Quantification of Cypris Larvae of Barnacles in Sailing, Anchoring, and Berthing Areas of Western Japan as well as in Tokyo Port in Summer
Quantification of Cypris Larvae of Barnacles in Sailing, Anchoring, and Berthing Areas of Western Japan as well as in Tokyo Port in Summer
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夏季日本西部航行、抛锚、停泊区域以及东京港的藤壶 Cypris 幼虫的定量
DOI：
10.11457/ssst.3.0_1
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
and Yoshiji YANO
中科院分区：
文献类型：
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作者：
Haruo MIMURA;Noriyuki ENDO;Kazuya KAWAI;and Yoshiji YANO
船舶船体上的生物污垢影响海运效率。藤壶是主要的船体污损生物之一。我们在2013年至2016年的航行，锚泊和停泊期间共采集了69个样品，通过qPCR定量藤壶的种类，并计数了个体无节幼体和鲤形幼体。其中以Chthalus challengeri、Tetraclita japonica、Balanus trigonus、Amphibalanus amphitrite、A. eburneus/A. improvsus、白脊管藤壶（Fistulobalanus albicostatus）、玫瑰巨藤壶（Megabalanus rosa）和M. 2014年从鹿儿岛港采集的两份样本中检测出了大肠杆菌。然而，无论取样地点如何，Cypris幼虫的数量都大大限制在不到22个个体（m-3），而无节幼体的数量变化高达9，828个个体（m-3）。在尾道港停泊时，约2只个体分别在浸没在平板（30平方厘米）的两侧定居（n= 6）。我们估计，在停泊期间，大约有11 500人在水下船体表面（518平方米）上定居。在大坂湾，Megabalanus物种组成。如此大的成年藤壶的高度影响摩擦阻力。为了防止生物污损，重要的是减少鲤幼虫与船体相互作用的频率，以便在到达下一个港口之前不将速度降低到小于0.6 ms-1。
Seaborne efficiency is influenced by biofouling on a ship’s hull. Barnacles are one of the major hull-fouling organisms. We took a total of 69 samples during sailing, anchoring, and berthing from 2013 to 2016, quantified the species of barnacles by qPCR, and counted individual nauplius and cypris larvae. The most species̶such as Chthamalus challengeri, Tetraclita japonica, Balanus trigonus, Amphibalanus amphitrite, A. eburneus/A. improvisus, Fistulobalanus albicostatus, Megabalanus rosa, and M. coccopoma̶were detected from two samples taken in Kagoshima Port in 2014. However, the numbers of cypris larvae were limited drastically to less than 22 individuals (m-3) regardless of the sampling sites, while those of nauplius larvae varied up to 9,828 individuals (m-3). Approximately 2 individuals each settled onto both sides of a flat plate (30 centimeters square) immersed at berthing in Onomichi Port (n= 6). We estimated that approximately 11,500 individuals settled onto the underwater hull surface (518 m2) during berthing. In Osaka Bay, Megabalanus species existed constitutively. The height of such large adult barnacles influences frictional drag. It is important for the prevention of biofouling to reduce the frequency of the interaction of cypris larvae with the hull so as not to decelerate the speed to less than 0.6 ms-1 until arrival at the next port.