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Distribution and population structure of deep-dwelling red coral in the Northwest Mediterranean

机译：地中海西北部深层红珊瑚的分布和种群结构

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摘要

Commercially harvested since ancient times, the highly valuable red coral Corallium rubrum (Linnaeus, 1758) is an octocoral endemic to the Mediterranean Sea and adjacent Eastern Atlantic Ocean, where it occurs on rocky bottoms over a wide bathymetric range. Current knowledge is restricted to its shallow populations (15–50m depth), with comparably little attention given to the deeper populations (50–200m) that are nowadays the main target of exploitation. In this study, red coral distribution and population structure were assessed in three historically exploited areas (Amalfi, Ischia Island and Elba Island) in the Tyrrhenian Sea (Western Mediterranean Sea) between 50 and 130m depth by means of ROV during a cruise carried out in the summer of 2010. Red coral populations showed a maximum patch frequency of 0.20±0.04 SD patches·m−1 and a density ranging between 28 and 204 colonies·m−2, with a fairly continuous bathymetric distribution. The highest red coral densities in the investigated areas were found on cliffs and boulders mainly exposed to the east, at the greatest depth, and characterized by medium percentage sediment cover. The study populations contained a high percentage (46% on average) of harvestable colonies (>7mm basal diameter). Moreover, some colonies with fifth-order branches were also observed, highlighting the probable older age of some components of these populations. The Ischia population showed the highest colony occupancy, density and size, suggesting a better conservation status than the populations at the other study locations. These results indicate that deep dwelling red coral populations in non-stressed or less-harvested areas may diverge from the inverse size-density relationship previously observed in red coral populations with increasing depth.
机译：珍贵的红珊瑚珊瑚珊瑚（Linnaeus，1758）自古以来就进行了商业收获，是地中海和邻近的东大西洋的八叶虫特有种，它发生在宽测深范围的岩石底部。目前的知识仅限于其较浅的种群（深度为15–50m），而对较深的种群（50–200m）的关注相对较少，而较深的种群是当今的主要开发目标。在这项研究中，通过在2009年进行的一次航行中，利用ROV评估了第勒尼安海（西地中海）中第三个历史开发区域（阿马尔菲，伊斯基亚岛和厄尔巴岛）在50至130m深度的红珊瑚分布和种群结构。 2010年夏天。红珊瑚种群的最大斑块频率为0.20±0.04 SD斑块·m-1，密度在28到204个菌落·m-2之间，具有相当连续的测深分布。在被调查区域，在主要暴露于东部，最大深度的悬崖和巨石上发现了最高的红色珊瑚密度，其特征是沉积物覆盖率中等。研究人群包含较高百分比（平均46％）的可收获菌落（基径大于7mm）。此外，还观察到一些具有五阶分支​​的菌落，突显了这些种群中某些部分的年龄可能更高。伊斯基亚种群的菌落占有率，密度和大小最高，表明其保护状况优于其他研究地点的种群。这些结果表明，在未受胁迫或收割较少的地区深居的红珊瑚种群可能与以前在深度增加的红珊瑚种群中观察到的大小-密度反比关系不同。

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  • 来源
    《Marine ecology》 |2016年第2期|294-310|共17页
  • 作者

    Angiolillo Michela; Gori Andrea; Canese Simonepietro; Bo Marzia; Priori Cristina; Bavestrello Giorgio; Salvati Eva; Erra Fabrizio; Greenacre Michael; Santangelo Giovanni;

  • 作者单位

    Istituto Superiore per la Protezione e Ricerca Ambientale (ISPRA) III Dipartimento Tutela degli Habitat e della Biodiversità Marina Roma Italy;

    Universitat de Barcelona Departament d'Ecologia Barcelona Spain;

    Istituto Superiore per la Protezione e Ricerca Ambientale (ISPRA) III Dipartimento Tutela degli Habitat e della Biodiversità Marina Roma Italy;

    dell'Ambiente e della Vita Università degli Studi di Genova Dipartimento di Scienze della Terra Genova Italy;

    Università degli Studi di Pisa Dipartimento di Biologia Pisa Italy;

    Istituto Nazionale di Oceanografia e Geofisica Sperimentale Trieste Italy;

    dell'Ambiente e della Vita Università degli Studi di Genova Dipartimento di Scienze della Terra Genova Italy;

    Istituto Superiore per la Protezione e Ricerca Ambientale (ISPRA) III Dipartimento Tutela degli Habitat e della Biodiversità Marina Roma Italy;

    Università degli Studi di Pisa Dipartimento di Biologia Pisa Italy;

    Universitat Pompeu Fabra Barcelona Spain;

    Università degli Studi di Pisa Dipartimento di Biologia Pisa Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Corallium rubrum; deep sublittoral zone; demographic structure; Mediterranean Sea; precious corals; ROV imaging;

    机译：红花珊瑚;深部沿海沿带;人口结构;地中海;珍贵珊瑚;ROV成像;

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