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The sub-fossil red coral of Sciacca (Sicily Channel, Mediterranean Sea): colony size and age estimates
Facies ( IF 1.8 ) Pub Date : 2021-02-07 , DOI: 10.1007/s10347-020-00620-x
Giorgio Bavestrello , Marzia Bo , Lucio Calcagnile , Martina Canessa , Marisa D’Elia , Gianluca Quarta , Federico Spagnoli , Riccardo Cattaneo-Vietti

The Mediterranean red coral, Corallium rubrum (L.), has been a valuable economic resource for more than 2000 years. The Sicily Channel and surrounding areas are one of the most famous red coral fishing grounds of the whole region, hosting the deepest ever found living colonies and large sub-fossil red coral deposits; the so-called Sciacca banks are a unique location in the whole Mediterranean Sea. In this paper, a morphometric description of this sub-fossil population is presented for the first time from studies of colonies in the collection of several coral factories from Torre del Greco (Naples), with radiocarbon age estimations and growth rate evaluations. From the results of this study, after several thousand years Sciacca red coral colonies maintained the organic matrix structure with evident annual discontinuities, allowing estimations of the annual growth rate (about 0.3 mm/year) and the average population age (about 33.5 years). These resulting data are similar to the values determined for deep-dwelling living red coral populations. The radiocarbon dating evidenced a range of ages, from 8300 to 40 years before 1950 CE, mostly falling between 2700 and 3900 YBP, suggesting that colonies accumulated over a wide span of time. In view of the tectonically active nature of the area, several catastrophic events affected these ancient populations, maintaining them in a persistent state of early-stage, structurally similar to the those in current over-exploited areas.



中文翻译:

夏卡亚次化石红珊瑚(地中海西西里海峡):殖民地规模和年龄估计

地中海红珊瑚,红珊瑚虫(L.)是超过2000年的宝贵经济资源。西西里海峡及周边地区是整个地区最著名的红珊瑚渔场之一,拥有迄今发现的最深的生物群落和大型的亚化石红珊瑚沉积物。所谓的夏卡银行在整个地中海地区都是独一无二的位置。在本文中,首次从托雷德尔格雷科(那不勒斯)的几家珊瑚工厂收集了菌落,并对放射性碳年龄和生长速率进行了评估,首次对亚化石种群的形态进行了描述。根据这项研究的结果,经过数千年的夏卡红珊瑚菌落保持了有机基质结构,并具有明显的年度间断性,从而可以估算出年增长率(约0。3毫米/年)和平均人口年龄(约33.5岁)。这些结果数据与为深居住的红珊瑚种群确定的值相似。放射性碳测年表明其年龄范围为公元1950年之前的8300至40年,主要落在2700至3900 YBP之间,这表明菌落在很长一段时间内积累。鉴于该地区的构造活跃性质,一些灾难性事件影响了这些古代人口,使他们处于早期的持久状态,其结构与当前过度开发地区的相似。大部分落在2700至3900 YBP之间,这表明菌落在很长一段时间内积累起来。鉴于该地区的构造活跃性质,一些灾难性事件影响了这些古代人口,使他们处于早期的持久状态,其结构与当前过度开发地区的相似。大部分落在2700至3900 YBP之间,这表明菌落在很长一段时间内积累了。鉴于该地区的构造活跃性质,一些灾难性事件影响了这些古代人口,使他们处于早期的持久状态,其结构与当前过度开发地区的相似。

更新日期:2021-02-07
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