STUDIES ON CONSERVATION OF LOCAL CORAL COMMUNITIES UNDER THE PROGRESSIVE GREEN HOUSE EFFECT

渐进温室效应下当地珊瑚群落的保护研究

基本信息

批准号：
12640619
负责人：
SAKAI Kazuhiko
金额：
$ 2.05万
依托单位：
UNIVERSITY OF THE RYUKYUS
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

1. Recovery of coral communities around Okinawa Island: Recovery processes of coral communities after mass coral bleaching occurred in 1998 were monitored at 10 stations established on coral reefs along mid-west coast of Okinawa Island. Settlement panels for coral larvae were set at each station, and settled corals were examined after collection. Survey of coral communities was also conducted at each station. There were very few mature Acropora colonies, but recruitment of Acropora was large at stations that are located near Kerama Islands. It is suggested that coral populations at Kerama Islands are the source of coral larvae for the recovery of coral communities in Okinawa Island.2. Population genetics of coral populations in the Ryukyu Archipelago: Gene flow of coral populations among Okinawa Is., Kerama Is., and Ishigaki/Iriomote Is. was investigated in eight species of hermatypic corals by allozyme electrophoresis. Laboratory experiments to estimate settlement competency periods of coral larvae were also conducted in three of the eight coral species. The degree of gene flow was similar among the three regions in species having long settlement competency periods (broadcast spawning corals such as Acropora digitifera), but was greater between Okinawa Is. and Kerama Is. than between Okinawa-Kerama and Ishigaki/Iriomote in species having short settlement competency periods (planula brooding corals such as Stylophora pistillata).3. Genotypic diversity of coral symbiotic zooxanthellae among the sites with different coral mortality due to bleaching: Genotypic diversity of symbiotic zooxanthellae in six coral species was compared among three sites that suffered from different degree of coral bleaching in 1998 by DNA analysis using SSCP method. The genotypic diversity of the zooxanthellae was the highest at a site that suffered from the lowest coral mortality due to bleaching, and the lowest at a site that suffered from the highest coral mortality.

1。冲绳岛附近的珊瑚社区：1998年发生大规模珊瑚漂白后的珊瑚社区的恢复过程，在冲绳岛中西部海岸的珊瑚礁建立的10个站点进行了监测。在每个车站设置了珊瑚幼虫的定居点，并在收集后检查了定居的珊瑚。在每个车站也对珊瑚社区进行了调查。很少有成熟的Acropora殖民地，但是位于Kerama群岛附近的车站的Acropora招募很大。建议科拉马群岛的珊瑚种群是冲绳岛珊瑚群落恢复的珊瑚幼虫的来源。2。 Ryukyu群岛中珊瑚种群的种群遗传学：冲绳中的珊瑚种群的基因流是。通过同种酶电泳在八种雌雄同体的珊瑚中进行了研究。还在八个珊瑚物种中的三个进行了实验室实验以估计珊瑚幼虫的定居能力期。在具有长期定居能力期（广播产卵珊瑚（如Acropora digitifera）的较长的物种中，这三个区域之间的基因流量程度相似，但是冲绳之间的基因流量更大。而Kerama是。在具有较短的定居能力期的物种（诸如Stylophora pistillata之类的planula繁殖珊瑚）的物种中，比冲绳 - 凯拉马和伊希加基/伊iiomote之间。3。在1998年通过使用SSCP方法进行DNA分析，在1998年通过不同程度的珊瑚珊瑚漂白程度，比较了六个珊瑚物种中共生Zooxanthellae的基因型多样性：由于漂白而不同的珊瑚死亡率：共生Zooxanthellae的基因型多样性。 Zooxanthellae的基因型多样性是由于漂白引起的珊瑚死亡率最低的地点，并且在珊瑚死亡率最高的地点处最低。