Variation in male courtship activeness between latitudinal populations of Northern medaka

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• 作者：Takeshi Sasaki ; Kazunori Yamahira
• 关键词：Latitude ; Mating behavior ; Oryzias sakaizumii
• 刊名：Ichthyological Research
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：63
• 期：2
• 页码：302-306
• 全文大小：489 KB
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• 作者单位：Takeshi Sasaki (1) (3)
  Kazunori Yamahira (2)
  
  1. Graduate School of Science and Technology, Niigata University, Niigata, 950-2181, Japan
  3. Kurosaki Hakudo Industries Co., Ltd., Shibata, Niigata, 957-0345, Japan
  2. Tropical Biosphere Research Center, University of the Ryukyus, Okinawa, 903-0213, Japan
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Zoology
  Ecology
  Animal Systematics/Taxonomy/ Biogeography
  Marine Ecology
  
• 出版者：Springer Japan
• ISSN：1616-3915

文摘

It has been demonstrated from free mating experiments using multiple males and females of the medaka, Oryzias latipes species complex, that lower-latitude males exhibit more active courtship behavior than higher-latitude males. In this study, courtship activeness in males from two latitudinal populations of Northern medaka, Oryzias sakaizumii, was measured in the presence of only one male and one female, where male–male interactions were completely eliminated. We found that males from the low-latitude population performed quick circles (i.e., courtship dance) and approached females more frequently than males from the high-latitude population. Moreover, the low-latitude males tended to start courtships sooner after encountering a female than the high-latitude males. Thus, the latitudinal variation in male courtship activeness persisted even in the absence of rival males. These probably reflect that sexual selection pressures are stronger at low latitudes.