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Protogynous hermaphroditism in Crustacea : a new example from Tanaidacea
| Title: | Protogynous hermaphroditism in Crustacea : a new example from Tanaidacea |
| Authors: | Kakui, Keiichi Browse this author →KAKEN DB | | Hiruta, Chizue Browse this author →KAKEN DB |
| Keywords: | Malacostraca | | Nesotanais sp. aff. ryukyuensis | | Pancrustacea | | Peracarida | | sequential hermaphroditism | | sex change | | tanaids |
| Issue Date: | 2022 |
| Publisher: | NRC Research Press (Canadian Science Publishing) |
| Journal Title: | Canadian Journal of Zoology |
| Volume: | 100 |
| Issue: | 8 |
| Start Page: | 481 |
| End Page: | 487 |
| Publisher DOI: | 10.1139/cjz-2022-0033 |
| Abstract: | Hermaphroditism has been widely reported in the Crustacea, but protogyny, in which females change to males, is apparently rare and restricted to the peracarid orders Isopoda and Tanaidacea. In the latter, protogyny has been demonstrated in only seven species representing six genera by rearing experiments and indicated for several other genera and species through morphology. Here, we show through rearing experiment and histological observations, protogynous hermaphroditism in the tanaidacean species Nesotanais sp. aff. ryukyuensis Kakui, Kajihara and Mawatari, 2010. Our rearing experiment and size distribution data for wild individuals showed that females can change sex at various sizes (= ages). We found one individual identified externally as a female containing both ovaries and testes, indicating that overt female individuals undergo a short transitional phase as simultaneous hermaphrodites before the sex-change molt. We discuss the relationship among the wide size distribution of sex-changing females, the short life span of males, and the tube-dwelling mode of life. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/86587 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 角井 敬知
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