| 要旨トップ | 目次 | 日本生態学会第70回全国大会 (2023年3月、仙台) 講演要旨
ESJ70 Abstract


一般講演(口頭発表) G02-01  (Oral presentation)

同所的なメダカ属魚類間における表現型分化の遺伝基盤とゲノム分化【B】
Genetic architecture of phenotypic differentiation and genomic pattern of divergence between sympatric species of ricefish【B】

*柿岡諒(琉球大学), 安齋賢(東北大学), 田中理映子(東山動植物園), 佐藤正祐(東山動植物園), 北野潤(遺伝研), 木村亮介(琉球大学), 山平寿智(琉球大学)
*Ryo KAKIOKA(Univ. Ryukyus), Satoshi ANSAI(Tohoku Univ.), Rieko TANAKA(Higashiyama Zoo Bot. Gard.), Masahiro SATO(Higashiyama Zoo Bot. Gard.), Jun KITANO(Natl Inst. Genet.), Ryosuke KIMURA(Univ. Ryukyus), Kazunori YAMAHIRA(Univ. Ryukyus)

The ricefishes are highly diversified on the Indonesian island of Sulawesi. The scarcity of competing freshwater fish taxa because of the geological isolation may have offered ecological opportunities to ricefishes. Three species of Oryzias ricefish are distributed in Lake Poso, a Sulawesian ancient lake. They are inferred to have speciated in sympatry within the lake. The ecological and reproductive traits divergent between the species could have contributed to the reproductive isolation. Historical introgression from another species in a separate lake is also suggested. However, the genetic bases and evolutionary mechanisms of Lake Poso ricefish speciation remain unknown, including the evolutionary sources of the genetic variation that enabled the speciation. We conduct population genomic and quantitative genetic analyses to reveal the evolutionary mechanisms of ricefish sympatric speciation. We report the genomic divergence and gene flow between the ricefishes and discuss historical introgression between the species that fuelled the genetic variation of the populations and possible traces of natural selection that acted on the species. We also conduct quantitative trait locus analyses to identify genomic regions related to the phenotypic differences between the species, the evolution of which may have been the requisite for the speciation.


日本生態学会