Taxonomical and Ecological Study on alpheid shrimps living in tunnel bored in rock at the Ryukyu Islands

琉球群岛岩石隧道中生活的白虾的分类学和生态学研究

• 批准号: 14540655
• 负责人: TAKEDA Masatsune
• 金额: $ 1.66万
• 依托单位: National Museum of Nature and Science, Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540655/
• 关键词: Alpheid shrimps; Boring; Tunnel; Alpheus obesomanus; Jonesius; Ryukyu Islands; 岩石穿孔性; ライブロック; 奄美大島; ゾエア幼生

During this study from 2002 to 2004, many specimens of alpheid shrimps living tunnels bored in rocks were collected in many places in Amami-Oshima Island, Okinawa-jima Islands and Ishigaki-jima Islands in the Ryukyu Islands. The shrimps and the small crabs also living in tunnels were identified, and the rocks were cut into several slices to get information about details of the tunnels. Shape of the tunnels are not always constant, becoming thicker and more complicated in the larger inhabitants, but it is sure that they cannot go out of the tunnel, because the diameter of the opening(s) is (are) only 1.5-2.5 mm much smaller than the size of the shrimps. The tunnel is smooth at the inside wall, and probably made wider and longer using the strong hammer-shaped movable finger. The collected specimens were identified with Alpheus obesomanus distributed in the tropical Indo-West Pacific coral reefs.On breaking the rock in the field, small crabs referable to the genus Jonesius of the family Trapeziidae were rather commonly found. It is apparent that they cannot dig the tunnel into rock by themselves, and therefore they use the abandoned tunnel of Alpheus obesomanus. Detailed examination of them revealed that they are referred to two different genera distinct from each other.

2002年至2004年的这项研究中，在琉球群岛的奄美大岛、冲绳岛和石垣岛的许多地方收集了许多在岩石中钻探的阿尔斑虾生活隧道的标本。识别出了同样生活在隧道中的虾和小螃蟹，并将岩石切成几片以获取有关隧道细节的信息。隧道的形状并不总是恒定的，对于较大的居民来说，隧道的形状会变得更厚、更复杂，但可以肯定的是，它们无法走出隧道，因为开口的直径只有 1.5-2.5 毫米比虾的大小小得多。隧道内壁光滑，可能是通过坚固的锤状可动手指变得更宽更长。采集到的标本经鉴定为分布于热带印度洋-西太平洋珊瑚礁的Alpheus obesomanus。在野外凿岩时，经常发现属于梯形蟹科琼斯氏属的小蟹。显然，他们无法自己在岩石中挖掘隧道，因此他们使用了 Alpheus obesomanus 废弃的隧道。对它们的详细检查表明它们属于两个不同的属。

项目成果

Progress of Medical Parasitology in Japan, Vol.7.(Otsuru, M., S. Kamegai, S. Hayashi eds.)

日本医学寄生虫学进展，第 7 卷（Otsuru, M., S. Kamegai, S. Hayashi 编辑）

• 发表时间: 2003
• 作者: Toshiaki Kuramochi