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Community structure comparisons of lower slope hydrocarbon seeps, northern Gulf of Mexico

机译:墨西哥湾北部下坡油气渗流群落结构比较

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摘要

Photographic sampling collected from ROV JASON III on randomized transects (generally 10 per site) was used to compare seven suspected hydrocarbon seeps on the lower continental slope at depths of 956 to 2330 m. The study design focused on areas containing high-amplitude reflectance patterns in seismic returns from the bottom. Animal samples nested in these areas and high-resolution photographic mosaics permitted fine-scale description of the community components and their associations with each other. The transect results showed three types of chemosynthetic community: carbonate prone, brine pool prone, and low-density. These communities are characterized by, respectively, abundant carbonate rubble and tubeworm clusters, bacterial mats and brine pools, and relatively sparse chemosynthetic fauna that tended to be overlooked by the photographic survey plan. These differences were not clearly related to depth or longitude because the sites are at the opposite eastern and western extents of the project region. Photographic survey is a statistically reliable method for detecting the carbonate rubble and bacterial mat types of community, but may be unreliable for sparse or clustered fauna such as seep mussels. Photographic survey results provided relatively low taxonomic resolution, but were sufficient to distinguish statistical differences in the abundance of characteristic faunal groups, such as the Echinoidea and Gorgonacea, associated with hydrocarbon seeps. Initial studies of statistical power indicate that future photographic surveys of suspected seep communities, if conducted with an equivalent level of effort, might detect the presence of more abundant habitat, including carbonate rubble, bacterial mats, and tubeworms, but could miss less abundant indicators.
机译:从ROV JASON III上的随机样点(通常每个站点10个)上收集的照片样本用于比较956至2330 m深度的低陆坡上的七个可疑烃渗漏。研究设计的重点是从底部地震回波中包含高振幅反射率模式的区域。嵌套在这些区域中的动物样本和高分辨率的照片马赛克允许对社区组成及其相互之间的关联进行精细描述。样带结果显示了三种化学合成群落类型:碳酸盐倾向,盐水池倾向和低密度。这些群落的特征分别是丰富的碳酸盐瓦砾和结核虫簇,细菌垫和盐水池,以及相对稀疏的化学合成动物,这些动物往往被摄影调查计划所忽略。这些差异与深度或经度没有明显关系,因为这些站点位于项目区域的相反的东西方范围。摄影调查是一种统计上可靠的方法,可以检测碳酸盐瓦砾和细菌垫类型的群落,但对于稀疏或成簇的动物(如渗水贻贝)可能不可靠。摄影调查结果提供了相对较低的分类学分辨率,但足以区分与碳氢化合物渗漏有关的特征性动物群(例如棘皮and和org草)的统计差异。初步的统计能力研究表明,如果以相同的努力水平,以后对可疑渗水群落的摄影调查,可能会发现存在更丰富的栖息地,包括碳酸盐瓦砾,细菌垫和结核虫,但可能会漏掉较不丰富的指标。

著录项

  • 来源
    《Deep-Sea Research》 |2010年第23期|p.1904-1915|共12页
  • 作者单位

    Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32306-4320, USA;

    Gulf of Mexico Foundation, 5403 Everhart Street, Corpus Christi, TX 78711, USA;

    Department of Statistics, Florida State University, Tallahassee, FL 32306-4330, USA;

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

    hydrocarbon seeps; tubeworms; photographic surveys; Gulf of Mexico;

    机译:碳氢化合物渗漏;虫摄影调查;墨西哥湾;

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