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首页> 外文期刊>Facies >Effect of the surgeonfish Ctenochaetus striatus (Acanthuridae) on the processes of sediment transport and deposition on a coral reef in the Red Sea
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Effect of the surgeonfish Ctenochaetus striatus (Acanthuridae) on the processes of sediment transport and deposition on a coral reef in the Red Sea

机译：刺尾鱼Ctenochaetus striatus（Acanthuridae）对红海珊瑚礁沉积物运输和沉积过程的影响

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摘要

Excessive sedimentation is a major threat to coral reefs. It can damage or kill reef-building corals and can prevent the successful settlement of their planktonic larvae. The surgeonfish Ctenochaetus striatus feeds on rocky surfaces by sweeping loose material into its mouth with its flexible, broom-like teeth. In addition, it grasps and removes hard substrates with the aid of its special palate structure. It then transports sediment matter off the reef by defecating the ingested material outside the rocky zone of the reef. We analyzed 150 feces samples of six individuals, differentiating between (1) ingested by sweeping and (2) ingested by scraping, and compared their content with inorganic land-derived and marine sediments trapped at the feeding area. Projections based on fish densities, defecation rates, and quantities as well as composition of sediments collected by traps on the same reef site suggest that C. striatus removes at least 18% of the inorganic sediment sinking onto the reef crest. The eroded share in the exported matter is about 13%. This finding points to a hitherto not verified role of C. striatus as a reef sweeper and reef scraper, whereby the first function is by far dominating.
机译：过多的沉积物是对珊瑚礁的主要威胁。它可能破坏或杀死造礁珊瑚，并可能阻止其浮游幼虫的成功沉降。刺尾鱼Ctenochaetus striatus的食道是在岩石表面上进食，将松散的物质用其柔软的扫帚状牙齿扫入其嘴中。此外，它还具有特殊的味觉结构，可以抓握并去除硬质基材。然后，它通过在礁石的岩石区外排泄所摄取的物质，将沉积物从礁石中运出。我们分析了六个人的150个粪便样本，区分了（1）扫掠和粪便（2）摄取，并将它们的含量与饲喂区捕获的无机土地来源和海洋沉积物进行了比较。根据鱼的密度，排便率和数量以及通过在同一礁石位置上的诱捕器收集的沉积物组成进行的预测表明，细纹衣藻可去除至少18％的沉入礁顶的无机沉积物。出口品中被侵蚀的份额约为13％。这一发现表明，迄今尚未得到证实的条状梭菌作为珊瑚礁清扫器和珊瑚礁刮除器的作用，从而首要功能是支配地位。

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