Studies on sex-chromosome turnover and evolution of secondary sexual characteristics in the family Adrianichthyidae

2017 Fiscal Year Final Research Report

• Project/Area Number: 26291093
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Ecology/Environment
• Research Institution: University of the Ryukyus
• Principal Investigator: YAMAHIRA Kazunori 琉球大学, 熱帯生物圏研究センター, 教授 (20322589)
• Co-Investigator(Kenkyū-buntansha): 北野 潤 国立遺伝学研究所, 集団遺伝研究系, 教授 (80346105)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 進化 / 生態 / 性淘汰 / スラウェシ

Outline of Final Research Achievements

In this study, we tested the possibility that sex-chromosome turnover led to rapid evolution of secondary sexual characteristics in medaka fishes in Sulawesi Island. Analyses of population structures and sex-determination systems using sex-linked markers revealed that the Malili medaka species complex diverged into six populations while being mixed with each other by a certain degree of gene flows, and that sex-determination systems are polytypic with sex-chromosome turnovers among the species/populations. QTL mapping using an inter-specific cross line revealed that male-specific fin reddishness of the Muna medaka species complex is regulated by an autosomal gene, but that multiple loci may be involved in male-specific body blueness.

Free Research Field

進化生態学