Studies on feeding and reproductive ecology of parrotfishes, key species for recovery of corals

珊瑚恢复关键物种鹦嘴鱼的摄食和繁殖生态学研究

基本信息

批准号：
18510207
负责人：
KUWAMURA Tetsuo
金额：
$ 2.61万
依托单位：
Chukyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18510207/
关键词：
Conservation of coral reefs Parrotfishes Herbivore Feeding site Reproductive behavior and ecology Spawning time Iriomote Island, Okinawa Acanthuridae

项目摘要

1. Distribution and abundance of pattotfishes (Scaridae) were investigated on the coral reefs of Iriomote Island, Tokashiki Island, and Sesoko Island, Okinawa. Spawning site was found only on the fringing reef of Iriomote Island where parrotfish were most abundant among the three locations. Observations on their feeding behavior revealed that most of them bit dead coral skeleton to take filamentous algae but did not bite live corals.2. Spawning of 13 species of parrotfishes was observed at a projection of the reef edge on the north coast of Iriomote Island. Spawning time differed among species: parrotfishes that migrated a long way (ca.500m) to inshore feeding sites tended to spawn only in the early morning (0630-0830hurs), while species that foraged near the reef edge usually spawned at high tide. By contrast, surgeonfish (Acanthuridae), another herbivorous fish, usually spawned at dusk at the same reef edge. Further investigation is now in progress to reveal the reason why spawning time differed among the herbivorous pelagic spawners.3. Effects of algae and herbivorous fishes on survival and growth of small coral colonies were examined by caging experiments on the reef flat of Iriomote Island. The results suggested that not only parrotfishes but also surgeonfishes affected on the growth and survival of small coral colonies at the study site.4. Effects of bites on live coral colonies, probably by fishes, were investigated on the fringing reefs of Iriomote Island and Sesoko Island. The growth rate of small branching corals, Acropora spp., decreased when their tips were bit. On the other hand, the growth rate of massive corals, Porites spp., did not differ whether they had many teeth marks or not.

1。在Iriomote Island，Tokashiki Island和冲绳岛的Sesoko Island的珊瑚礁上研究了Pattotfishes（Scaridae）的分布和丰度。仅在三个地点中鹦鹉鱼中最丰富的Iriomote岛的边缘礁上发现了产卵地点。对他们的喂养行为的观察表明，大多数人咬住了死珊瑚骨骼以服用丝状藻类，但没有咬住活珊瑚。2。在Iriomote Island北部海岸的礁边缘的投影中观察到13种鹦鹉鱼的产卵。产卵时间在物种之间有所不同：鹦鹉鱼迁移了很长一段路（Ca.500m）到近海喂养地点，直到仅在清晨（0630-0830HUR）倾向于产卵，而在礁石边缘附近觅食的物种通常在高潮时产生。相比之下，另一种草食性鱼（通常是在同一礁边缘的黄昏时代产卵的）的Sumpheonsfish（Acanthuridae）。现在正在进行进一步的调查，以揭示出产卵时间在草食性骨膜产卵中有所不同的原因3。藻类和草食性鱼类对小珊瑚菌落的生存和生长的影响，通过在Iriomote Island的礁石公寓上进行笼子实验。结果表明，不仅对小珊瑚菌落在研究地点的生长和生存影响的外科生不仅鹦鹉鱼。4。叮咬对伊洛莫特岛和佐索科岛的边缘礁的研究对现场珊瑚殖民地的影响进行了研究。小分支珊瑚的生长速率Acropora spp。尖端降低。另一方面，大型珊瑚（Porites spp。）的生长速率是否有很多牙齿标记没有差异。