Bathyal benthic megafauna from the Mid-Atlantic Ridge in the region of the Charlie-Gibbs fracture zone based on remotely operated vehicle observations
Bathyal benthic megafauna from the Mid-Atlantic Ridge in the region of the Charlie-Gibbs fracture zone based on remotely operated vehicle observations
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DOI：
10.1016/j.dsr.2018.12.006
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发表时间：
2019-03-01
影响因子：
2.4
通讯作者：
Jones, Daniel O. B.
中科院分区：
文献类型：
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作者：
Alt, Claudia H. S.;Kremenetskaia (Rogacheva), Antonina;Jones, Daniel O. B.
洋中脊是重要的地质特征，覆盖全球约33%的洋底，增加了区域范围内的环境异质性，并影响到海底生物群落生态。在大西洋中脊东部和西部的四个对照地点对海底群落进行了研究，这些地点又被查理-吉布斯断裂带和副极地锋进一步分为北方（北纬54度）和南方（北纬48度）。CCFZ区域的MAR有平坦的区域，周围是岩石悬崖之间的缓坡。在平坦地区和沉积斜坡（10度）共调查了32个遥控潜水器视频断面（32 000平方米的海底）。在所有地点共确定了154个不同的分类单位（来自9门）。平坦和倾斜的网站的沉积物是大致相似的，但在社区组成和动物区系丰度的差异（类似的4倍以上的平坦的网站，除了在西北部网站）。不同地点之间的丰度差异很大（北方地点最高）。两个北方站点有不同的群落组成，而两个南方站点是相似的。这表明，与南部相比，MAR在CGFZ北部的社区之间起到了更强的屏障作用。断面之间的异质性很高，它是不可能确定的底栖巨型动物在MAR的一般驱动程序。我们的研究结果强调有限的知识，这个庞大的系统，其独特的底栖巨型动物。
Mid-ocean ridges are important geological features that cover around 33% of the global ocean floor, increase environmental heterogeneity on a regional scale and influence benthic community ecology. Benthic communities at the Mid-Atlantic Ridge (MAR) were studied at four contrasting sites, located east and west of the ridge, which were further separated into northern (54 degrees N) and southern (48 degrees N) sites by the Charlie-Gibbs Fracture Zone (CGFZ) and the Sub-Polar Front (SPF). The MAR in the CCFZ region area had flat areas surrounded by gentle slopes between rocky cliffs. A total of 32 remotely operated vehicle video transects (32,000 m(2) of seafloor) were surveyed on the flat areas and sedimented slopes (10 degrees). In total, 154 distinct taxonomic units were identified (from 9 phyla) across all sites. The sediments of the flat and sloping sites were generally similar, but differences were seen in the community composition and faunal abundance (similar to 4 times higher in the flat sites, except at the northwestern site). Significant differences in abundance were observed between sites (highest in the northern sites). The two northern sites had distinct community compositions, while the two southern sites were similar. This suggests that the MAR acts as a stronger barrier between communities north of the CGFZ than it does to the south. There was high heterogeneity between transects and it was not possible to identify general drivers for the benthic megafauna at the MAR. Our results emphasize the limited knowledge of this vast system with its unique benthic megafauna.