1993 Fiscal Year Annual Research Report

さんご礁動物の生殖と加入戦略の地理的変異の機構に関する研究

Research Project

Project/Area Number	04045045
Research Institution	University of the Ryukyus
Principal Investigator	山里清琉球大学, 理学部, 教授 (80044973)
Co-Investigator(Kenkyū-buntansha)	LACSON John グアム大, 海洋実験所, 助教授 NELSON Steph グアム大, 海洋実験所, 教授 BIRKELAND Ch グアム大, 海洋実験所, 教授 RICHMOND Rob グアム大, 海洋実験所, 教授竹村明洋琉球大学, 熱帯海洋科学センター, 助手 (40222103) 高野和則琉球大学, 熱帯海洋科学センター, 教授 (30001605) 日高道雄琉球大学, 理学部, 助教授 (00128498) 香村真徳琉球大学, 理学部, 教授 (90044982) 上原剛琉球大学, 理学部, 教授 (20045016)
Keywords	サンゴ / ウニ類 / 魚類 / 生殖周期 / 地理的変異 / 種間・種内変異 / 水質汚濁 / 加入戦略
Research Abstract	沖縄産ヤサイサンゴ科3種について、冬期の生殖を調べた結果、ショウガサンゴはこれまで同様9〜3月まで全くプラヌラの放出がないことを再確認し、ハナヤサイサンゴは9〜1月までプラヌラを放出し、2〜3月は放出がなかった。しかし実験的に海水温を25〜27℃に上げて飼育したものでは放出が見られた。このことから水温とプラヌラ放出が深くかかわっていることが明らかになった(山里)。電気泳動法により、アザミサンゴ本体と共生藻の酸素を分離識別した後、いくつかの色彩変異型について18酵素のうち8酵素で解釈可能なバンドが得られ、12群体中1個体において多型がえられた(日高)。両地域のガンガゼモドキを詳細に比較したところ、殻のサイズ、棘の形態、生息環境に差が見られ別種の可能性が高い。トックリガンガゼモドキもグアムで採集し沖縄のものと比較検討中である(上原)。沖縄でハナアイゴ成魚を周年飼育し、生殖腺重量及び卵巣組織の変化から繁殖期が5〜7月であることが明らかになった。また新月の前に産卵する月周性のリズムを持つことがわかった(高野、竹村)。またグアム産とは繁殖期が異なることが示唆された(竹村)。グアムにおいて動物と藻類の相互関係についての基礎調査を実施した。特に両地域の干満と水温の差が動物と藻類の生活様式に深くかかわっていることが示唆された(香村)。沖縄に招へいされたリッチモンドは、両地域の水質汚濁等の環境条件と各種サンゴの受精・発生との関係を継続して研究した。ネルソンは、両地域のアイゴ属4種の個体を採集し、種間・種内変異について検討中である。また両地域のルリスズメの遺伝的変異について生化学的手法で調べた結果、大きな差があり別種の可能性が極めて高い(ラクソン,ネルソン)。バ-クランドは、サンゴ幼生の加入に及ぼす環境調査を現地で実施した。

Research Products
(14 results)

All Other

All Publications (14 results)

[Publications] K.Yamazato,M.Sai,and Y.Nakano: "Sexual reproduction of Okinawan corals,Stylophora pistillata(Esper)and Seriatopora hystrix Dana." Proceedings of the 7th International Coral Reef Symposium. (in press). (1994)
[Publications] Y.Nakano,K.Yamazato,and S.Iso: "Responses of Okinawan reef-building corals to experimental high salinity." Proceedings of the 7th International Coral Reef Symposium. (in press). (1994)
[Publications] P.W.Glynn,R.Imai,K.Sakai,Y.Nakano,and K.Yamazato: "Experimental responses of Okinawan(Ryukyu Islands,Japan)reef corals to high sea temperature and UV radiation." Proceedings of the 7th International Coral Reef Symposium. (in press). (1994)
[Publications] M.Hidaka: "Growth rate and surface structure of skeletons of the coral Galaxea fascicularis kept in darkness for various lengths of time." Proceedings of the 7th International Coral Reef Symposium. (in press). (1994)
[Publications] T.Uehara: "Morphological variation of the sea urchin,Echinothrix diadema,from Okinawa and Guam." 8th international Echinoderm Conference(Dijon/6-10 September 1993). (in press). (1994)
[Publications] S.Kinjo and T.Uehara: "On the connective rods of pluteus larvae in hybrids among Echinometra species from Okinawa." 8th international Echinoderm Conference(Dijon/6-10 September 1993). (in press). (1994)
[Publications] K.Fukuchi and T.Uehara: "Hybridization between species of sea urchin,Toxopneusteus elegans and Toxopneustes pileolus." 8th international Echinoderm Conference(Dijon/6-10 September 1993). (in press). (1994)
[Publications] A.Takemura,C,-Y.Choi & K.Takano: "Ovarian development and changes in vitellogenesis during the annual reproductive cycle of female fusilier,Caesio diagramma." International Symposium of the University of the Ryukyus on BIODIVERSITY AND ADAPTIVE STRATEGIES OF CORAL REEF ORGANISMS (Okinawa/22-24 November 1992). (in press). (1994)
[Publications] R.H.Richmond: "Coral reefs:present problems and future concerns resulting from anthropogenic disturbance." Amer.Zool.33. (1993)
[Publications] R.H.Richmond: "Coral reef resources;pollution's inpacts." Forum for Applied Research and Public Policy. (in press). (1993)
[Publications] R.H.Richmond: "Effects of corstal runoff on coral reproduction." In Global Aspects of Coral Reef;Hazards and History.42-46 (1993)
[Publications] R.H.Richmond: "The reproductive Biology of corals:comparisons between Okinawa and Guam." International Symposium of the University of the Ryukyus on BIODIVERSITY AND ADAPTIVE STRATEGIES OF CORAL REEF ORGANISMS (Okinawa/22-24 November 1992).(1994)
[Publications] C.Birkeland: "Why some species are espeially influenced on coral-reef communities and others are not." International Symposium of the University of the Ryukyus on BIODIVERSITY AND ADAPTIVESTRATEGIES OF CORAL REEF ORGANISMS(Okinawa/22-24 November 1992). (in press). (1994)
[Publications] J.M.Lacson: "Fixed allele frequency difference among Palauan and Okinawan populations of the damselfishes Chrysiptera cyanea and Pomacentrus coelestis" Marine Biology. (in press). (1993)

1993 Fiscal Year Annual Research Report

さんご礁動物の生殖と加入戦略の地理的変異の機構に関する研究

Principal Investigator

山里 清 琉球大学, 理学部, 教授 (80044973)

Research Products

[Publications] K.Yamazato,M.Sai,and Y.Nakano: "Sexual reproduction of Okinawan corals,Stylophora pistillata(Esper)and Seriatopora hystrix Dana." Proceedings of the 7th International Coral Reef Symposium. (in press). (1994)

[Publications] Y.Nakano,K.Yamazato,and S.Iso: "Responses of Okinawan reef-building corals to experimental high salinity." Proceedings of the 7th International Coral Reef Symposium. (in press). (1994)

[Publications] P.W.Glynn,R.Imai,K.Sakai,Y.Nakano,and K.Yamazato: "Experimental responses of Okinawan(Ryukyu Islands,Japan)reef corals to high sea temperature and UV radiation." Proceedings of the 7th International Coral Reef Symposium. (in press). (1994)

[Publications] M.Hidaka: "Growth rate and surface structure of skeletons of the coral Galaxea fascicularis kept in darkness for various lengths of time." Proceedings of the 7th International Coral Reef Symposium. (in press). (1994)

[Publications] T.Uehara: "Morphological variation of the sea urchin,Echinothrix diadema,from Okinawa and Guam." 8th international Echinoderm Conference(Dijon/6-10 September 1993). (in press). (1994)

[Publications] S.Kinjo and T.Uehara: "On the connective rods of pluteus larvae in hybrids among Echinometra species from Okinawa." 8th international Echinoderm Conference(Dijon/6-10 September 1993). (in press). (1994)

[Publications] K.Fukuchi and T.Uehara: "Hybridization between species of sea urchin,Toxopneusteus elegans and Toxopneustes pileolus." 8th international Echinoderm Conference(Dijon/6-10 September 1993). (in press). (1994)

[Publications] R.H.Richmond: "Coral reefs:present problems and future concerns resulting from anthropogenic disturbance." Amer.Zool.33. (1993)

[Publications] R.H.Richmond: "Coral reef resources;pollution's inpacts." Forum for Applied Research and Public Policy. (in press). (1993)

[Publications] R.H.Richmond: "Effects of corstal runoff on coral reproduction." In Global Aspects of Coral Reef;Hazards and History.42-46 (1993)

[Publications] R.H.Richmond: "The reproductive Biology of corals:comparisons between Okinawa and Guam." International Symposium of the University of the Ryukyus on BIODIVERSITY AND ADAPTIVE STRATEGIES OF CORAL REEF ORGANISMS (Okinawa/22-24 November 1992).(1994)

[Publications] C.Birkeland: "Why some species are espeially influenced on coral-reef communities and others are not." International Symposium of the University of the Ryukyus on BIODIVERSITY AND ADAPTIVESTRATEGIES OF CORAL REEF ORGANISMS(Okinawa/22-24 November 1992). (in press). (1994)

[Publications] J.M.Lacson: "Fixed allele frequency difference among Palauan and Okinawan populations of the damselfishes Chrysiptera cyanea and Pomacentrus coelestis" Marine Biology. (in press). (1993)

山里清琉球大学, 理学部, 教授 (80044973)