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  1. 学位論文
  2. 修士論文
  3. 理学系
  1. 部局別インデックス
  2. 理工学研究科

Sexual Reproduction of Millepora intricata and Millepora tenella (Hydrozoa : Milleporidae)

http://hdl.handle.net/20.500.12000/5247
http://hdl.handle.net/20.500.12000/5247
7a38da57-5c45-4501-af0d-39d4aa7d9392
名前 / ファイル ライセンス アクション
Nomura_1998-6.pdf Nomura_1998-6.pdf
Nomura_1998-5.pdf Nomura_1998-5.pdf
Nomura_1998-4.pdf Nomura_1998-4.pdf
Nomura_1998-3.pdf Nomura_1998-3.pdf
Nomura_1998-2.pdf Nomura_1998-2.pdf
Nomura_1998-1.pdf Nomura_1998-1.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2021-12-15
タイトル
タイトル Sexual Reproduction of Millepora intricata and Millepora tenella (Hydrozoa : Milleporidae)
言語 en
作成者 Nomura, Junko

× Nomura, Junko

en Nomura, Junko

野村, 純子

× 野村, 純子

ja 野村, 純子

アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
内容記述
内容記述タイプ Other
内容記述 琉球大学大学院理学研究科 平成9年度 修士論文
内容記述タイプ Other
内容記述 A Thesis submitted to the Graduate School of the University of the Ryukyus in partial fulfilment of the requirements for the degree of Master of Science in Marine Sciences.
内容記述タイプ Other
内容記述 The hydrozoan coral Millepora develops medusa inside a receptacle called\nan 'ampulla' for sexual reproduction. Little attention has been paid to the\nsexual reproduction of Millepora compared to scleractinian corals. This\nstudy is aimed to trace the developmental processes of medusae and\nampullae throughout one year.\nRegular sampling of Millepora intricata and Millepora tenella was\nconducted for histological examination of the oogenesis and\nspermatogenesis between October 1996 and October 1997 at Sesoko\nIsland, Okinawa (26°38'N, 127°52'E). Medusae released from M.intricata at Mizugama, on the west coast of Okinawa Island, were also\nexamined.\nAmpullae were observed in M.intricata from May to July in 1997, M.tenella ampullae were observed only in May of the same year. In both\nM.intricata and M.tenella, it took approximately 25 days from the\nearliest developmental stage to mature medusa release. M.intricata seemed to release medusae in the last quarter of the lunar cycle. Simple\nmedusa indicates their incapability to catch prey. Nematocysts on the umbrella may be used for protecting gametes from predators, but are\nunlikely used to capture prey given such a short life-span.\nCoincidental developmental stages among the colonies of each species\nindicates synchronous medusae release. Synchronous release of medusae\namong colonies appears to be necessary in Millepora because short-lived\nmale and female medusae are released from separate colonies.
内容記述タイプ Other
内容記述 ヒドロサンゴであるミレポラ属は、有性生殖のために、アンプラと呼ばれる子嚢の中にクラゲを作る。イシサンゴ類の生殖に関する情報が大変増えてきたことに比べ、ミレポラ属の生殖に関してはほとんど知られていない。本研究ではクラゲとアンプラの発達を一年間通して観察した。\nMillepora intricataとMillepora tenellaの2種を、1996年10月から翌年の1997年10月にかけて、沖縄県瀬底島(26°38'N,127°52'E)において規則的にサンプリングし、組織学的研究によって卵形成と精子形成を観察した。また、沖縄県の西海岸に位置する水釜から採集したM.intricataから放出されたクラゲも調べた。\nアンプラはM.intricataでは1997年の5月から7月、M.tenellaでは同年の5月のみ観察された。M.intricataとM.tenellaの両種で、観察されたクラゲの発達の一番初期の段階から、クラゲの放出まで約25日間かかった。 M.intricataは下弦の月から、新月にかけてクラゲの放出をしているようだ。放出されたクラゲの単純な形態は、餌を捕る能力に欠けていることを示している。クラゲが持つたくさんの刺胞は、配偶子を敵から守るために役立つかも知れない。\nコロニー間で、クラゲの発達の段階が同調していることは、クラゲの放出が同時に起こっているであろうことを示している。雌雄異株のコロニーから短命のクラゲを放出するミレポラ属にとって、クラゲの放出をコロニー間で同時に行うことは、有性生殖の成功のためにも必要であろう。
内容記述タイプ Other
内容記述 学位論文
出版者
言語 ja
出版者 野村, 純子
言語
言語 eng
資源タイプ
資源タイプ other
資源タイプ識別子 http://purl.org/coar/resource_type/c_1843
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/5247
識別子タイプ HDL
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