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

987年夏天，我们在鹿儿岛召开了一次研究会，讨论了每个研究项目在研究过程中出现的问题和公布最终研究结果的计划。研究项目包括：(1)环境背景，特别是苏瓦附近鹦鹉螺栖息地的详细地形特征；(2)基于诱捕实验获得的样品对鹦鹉螺及其伴生生物的组合分析；(3)获得的生物体的鉴定、测量和描述；(4)鹦鹉螺的生理研究；(5)拖网和疏浚对底栖生物的采样；(6)用水下照相机拍摄生物在海底的行为。上述报告已经详细描述了每一项研究的结果，并提供了有关鹦鹉螺属生理、生态和物候学的各种新事实和信息。(1)阐明了鹦鹉螺高密度栖息地的详细地形特征及其生态意义；(2)通过对奥瓦劳岛附近海域的初步调查，认识到鹦鹉螺在苏瓦附近的栖息地具有相似性；(3)在苏瓦附近的鹦鹉螺栖息地进行了首次拖网和疏浚实验，这对获得底栖生物的随机信息特别重要；(4)根据水下现场相机拍摄的266张照片，分析了拍摄到的生物的出现顺序和时间范围、觅食行为和摄食行为。

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.