loading page

Genetic responses in sexual diploid and asexual triploid goldfish (Carassius auratus) introduced into a high-altitude environment
  • +7
  • Xiu Feng,
  • Shenglin Liu,
  • Xiaoyun Sui,
  • Yifeng Chen,
  • Ren Zhu,
  • Yintao Jia,
  • Jingou Tong,
  • Xiaomu Yu,
  • Chunlong Liu,
  • Michael Hansen
Xiu Feng
Institute of Hydrobiology Chinese Academy of Sciences

Corresponding Author:fengxiu@ihb.ac.cn

Author Profile
Shenglin Liu
Aarhus University
Author Profile
Xiaoyun Sui
Institute of Hydrobiology Chinese Academy of Sciences
Author Profile
Yifeng Chen
Institute of Hydrobiology Chinese Academy of Sciences
Author Profile
Ren Zhu
Institute of Hydrobiology Chinese Academy of Sciences
Author Profile
Yintao Jia
Institute of Hydrobiology Chinese Academy of Sciences
Author Profile
Jingou Tong
Institute of Hydrobiology Chinese Academy of Sciences
Author Profile
Xiaomu Yu
Institute of Hydrobiology Chinese Academy of Sciences
Author Profile
Chunlong Liu
Institute of Hydrobiology Chinese Academy of Sciences
Author Profile
Michael Hansen
Aarhus University
Author Profile

Abstract

Anthropogenic biological invasions represent major concerns but enable us to investigate rapid evolutionary changes and adaptation to novel environments. The goldfish Carassius auratus with sexual diploids and asexual triploids coexisting in natural waters, is one of the most widespread invasive fishes in Tibet, providing an ideal model to study evolutionary processes during invasion in different reproductive forms from the same vertebrate. Here, using whole-genome resequencing data of 151 C. auratus individuals from invasive and native ranges, we found different patterns of genomic responses between diploid and triploid populations during their invasion to Tibet. For diploids, although invasive individuals derived from two different genetically distinct sources and had a relative higher diversity (π) at the population level, their individual genetic diversity (genome-wide observed heterozygosity) was significantly lower (21.4%) than that of source individuals. Population structure analysis revealed that the invasive individuals formed a specific genetic cluster distinct from the source populations. Runs of homozygosity analysis showed low inbreeding only in invasive individuals, and only the invasive population experienced a recent decline in effective population size reflecting founder events. For triploids, however, invasive populations showed no loss of individual genetic diversity and no genetic differentiation relative to source populations. Regions of putative selective sweeps between invasive and source populations of diploids mainly involved genes associated with mannosidase activity and embryo development. Our results suggest invasive diploids deriving from distinct sources still lost individual genetic diversity resulting from recent inbreeding and founder events and selective sweeps, and invasive triploids experienced no genetic change owing to their reproduction mode of gynogenesis that precludes inbreeding and founder effects and may make them more powerful invaders.
15 Nov 2022Submitted to Molecular Ecology
16 Nov 2022Submission Checks Completed
16 Nov 2022Assigned to Editor
16 Nov 2022Review(s) Completed, Editorial Evaluation Pending
21 Nov 2022Reviewer(s) Assigned
05 Jan 2023Editorial Decision: Revise Minor
20 Jan 2023Review(s) Completed, Editorial Evaluation Pending
20 Jan 20231st Revision Received
24 Jan 2023Editorial Decision: Accept