Random mating and protandrous sex change of the platycephalid fish Thysanophrys celebica (Platycephalidae)

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• 作者：Tomoki Sunobe ; Sachiko Sakaida ; Tetsuo Kuwamura
• 关键词：Hermaphrodite ; Protandry ; Random mating ; Platycephalidae ; Thysanophrys celebica
• 刊名：Journal of Ethology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：34
• 期：1
• 页码：15-21
• 全文大小：493 KB
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• 作者单位：Tomoki Sunobe (1)
  Sachiko Sakaida (1)
  Tetsuo Kuwamura (2)
  
  1. Laboratory of Fish Behavioral Ecology, Tateyama Station, Field Science Center, Tokyo University of Marine Science and Technology, 670 Banda, Tateyama, 294-0308, Japan
  2. School of International Liberal Studies, Chukyo University, Nagoya, 466-8666, Japan
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Zoology
  Behavioural Sciences
  Animal Ecology
  Evolutionary Biology
  Neurosciences
  
• 出版者：Springer Japan
• ISSN：1439-5444

文摘

The mating system and protandrous sex change of the platycephalid fish Thysanophrys celebica were examined by collection and observation in the field and by use of aquarium experiments. Male鈥揻emale pairs formed in the afternoon, and performed spawning behavior at night during the warmest season from July to early September. The pair bond was temporary, and both sexes subsequently changed partners. In pairs, the female was always larger than the male, although there were no significant size-assortative relationships between males and females in the pair. Home ranges of females and males overlapped, indicative of an absence of territoriality. Tagged individuals did not stay in the study area. These results indicate that random mating occurs for this species. Protandrous sex change of T. celebica was confirmed by field observation of a tagged individual and by aquarium experiments. Males (鈮?16 mm total length) changed sex at 2 years old, and females (鈮?7 mm) at 3鈥? years old. Because males changed sex even in the presence of larger females, sex change was not socially controlled. Consequently, reversed (female-to-male) sex change did not occur in aquarium experiments with rearing females only. For this species, it is suggested that random mating favors protandrous sex change at a fixed age and/or size, not depending on social status, as the original size-advantage model has predicted. Keywords Hermaphrodite Protandry Random mating Platycephalidae Thysanophrys celebica