Enhancing settlement and growth of corals using feeble electrochemical method
Enhancing settlement and growth of corals using feeble electrochemical method
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利用弱电化学方法促进珊瑚的沉降和生长
DOI：
10.3755/galaxea.15.323
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Y. Hosokawa
中科院分区：
文献类型：
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作者：
Kazuyoshi Kihara;H. Taniguchi;Y. Koibuchi;S. Yamamoto;Y. Kondo;Y. Hosokawa
人们对电场促进珊瑚幼虫定居和提高珊瑚幼体生长速度的潜在应用产生了相当大的兴趣。此外，据报道，当电流流过附着的铁基时，通过电化学过程产生的矿物质沉积物所形成的涂层可促进移植珊瑚碎片的生长和存活。然而，由于目前科学证据非常有限，还需要进一步调查。在本研究中，通过冲绳的实地观察调查了珊瑚生长的最佳电流密度范围。研究发现，在经过电处理以防止腐蚀的浮桥表面，自然定居的造礁珊瑚在实际电流密度大于10 mA/m的区域生长得更快。然后，对附着在海底安装的四个铁框架结构上的珊瑚碎片进行了现场实验，这些铁框架结构具有不同的微弱电流密度。结果，电流密度为20~100 mA/m的珊瑚碎片表现出相对但并不总是比其他珊瑚碎片更快的生长。有人提出，在强电流下可能会产生不利影响。另一方面，幼虫对没有电流的矿物附着基质表现出比对未上釉陶瓷板更大的沉降亲和力。
Considerable interest has been generated by the potential application of electric-fields to promote settlement of coral larvae and enhance growth rates of coral juveniles. Also, it has been reported that when an electric current is run through an attached iron base, coating by the resultant accretion of minerals through electrochemical processes, promotes the growth and survival of transplanted coral fragments. However, further investigations are required due to currently very limited scientific evidence. In the present study, the optimal range of electric current density for coral growth was investigated through field observations in Okinawa. It was found that naturally settled reef-building corals on the surface of a floating pontoon, on which an electrical treatment was applied to prevent corrosion, grew faster in the areas where the actual electric current density was greater than 10 mA/m. An in situ experiment was, then, carried out on coral fragments that were attached to four iron-framed structures installed on the seabed with different feeble current densities. As a result, the coral fragments with the current density of 20~100 mA/m showed relatively, but not always, faster growth than others. It was suggested that adverse effects might occur under strong electric currents. On the other hand, larvae exhibited far greater settlement affinity for the mineral accreted substrates without electric current than for the unglazed ceramic plates.