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RADIOCARBON DATING OF PRECIOUS CORALS OFF THE SOUTHWEST COAST OF KOCHI PREFECTURE, SOUTHWEST JAPAN
Radiocarbon ( IF 8.3 ) Pub Date : 2020-11-23 , DOI: 10.1017/rdc.2020.114
Tomoyo Okumura , Fujio Kumon , Hidekazu Tokuyama

Radiocarbon (14C) dating was performed for various types of precious coral colony fragments collected from the Ashizuri fishing field, around 100–200 m deep, off the southwest coast of Kochi Prefecture, Japan, to understand the historical background of one of the largest precious coral fishing fields in Japan. The 14C ages of the 55 specimens range from ~7500 years ago to the modern. Most of the measured samples were older than 1871, when fishing activities of precious corals began in Kochi Prefecture. These results suggest that most of the deaths of the precious coral colonies were due to natural causes, such as natural mortality, predation, or various forms of environmental degradation, and not strictly related to destructive fishing practices. Additionally, precious corals started inhabiting the study area at least ~7500 years ago, when the marine condition became similar to that of today after the Last Glacial Period. This study is the first to focus on the age of dead precious coral fragments and has revealed that they might be an important fossil resource that could lengthen the timespan of precious coral fishery. This additional time may enable us to establish reasonable and effective regulations for sustainable fishery.

中文翻译:

日本西南部高知县西南海岸珍贵珊瑚的放射性碳测年

放射性碳 (14C) 对从日本高知县西南海岸约 100-200 m 深的 Ashizuri 渔场收集的各种类型的珍贵珊瑚群落碎片进行了测年,以了解最大的珍贵珊瑚捕捞活动之一的历史背景日本的田野。这1455 个标本的 C 年龄范围从约 7500 年前到现代。大多数测量的样本都比 1871 年更早,当时高知县开始进行珍贵珊瑚的捕捞活动。这些结果表明,珍贵珊瑚群落的大部分死亡是由于自然原因造成的,例如自然死亡、捕食或各种形式的环境退化,而不是与破坏性捕捞活动密切相关。此外,珍贵的珊瑚至少在大约 7500 年前开始栖息在研究区域,当时海洋状况与末次冰期后的今天相似。这项研究首次关注死去的珍贵珊瑚碎片的年龄,并揭示它们可能是一种重要的化石资源,可以延长珍贵珊瑚捕捞的时间跨度。
更新日期:2020-11-23
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