Marine ecological study on the habitat of Nautilus pompilius in Fiji (the second operation) - A detailed suryey on the environmental factors.

1987年夏天，我们在鹿儿岛开了一个研究会议，讨论了每个研究项目在研究过程中出现的问题，以及发表最终研究结果的计划。研究内容包括：(1)苏华鹦鹉螺栖息地的环境背景，特别是详细的地形特征；(2)根据捕集实验获得的样品，对鹦鹉螺及其伴生生物进行组合分析；（三）所得生物的鉴定、测量和描述；(4)鹦鹉螺生理研究；(5)用拖网和疏浚法取样底栖生物；(6)用水下相机拍摄海底生物的行为。每一个项目的研究结果，在上面的报告中都有详细的叙述，其中有各种各样的事实和资料，使我们对诺第留斯号的生理学、生态学和声学方面的知识有了新的认识。(1)阐明高密度鹦鹉螺栖息地的详细地形特征及其生态意义；(2)在Ovalau岛附近海域进行的初步调查表明，鹦鹉螺的栖息地与苏瓦岛附近的栖息地相似；(3)在苏瓦附近的鹦鹉螺栖息地进行了第一次拖网和疏浚实验，这对获得关于底栖生物的随机信息特别重要；(4)根据水下相机拍摄的266张照片，分析了被摄生物的出现顺序和时间范围、觅食行为和感觉行为。

In summer,987,we had a research meeting in Kagoshima to discuss the problems coming out on the course of study in each research item and the plan for publishing the final result s of our studies as well.The research items were as follows:(1)Environmental background,especially detailed topographic features of the habitat of Nautilus off suva;(2)Assemblage analyses of Nautilus and its associated organisms based on the samples obtained by trapping experiments; (3)Identification,measurements and description of organisms obtained; (4)Physiological study on Nautilus; (5)Sampling of benthonic organisms by trawling and dredging; (6)Photographing of behaviors of organisms on the sea bottom with a underwater still camera.Details of the result of study in each item were already described in the report mentioned above with various facts and informations new to our knowledge concerning physiology,ecology and tephonomy of Nautilus. (1)Detailed topographic feature of the site inhabited by Nautilus with high density and its ecological implication was clarified; (2)Preliminary survey in the area off Ovalau Island resulted in the recognition of similarity of habitat of Nautilus ot that off Suva; (3)The first experiments of trawling and dredging, which is particularly important to get at rondom information on the benthonic organisms,were carried out in the habitat of Nautilus off Suva; (4)Based on 266 pictures taken by the underwater sitll camera,order andd time range of appearance,behavior of searching for foods and feeking behavior of the photographed organisms were analyzed.