古巴(墨西哥湾)西北坡底栖大型动物的多样性基线

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

摘要

墨西哥湾(GoM)因其物理特征而成为一个独特的生态系统,它北受密西西比河影响,南受环流影响,因此沉积物成分从北到南呈有机物到碳酸盐的梯度分布。一般来说,对地中海北部和西南部的大陆坡研究较多,但对地中海东南部沿古巴坡的研究较少。为填补这一知识空白,2017 年在 9 个站点(974-1580 米深)采集了沉积物岩心,以确定深海底栖大型动物群落的非生物控制。海洋学数据表明,水柱分层,属于典型的寡营养海洋,没有缺氧迹象。沉积物的质地和成分显示出西高东低的梯度,这可能是由东部地区陆生物质的下坡迁移和西部地区碳酸盐比例较高决定的。重金属(铜、汞、铅和锌)的浓度已知会对底栖生物造成不利影响,这些重金属出现在东部哈瓦那市附近,大型底栖生物群落显示出环境压力的特征。总体而言,该区域的大型底栖生物群落种类繁多,但丰度较低,通常只有 1-2 种动物,各站内重复样本之间的差异较大。稀有度曲线显示,与深度相近的 nGoM 样本相比,古巴样本的单位个体数量生物多样性更高,但需要更多的样本才能更好地揭示真实的多样性。影响古巴西北部大陆坡大型底栖生物群落的主要因素很可能是缺乏富含有机质的沉积物和沉积物沉积率低,这两个因素都可归因于强大的洋流和缺乏主要的土著输入,以及定期的自然扰动,从而防止了统治。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A diversity baseline of benthic macrofauna along the northwestern slope of Cuba (Gulf of Mexico)

The Gulf of Mexico (GoM) is a unique ecosystem due to its physical characteristics, being influenced by the Mississippi River in the north and the Loop Current from the south, resulting in a gradient of organic to carbonate sediment composition from north to south. The continental slope of the northern and southwestern portions of the GoM are generally well studied; however, less is known about the southeastern GoM along the slope of Cuba. To fill this knowledge gap, sediment cores were collected in 2017 at nine stations (974–1580 m depth) to determine abiotic controls on the deep-sea benthic macrofauna community. Oceanographic data indicated a stratified water column typical of an oligotrophic ocean and no evidence of hypoxia. Sediment texture and composition indicated a west-east gradient likely determined by downslope transport of terrigenous material in the eastern part with a high proportion of carbonate in the west. Heavy metals (Cu, Hg, Pb, and Zn) at concentrations known to cause adverse benthic effects were present in the east near the city of Havana, with the macrofauna community showing characteristics indicative of environmental stress. Overall, this region supported a diverse community of macrofauna families of low abundance, typically only 1–2 animals, and high variability among replicates within stations. Rarefaction curves revealed higher biodiversity per number of individuals in the samples from Cuba compared to those from the nGoM at similar depths, though more samples would be needed to better reveal the true diversity. The major factors influencing macrofauna communities in the continental slope off northwestern Cuba are most likely the lack of organic-rich sediment and low sediment deposition rates, both of which can be attributed to the strong currents and lack of major terrigenous input, along with the regular natural disturbances which prevents domination.

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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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