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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：在冲绳岛中西部沿岸的珊瑚礁上设立了10个监测站，监测1998年大规模珊瑚白化后珊瑚群落的恢复过程。在各监测站设置珊瑚幼虫沉降板，收集后对沉降珊瑚进行检查。每个监测站亦进行珊瑚群落调查。成熟的鹿角虫很少，但在Kerama群岛附近的站点，鹿角虫的招募很大。这表明，喀喇玛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。琉球群岛珊瑚种群遗传学：冲绳群岛珊瑚种群的基因流动。Kerama Is。石垣/Iriomote Is。对8种异型珊瑚进行了等位酶电泳研究。研究人员还对8种珊瑚中的3种进行了实验室实验，以估计珊瑚幼虫的定居能力期。具有较长定居能力期的物种（如广播产卵珊瑚Acropora digitalfera）在三个地区之间的基因流动程度相似，但冲绳群岛之间的基因流动程度更大。和Kerama Is。在定居能力期较短的物种（如柱头珊瑚）中，冲绳- kerama和石垣/Iriomote之间的差异要大。不同珊瑚白化死亡率地点珊瑚共生虫黄藻基因型多样性：采用SSCP方法对1998年3个不同程度珊瑚白化地点6种珊瑚的共生虫黄藻基因型多样性进行了DNA分析比较。虫黄藻的基因型多样性在珊瑚白化死亡率最低的地点最高，在珊瑚白化死亡率最高的地点最低。