiled for comparison with the obtained haplotypes. Tree-based subspecies delimitation was achieved by using maximum parsimony, maximum likelihood and Bayesian phylogenetic analyses. Bayes factors (BF) were used to test the competing hypotheses for E. arguta by comparing the unconstrained Bayesian tree topology to Bayesian trees with ‘hard’ constraints. The morphological features of steppe racerunner population in Bole city matched the description of those from the Ili River Valley, with specific dorsal pattern characterized by the presence of bright blue or green ocelli in breeding males. Phylogenetic trees congruently indicated that the haplotypes from Bole city belong to the Ili River Valley clade, which represents a separate lineage with undescribed subspecies (E. arguta ssp.). The 3 hypotheses that populations from the Ili River Valley belong to the subspecies E. a. arguta, or E. a. potanini, or E. a. uzbekistanica were rejected with very strong evidence (2lnBF>10), respectively. The Ili River Valley clade is most likely the sister taxon to E. a. uzbekistanica and E. a. darevskii; meanwhile, there is no reliable evidence to reject the alternative hypothesis that E. arguta sister to the remaining lineages of E. a. arguta (2 < 2lnBF < 6). In addition, the reciprocal monophyly of E. a. potanini and E. a. arguta was recovered albeit with low bootstrap values and moderate Bayesian posterior probabilities. An alternative topology with samples of E. a. potanini nested within the E. a. arguta clade was not rejected with very strong evidence (6 < 2lnBF < 10). In conclusion, our results demonstrate that:(i) the steppe racerunner in Bole city is not E. a. potanini, but belongs to the Ili River Valley clade and thus represents a new record of E. arguta ssp. in Junggar Basin, Xinjiang, China; (ii) the populations from the Ili River Valley should not be classified as E. a. arguta or E. a. potanini or E. a. uzbekistanica, but belong to a cryptic clade (an undescribed subspecies); (iii) the phylogenetic placement of the novel clade (subspecies) is unclear and needing further clarification with integrative taxonomic approach. Finally, in combination with morphological variability, the validity of the E. a. potanini subspecies was discussed.
2018,37(4): 387-399 收稿日期:2018-01-07
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