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Conservation biology of dugong Okinawa population

冲绳儒艮种群的保护生物学

基本信息

批准号：
15201049
负责人：
OHTAISHI Noriyuki
金额：
$ 29.45万
依托单位：
Rakuno Gakuen University (2004-2006)Hokkaido University (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

There're relatively few studies on dugong populations in Asia as far, However, Asian dugongs are endangered by development and coastal use by human activities. Further studies on dugong ecology are required for conservation of Asian dugong.In Philippines, WWF reported Philippines' dugong populations, but most of information did not based on scientific studies. There is a few researches in Palawan island. We, Japanese and Philippines' cooperative project, are studying on dugong behavior and feeding ecology of Malita, Mindanao.In China, Hinan island has been known that dugong occurred frequently. However, in our investigation almost seagrass beds on the northern coast of the island were extinct by coastal development and harbor construction. So, it was disappeared the conditions of dugong living. In Japan, It has been thought that dugong was extinct several decades ago. But, a dugong population was discovered again Okinawa island before less than 10 years. After re-discover, there were many efforts and to know dugong population and reported (Ministry of Environment. Ministry of Defense. Department of Fisheries. Etc.). Nevertheless, population size was not known exactly, about 10 by the estimation. Now, the dugong population faces to extinction due to.In our investigation of the dugong ruin, which is also called Nanazou Utaki, on the island of Simoji in the southern part of Ryukyu archipelago, Japan. We recognized fourteen stoneworks in the dugong ruin. The form of some stoneworks were similar to that of an extended flue used to capture dugong. forty six parietal bones, eight occipital bones, 22 mandibles, an atlas and a humerus were unearthed. The dugong bones had been disturbed, as the incisors and molars had been extracted from the alveolar. If neglection of the ruin and the dugong bones is continued, a great heritage will be lost. It is necessary to organaize a conservation committee.

迄今为止，关于亚洲儒艮种群的研究相对较少，然而，亚洲儒艮因人类活动的开发和沿海利用而濒临灭绝。亚洲儒艮的保护需要对儒艮生态学进行进一步的研究。在菲律宾，世界自然基金会报告了菲律宾的儒艮种群，但大多数信息都没有基于科学研究。巴拉望岛有一些研究。我们是日本和菲律宾的合作项目，正在研究棉兰老岛马利塔的儒艮行为和摄食生态。在中国的希南岛，已知儒艮频繁出现。然而，在我们的调查中，该岛北部海岸的海草床几乎因沿海开发和港口建设而灭绝。于是，儒艮的生存条件就消失了。在日本，儒艮被认为在几十年前就已经灭绝了。然而，不到10年，冲绳岛再次发现了儒艮种群。重新发现后，进行了许多努力来了解儒艮种群并进行报告（环境部、国防部、渔业部等）。然而，具体人口规模尚不清楚，估计约为 10 人。现在，儒艮种群面临着灭绝的危险。在我们对位于日本琉球群岛南部的下地岛上的儒艮遗址（也称为七藏宇泷）进行的调查中。我们在儒艮遗址中认出了十四座石雕。一些石制品的形状类似于用于捕获儒艮的延长烟道。出土了顶骨46块、枕骨8块、下颌骨22块、寰椎1块、肱骨1块。由于门牙和臼齿已从牙槽中拔出，儒艮的骨骼已被破坏。如果继续忽视遗址和儒艮骨头，伟大的遗产将会消失。有必要组织一个保护委员会。