Degradation mechanism on coastal ecosystems in shallow water as open multi-coupling systems and their conservation strategy

1)通过对石垣岛东海岸岸礁的实地调查，发现了红泥平流扩散过程及营养盐和浮游植物时空变化的特征。2)通过对石垣岛白穗礁的实地考察和数值模拟，揭示了礁体周围珊瑚浮油的形成机制、蓝珊瑚（Heliopora coerulea）幼虫在水体中的释放时间和密度分布及其对潮汐相位的依赖性。3)我们开发了一个数值的3-D电流模型结合珊瑚冠层模型，从而发现，珊瑚幼虫可能会保留更长的时间在珊瑚礁小潮前后释放时。4)我们进行了长期连续测量的陆地环境负荷从Todoroki流域相邻的上述珊瑚礁和开发的基本模型，用于评估陆基环境排放。5)开发微型卫星 ...更多信息 通过对采自包括琉球群岛在内的印度洋-太平洋地区23个地点的棘冠海星标本进行基因标记和遗传种群分析，我们发现基因流强烈地受到有关地区洋流大小的控制。通过对黑潮区附近幼鱼扩散的数值模拟，再现了菲律宾、琉球群岛、九州、四国和纪伊半岛沿岸沿着的不对称扩散过程，并通过遗传种群分析阐明了黑潮可能诱发二次爆发。6)研究表明，珊瑚柱芯可提供近千年的环境波动信息，其时间分辨率可达百年;红树林粘土柱芯可提供近百年的环境信息，其时间分辨率可达数年;珊瑚年轮可提供近百年的环境和地表径流信息，其时间分辨率可达1个月。少

1) Conducting field surveys in the fringing reef of the east coast of Ishigaki Island, we found characteristic features of advective diffusion process of red-silt and spatio-temporal variations of nutrients and phytoplankton. 2) Based on the results of field surveys and numerical simulations for the Shiraho reef of Ishigaki Island, we found the formation mechanism of coral slicks around the reef, and the release timing and density distributions in the water column of blue coral (Heliopora coerulea) larvae and their dependence on the tidal phase. 3) We developed a numerical 3-D current model incorporated with a coral canopy layer model and thereby found that the coral larvae may retain longer in the reef when released around neap tide. 4) We conducted long-term continuous measurements of terrestrial environmental loads from the Todoroki watershed adjacent to the above mentioned reef and developed a basic model for evaluating the land-based environmental discharge. 5) Developing microsat … More ellite markers and conducting genetic population analyses of crown-of-thorns starfish specimens taken from 23 sites in the Indo-Pacific regions including the Ryukyu Islands, we found that the gene flows are strongly governed by the magnitude of the ocean currents in the area concerned. With the numerical simulations of larval dispersal around the Kuroshio area, we reproduced the asymmetrical dispersal process along the area covering the Philippines, the Ryukyu Islands, Kyushu, Shikoku and Kii Peninsula, and clarified also with genetic population analyses that the Kuroshio may induce the secondary outbreaks. 6) We have indicated that coral cores may provide environmental fluctuation information over the past thousands years with the time resolution of 100 years, mangrove clay cores may provide information over the past 100 years with several years resolution, and coral annual rings may provide information of environments and terrestrial runoff in the past 100 years with 1 month resolution. Less