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Social Behavior

開催日 2014/9/12
時間 11:00 - 12:00
会場 Poster / Exhibition(Event Hall B)

Analysis of neural/molecular mechanisms of mate-guarding behavior in small fish, medaka

  • P2-273
  • 横井 佐織 / Saori Yokoi:1 奥山 輝大 / Teruhiro Okuyama:1 亀井 保博 / Yasuhiro Kamei:2 谷口 善仁 / Yoshihito Taniguchi:3 安齋 賢 / Satoshi Ansai:4 木下 政人 / Masato Kinoshita:4 久保 健雄 / Takeo Kubo:1 竹内 秀明 / Hideaki Takeuchi:1 
  • 1:東京大院理生物科学 / Div. of Biol. Science, Grad. Sch. of Science, Univ. of Tokyo 2:基礎生物学研究所 / National Institute for Basic Biology, Aichi, Japan 3:慶応大医公衆衛生 / Department of Preventive Medicine and Public Health, School of Medicine, Keio University, Tokyo, Japan 4:京都大院農応用科学 / Division of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan 

In various animal species ranging from insects to vertebrates, males exhibit mate-guarding behavior to prevent other males from mating with their potential or former mates. Although mate-guarding behavior has been studied extensively in the field of behavioral ecology, the underlying neural/ molecular basis remains largely unknown. Here we report that medaka fish (Oryzias latipes), a model animal for molecular genetics, exhibits mate-guarding behavior. We found that, when one female and two males were placed in a single tank, the two males competed each other for the female and, the dominant male prominently approached the female and interrupted the other subordinate male (mate-guarding behavior). The dominant male had significantly higher mating success rate than the other subdominant male. Interestingly medaka males exhibit this behavior, irrespective of mating period. Next we show that the long-lasting mate-guarding led to high mating success of the dominant male via female preference, where female medaka tend to choose familiar (visually learned) males rather than unfamiliar males as mating partners (Okuyama et al. Science, 2014). It strongly suggested that medaka female actively choose the dominant male, that can prominently approached and become familiar with the female. Finally, to analyze the neural basis of mate-guarding behavior, we generated several medaka mutants by Tilling method and identified some mutant strains with defect in the behaviors.

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