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. 冲绳岛周围珊瑚群落的恢复：1998年发生大规模珊瑚白化后，在冲绳岛中西海岸珊瑚礁上设立的10个站对珊瑚群落的恢复过程进行了监测。每个站均设置珊瑚幼虫沉降板，采集后对沉降的珊瑚进行检查。每个站还对珊瑚群落进行了调查。成熟的鹿角珊瑚群落很少，但位于庆良间群岛附近的站内鹿角珊瑚的补充量很大。建议庆良间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．琉球群岛珊瑚种群的种群遗传学：冲绳群岛、庆良间群岛和石垣岛/西表群岛珊瑚种群的基因流。通过等位酶电泳对八种造血型珊瑚进行了研究。还对八种珊瑚中的三种进行了实验室实验，以估计珊瑚幼虫的定居能力期。具有长定居能力的物种（如鹿角珊瑚等广播产卵珊瑚）的三个区域之间的基因流动程度相似，但冲绳岛之间的基因流动程度更大。和庆良间群岛。与冲绳-庆良间和石垣/西表之间的物种相比，定居能力期短的物种（浮萍育雏珊瑚，如 Stylophora pistillata）。3。不同珊瑚白化死亡率地点珊瑚共生虫黄藻的基因型多样性：采用SSCP方法对1998年遭受不同程度珊瑚白化的三个地点进行DNA分析，比较了6种珊瑚中共生虫黄藻的基因型多样性。在珊瑚因白化而死亡率最低的地点，虫黄藻的基因型多样性最高，在珊瑚死亡率最高的地点，虫黄藻的基因型多样性最低。