南红海Al-Bawadi岛沿岸底栖有孔虫的分布和多样性

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
Ahmed Badreldin, Mohamed Mohamed Abdu Makbool, Mohamed Abdu ElSabrouti, Pamela M. Hallock
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引用次数: 0

摘要

红海南部岛屿的沿海地区是非城市化的,相对原始的环境,位于印度-太平洋有孔虫物种通过苏伊士运河向红海北部和地中海迁移的主要途径上。研究红海有孔虫的组成、结构和分布对于了解印度洋-太平洋物种如何迁移到地中海并在地中海生存至关重要。位于红海南部的无人岛Al-Bawadi是进行此类研究的理想地点。沿海水域是低营养、高盐和非常温暖的,覆盖着富含碳酸盐的砂底和珊瑚礁基底。在25个沉积物样本中,深度4的样本大部分来自bbb30 m,表明水质适合珊瑚礁的生长和恢复。多样性指数反映了当时的正常海洋到高盐环境。深度、珊瑚礁的存在和水动力是控制有孔虫组合空间分布的主要因素。在潮滩地区出现异常试验可能与自然发生的应力有关,例如温度和盐度的迅速变化,或者与破损和修复有关。对未受威胁环境的监测研究对于了解与珊瑚礁相关的组合以及预测耐热和热敏有孔虫物种的迁移途径至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Distribution and Diversity of Benthic Foraminifera in the Coastal Area of Al-Bawadi Island, Southern Red Sea
The coastal areas of the southern Red Sea islands are non-urbanized, relatively pristine environments and are located on the main migration pathway of Indo-Pacific foraminiferal species to the northern Red Sea and to the Mediterranean Sea via the Suez Canal. Studying the foraminiferal composition, structure, and distribution in the Red Sea is essential to understanding how Indo-Pacific species can migrate to and survive in the Mediterranean Sea. Al-Bawadi, an uninhabited island located in the southern Red Sea, is an ideal location for such study. The coastal waters are oligotrophic, hypersaline, and very warm, overlying carbonate-rich, sandy-bottom and coral-reef substrata. In 25 sediment samples collected from water depths <6 m, 79 foraminiferal species were recorded. Rotaliids dominated the assemblages, followed by miliolids; agglutinated foraminifers were scarce, and planktic species were not found. The larger-benthic, symbiont-bearing Neorotalia calcar dominated except in very shallow water, where smaller, free-living miliolid species dominated. The FoRAM Index (FI) was calculated for all samples; the symbiont-bearing group included seven genera comprising more than half of the total assemblage such that the FI>4 for most samples from depths >3 m, indicating that water quality is suitable for coral-reef growth and recovery. Diversity indices reflected prevailing normal marine to hypersaline conditions. Depth, presence of coral reefs, and hydrodynamics are the main factors controlling the spatial distribution of the foraminiferal assemblages. Occurrences of aberrant tests in the tidal flat area could be related to naturally occurring stresses, such as rapid changes in temperature and salinity, or to breakage and repair. Monitoring studies of unthreatened environments are essential to understand reef-related assemblages and to predict the migration pathways of thermo-tolerant and thermo-sensitive foraminiferal species.
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
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