巴哈马海洋舌头和埃克苏马湾黄昏区群落组成和有机碳通量

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY
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引用次数: 0

摘要

加勒比海的海洋环境中有几个大型深海盆地,但对它们的调查仍然很少。在此,我们报告了对巴哈马群岛两个深海盆地--大洋之舌(n = 18 次部署)和埃克苏马湾(n = 11 次部署)--部署在 262 米至 1100 米深处的远程深海视频着陆器所吸引的底栖动物群落的观察结果。视频包括>5年(2018-2022年)8000分钟的调查数据。我们利用卫星观测数据和 POC 随深度衰减模型估算了区域深海颗粒有机碳通量(POC),以评估生活在这些盆地 800 米以上深处的底栖生物群落的潜在食物可用性。底栖有机碳通量有助于了解根据着陆器测量结果估算的动物生物多样性和丰度的潜在驱动因素。在巴哈马群岛的整个暮光区深度(此处定义为大约 200-1000 米),我们确定了无脊椎动物、鳍鱼类和鞘鱼类中 22 个科的类群。动物群落主要以巨型等脚类动物(Bathynomus sp.)、大口鲨(Centrophorus sp.)和游泳海参(Enypniastes eximia)为主。尽管取样偏向于较大个体,但我们的研究结果表明,巴哈马群岛黄昏区群落由多种大型食肉动物组成,这些大型食肉动物可能通过与浅海有机碳源的高能量连接而得以维持。我们的研究结果表明,由于缺乏历史取样,加之向深海出口的生产力较高,海洋中南部舌部应成为未来取样工作的重点。这项研究为了解加勒比深海生态系统的群落组成、组合结构和 POC 通量提供了新的视角,揭示了以前未认识到的生物多样性模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Community composition and organic carbon flux in twilight zone communities of The Tongue of the Ocean and Exuma Sound, The Bahamas

Caribbean ocean environments house several large deep-sea basins that remain poorly surveyed. Here we report observations of benthic faunal communities attracted to remote, deep-sea video landers deployed at depths between 262 and 1100 m in two deep basins in The Bahamas, the Tongue of the Ocean (n = 18 deployments) and Exuma Sound (n = 11 deployments). The video comprises >8000 min of survey data across five years of sampling (2018–2022). We estimated regional deep-sea particulate organic carbon (POC) flux using satellite-derived observations and a model of POC decay with depth to assess potential food availability to benthic communities living deeper than 800 m in these basins. The benthic POC flux helped to contextualize potential drivers of faunal biodiversity and abundances estimated from the lander measurements. Throughout twilight zone depths of The Bahamas (defined here as approximately 200–1000 m) we identified taxa from 22 families across invertebrates, teleost fishes, and elasmobranchs. Faunal communities were largely dominated by giant isopods (Bathynomus sp.), gulper sharks (Centrophorus sp.), and swimming sea cucumbers (Enypniastes eximia). Despite sampling biases toward larger individuals, our findings suggest that Bahamian twilight zone communities comprise a diversity of large predator species that are potentially sustained through high energetic connectivity with shallow neritic sources of organic carbon. Our findings suggest that the Central and Southern Tongue of the Ocean should be the focus of future sampling efforts given a lack of historical sampling combined with high export productivity to depth. This study provides new insight into community composition, assemblage structure, and POC flux in Caribbean deep-sea ecosystems, shedding light on previously unrecognized patterns of biodiversity.

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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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