Breeding season and early developmental stage of a urchin, Sterechinus neumayeri (Meissner), at Syowa Station, Antarctica

The breeding season and early developmental stage of a sea urchin, Sterechinus neumayeri, which is widely distributed in Antarctic coastal waters, were studied. A year-round sampling of the urchin was carried out at Syowa Station during the 40th Japanese Antarctic Research Expedition (JARE-40) over-...

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Main Authors: Yasutaka Tsuchiya, Sakae Kudoh, Katsufumi Sato, Mitsuo Fukuchi
Format: Article in Journal/Newspaper
Language:English
Japanese
Published: National Institute of Polar Research 2001
Subjects:
Online Access:https://doi.org/10.15094/00009164
https://doaj.org/article/8b6d4f9a218e45058b2d48cf1da93f3b
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spelling ftdoajarticles:oai:doaj.org/article:8b6d4f9a218e45058b2d48cf1da93f3b 2023-05-15T13:57:41+02:00 Breeding season and early developmental stage of a urchin, Sterechinus neumayeri (Meissner), at Syowa Station, Antarctica Yasutaka Tsuchiya Sakae Kudoh Katsufumi Sato Mitsuo Fukuchi 2001-07-01T00:00:00Z https://doi.org/10.15094/00009164 https://doaj.org/article/8b6d4f9a218e45058b2d48cf1da93f3b EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00009164 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00009164 0085-7289 2432-079X https://doaj.org/article/8b6d4f9a218e45058b2d48cf1da93f3b Antarctic Record, Vol 45, Iss 2, Pp 157-170 (2001) Geography (General) G1-922 article 2001 ftdoajarticles https://doi.org/10.15094/00009164 2022-12-30T21:47:05Z The breeding season and early developmental stage of a sea urchin, Sterechinus neumayeri, which is widely distributed in Antarctic coastal waters, were studied. A year-round sampling of the urchin was carried out at Syowa Station during the 40th Japanese Antarctic Research Expedition (JARE-40) over-wintering period (February 1999-February 2000) using bait traps. The urchin entered into traps in both the autumn to mid-winter and late spring to summer periods, but not from late winter to early spring. According to the observed facts, that all individuals caught before mid-winter had mature sexual organs and that more than half of the collected urchins during late spring were post-spawning individuals, natural spawning seemed to occur from late winter to spring at the study site. In nearly freezing seawater, spawning and fertilization were experimentally induced using samples collected both in late autumn and late spring. The early development of the embryo was successfully observed for a month using the latter samples. The first cleavage occurred within 20 hours after insemination, and the successive development of the embryo reached the morula and blastula stages for 2 and 3 days, respectively. The embryo grew slowly and finally developed to a prism larva via the gastrula stage within 18 days after fertilization. Article in Journal/Newspaper Antarc* Antarctic Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic Syowa Station
institution Open Polar
collection Directory of Open Access Journals: DOAJ Articles
op_collection_id ftdoajarticles
language English
Japanese
topic Geography (General)
G1-922
spellingShingle Geography (General)
G1-922
Yasutaka Tsuchiya
Sakae Kudoh
Katsufumi Sato
Mitsuo Fukuchi
Breeding season and early developmental stage of a urchin, Sterechinus neumayeri (Meissner), at Syowa Station, Antarctica
topic_facet Geography (General)
G1-922
description The breeding season and early developmental stage of a sea urchin, Sterechinus neumayeri, which is widely distributed in Antarctic coastal waters, were studied. A year-round sampling of the urchin was carried out at Syowa Station during the 40th Japanese Antarctic Research Expedition (JARE-40) over-wintering period (February 1999-February 2000) using bait traps. The urchin entered into traps in both the autumn to mid-winter and late spring to summer periods, but not from late winter to early spring. According to the observed facts, that all individuals caught before mid-winter had mature sexual organs and that more than half of the collected urchins during late spring were post-spawning individuals, natural spawning seemed to occur from late winter to spring at the study site. In nearly freezing seawater, spawning and fertilization were experimentally induced using samples collected both in late autumn and late spring. The early development of the embryo was successfully observed for a month using the latter samples. The first cleavage occurred within 20 hours after insemination, and the successive development of the embryo reached the morula and blastula stages for 2 and 3 days, respectively. The embryo grew slowly and finally developed to a prism larva via the gastrula stage within 18 days after fertilization.
format Article in Journal/Newspaper
author Yasutaka Tsuchiya
Sakae Kudoh
Katsufumi Sato
Mitsuo Fukuchi
author_facet Yasutaka Tsuchiya
Sakae Kudoh
Katsufumi Sato
Mitsuo Fukuchi
author_sort Yasutaka Tsuchiya
title Breeding season and early developmental stage of a urchin, Sterechinus neumayeri (Meissner), at Syowa Station, Antarctica
title_short Breeding season and early developmental stage of a urchin, Sterechinus neumayeri (Meissner), at Syowa Station, Antarctica
title_full Breeding season and early developmental stage of a urchin, Sterechinus neumayeri (Meissner), at Syowa Station, Antarctica
title_fullStr Breeding season and early developmental stage of a urchin, Sterechinus neumayeri (Meissner), at Syowa Station, Antarctica
title_full_unstemmed Breeding season and early developmental stage of a urchin, Sterechinus neumayeri (Meissner), at Syowa Station, Antarctica
title_sort breeding season and early developmental stage of a urchin, sterechinus neumayeri (meissner), at syowa station, antarctica
publisher National Institute of Polar Research
publishDate 2001
url https://doi.org/10.15094/00009164
https://doaj.org/article/8b6d4f9a218e45058b2d48cf1da93f3b
geographic Antarctic
Syowa Station
geographic_facet Antarctic
Syowa Station
genre Antarc*
Antarctic
Antarctica
genre_facet Antarc*
Antarctic
Antarctica
op_source Antarctic Record, Vol 45, Iss 2, Pp 157-170 (2001)
op_relation http://doi.org/10.15094/00009164
https://doaj.org/toc/0085-7289
https://doaj.org/toc/2432-079X
doi:10.15094/00009164
0085-7289
2432-079X
https://doaj.org/article/8b6d4f9a218e45058b2d48cf1da93f3b
op_doi https://doi.org/10.15094/00009164
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