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Population Genetic Structure Reveals Two Lineages of Amynthas triastriatus (Oligochaeta: Megascolecidae) in China, with Notes on a New Subspecies of Amynthas triastriatus

Author

Listed:
  • Yan Dong

    (School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
    Key Laboratory of Urban Agriculture (South), Ministry of Agriculture, Shanghai 200240, China)

  • Jibao Jiang

    (School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
    Key Laboratory of Urban Agriculture (South), Ministry of Agriculture, Shanghai 200240, China)

  • Zhu Yuan

    (School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
    Key Laboratory of Urban Agriculture (South), Ministry of Agriculture, Shanghai 200240, China)

  • Qi Zhao

    (School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
    Key Laboratory of Urban Agriculture (South), Ministry of Agriculture, Shanghai 200240, China)

  • Jiangping Qiu

    (School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China
    Key Laboratory of Urban Agriculture (South), Ministry of Agriculture, Shanghai 200240, China)

Abstract

Amynthas triastriatus (Oligochaete: Megascolecidae) is a widely distributed endemic species in Southern China. To shed light on the population genetic diversity and to elucidate the population differentiation and dispersal of A. triastriatus , a population genetic structure study was undertaken based on samples from 35 locations collected from 2010 to 2016. Two exclusive lineages within A. triastriatus —lineage A and lineage B—were revealed. Lineage A was mainly distributed at high altitudes while lineage B was mainly distributed at low altitudes in Southeast China. The genetic diversity indices indicated that the populations of A. triastriatus had a strong genetic structure and distinct dispersal histories underlying the haplogroups observed in this study. Combined with morphological differences, these results indicated a new cryptic subspecies of A. triastriatus . Lineage A was almost degenerated to parthenogenesis and lineage B had a trend to parthenogenesis, which suggested that parthenogenesis could be an internal factor that influenced the differentiation and dispersal of A. triastriatus . The divergence time estimates showed that A. triastriatus originated around Guangxi and Guangdong provinces and generated into two main lineages 2.97 Ma (95%: 2.17–3.15 Ma) at the time of Quaternary glaciation (2.58 Ma), which suggested that the Quaternary glaciation may have been one of main factors that promoted the colonization of A. triastriatus .

Suggested Citation

  • Yan Dong & Jibao Jiang & Zhu Yuan & Qi Zhao & Jiangping Qiu, 2020. "Population Genetic Structure Reveals Two Lineages of Amynthas triastriatus (Oligochaeta: Megascolecidae) in China, with Notes on a New Subspecies of Amynthas triastriatus," IJERPH, MDPI, vol. 17(5), pages 1-25, February.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:5:p:1538-:d:325807
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