权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The ecological and taxonomical study on the living ostracods from coral reefs in the Sckisci-sho area, Ryukyu Islands, Japan

日本琉球群岛礁石庄地区珊瑚礁活介形类的生态和分类学研究

基本信息

批准号：
02640612
负责人：
TABUKI Ryoichi
金额：
$ 1.15万
依托单位：
University of the Ryukyus
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

The purpose of this study is to reveal the ecological distributions of ostracod species from coral reefs in the Sekisei-sho area, Ryukyu Islands, and to carry out the systematic descriptions on the undescribed species. In September, 1990, 30 samples for living ostracods were collected by SCUBA diving from 10 locations (about 3 to 15 meters deep); 5 locations in the lagoon and 5 in the reef slope. As a result, 76 species belonging to 40 genera of Podocopa and 2 species of Myodocopa were identified. Based on the distribution patterns of 30 podocopid species occurring frequently, three species groups in relation to the kinds of substrates can be distinguished; the first group appear in close relation to sand bottom, and the second is almost confined to macroalgae or filamentous minute algae on hard bottom such as rocks or gravels, and the third have no distinct relation to particular kinds of substrates. The species composition of the first and second groups are respectively variable to some extent, depending on the grain size distribution of sand bottom and the shape of macroalgae and rocks or gravels on which filamentous algae grow. Some species also differ in abundance depending on the nature of surrounding water mass such as oceanic or lagoonal. Taxonomical work on undescribed species over 50 are still ongoing. In this study, soft parts such as appendages and male sexual organs, which are not usually preserved as fossils, are also used as important taxonomical characters with carapace.

本研究的目的是揭示琉球群岛关成庄地区珊瑚礁介形类的生态分布，并对未描述的介形类进行系统描述。1990年9月，在10个地点（约3 - 15米深）用水肺潜水采集了30个活体介形类样品，其中5个地点在泻湖，5个地点在礁坡。经鉴定，足肢介属40属76种，刺肢介属2种。根据30种常见的桡足类的分布格局，可将其划分为与底质关系密切的3个种群，第1种群主要分布于砂质底质上，第2种群主要分布于岩石、砾石等硬底质上的大型藻类或丝状微小藻类，第3种群与底质关系不明显。第一类和第二类的种类组成分别具有一定的变异性，这取决于砂底的粒度分布、大型藻类的形状以及丝状藻类生长的岩石或砾石。一些物种的丰度也因周围水体的性质而异，如海洋或泻湖。对50种以上未描述物种的分类工作仍在进行中。在这项研究中，通常不被保存为化石的附属物和雄性性器官等柔软部分也被用作与甲壳的重要分类特征。