Research on Coastal Environmental Conservation

三陆沿岸大石湾的潮汐余流具有明显的季节变化，春季至秋季为逆时针环流，沿北岸流入，南岸流出，秋季至春季以河口型垂直环流为主，受西北季风风影响，表层混合强烈。这项研究还估计了海湾水交换的时间尺度约为10天。从越南黑水中分离的一种底栖硅藻Nitzschia navis-varingica被发现能产生软骨藻酸。在对产软骨藻酸硅藻分布的调查中发现，从日本三陆海岸、北太平洋地区到琉球岛、菲律宾等南亚国家，广泛分布着产软骨藻酸的海军软骨藻。此外，从菲律宾采集的几个菌株被发现产生软骨藻酸的异构体和软骨藻酸。这些FI…更多的结果表明，产生软骨藻酸的N.navis-varingica在世界上分布广泛。因此，以本研究开发的软骨藻酸特异性抗体为基础，采用酶联免疫吸附试验对热带地区采集的各种双壳类贝类中的软骨藻酸进行了筛选。研究结果表明，在属于脊椎动物属的特定双壳类物种中积累了大量的软骨藻酸。在与Spondylus sp.相同地区采集的其他双壳类物种中未检测到软骨藻酸。我们以海洋哺乳动物、鱼类、甲壳类等为研究对象，研究了有机氯化合物、有机锡化合物和重金属等有害化学物质对海洋的污染。我们发现有机锡化合物和共面多氯联苯在自然水平上暴露于达尼列夫斯卡普雷拉的繁殖率较低、形态异常和性功能障碍。丁基锡和非邻位共面多氯联苯在体外对海洋哺乳动物和人类淋巴细胞的丝裂原诱导反应表明，与共面多氯联苯相比，丁基锡在自然水平上具有更大的毒性。从来自北冰洋的里海海豹、贝加尔海豹和环斑海豹的血清样本中检测到源于人类的甲型流感病毒。日本沿海的江豚和须鲸也感染了较低水平的A型流感病毒。较少

The tidal residual current in Otsuchi Bay on the Sanriku Coast shows a clear seasonal change.An anti-clockwise circulation exists in stratified period from spring to autumn, flowing into the bay along northern coast and out along the southern coast, while an estuary-type vertical circulation isdominant from autumn to spring, when there is strong surface mixing due to the NW monsoon wind. This study also estimates the time scale of water exchange of the Bay at approximately 10 days. A benthic diatom Nitzschia navis-varingica isolated from blackish water in Vietnam was found to produce domoic acid. In the survey on the distribution of domoic acid-producing diatom, domoic acid-producing N. navis-varingica was found to distribute in wide areas from Sanriku coast, a northern Pacific area of Japan to south asian countries such as ryukyu island and Philippines. In addition, several strains collected from Philippines were found to produce isomers of domoic acid as well as domoic acid. These fi … More ndings show the wide distribution of domoic acid-producing N. navis-varingica in the world. Thus, domoic acid in various bivalve species collected from tropical areas was screened by ELISA based on the specific antibody against domoic acid which was developed in the present study. The results of the study showed that a significant level of domoic acid was accumulated in the specific bivalve species belonging to a genus Spondylus. No domoic acid was detected in other bivalve species collected from the same areas as Spondylus spp.We studied marine pollution of hazardous chemicals such as organochlorine compounds, organotin compounds and heavy metals using marine mammals, fishes, crustaceans, etc. Specific accumulation pattern was recognized in Baikal seals and Dall's porpoises. We found the lower reproductive rate, the morphological abnormality, and the sexual disturbance of Caprella danilevskii exposed at the natural level by organotin compounds and coplanar PCBs. Mitogen-induced responses in marine mammal and human lymphocytes by in-vitro exposure of butyltins and non-ortho coplanar PCBs indicated that butyltins were more toxic at the natural level compared with the coplanar PCBs. The influenza A viruses originated from humans were detected from serum samples of Caspian seals, Baikal seals and the ringed seals from the Arctic Ocean. Dall's porpoises and baleen whales off the coast of Japan were also infected at lower level by influenza A viruses. Less