东北印度洋海岭区表层沉积物底栖有孔虫分布特征及其影响因素初探*

doi:10.11978/2024245

热带海洋学报 ›› 2026, Vol. 45 ›› Issue (1): 81-90.doi: 10.11978/2024245CSTR: 32234.14.2024245

东北印度洋海岭区表层沉积物底栖有孔虫分布特征及其影响因素初探^*

钟福昌(), 向荣(), 杨艺萍, 毛华斌

热带海洋环境与岛礁生态全国重点实验室(中国科学院南海海洋研究所), 广东广州 511458

收稿日期:2024-12-31 修回日期:2025-01-15 出版日期:2026-01-10 发布日期:2026-01-30
通讯作者: 向荣。email: rxiang@scsio.ac.cn
作者简介:
钟福昌(1992—), 男, 福建省长汀县人, 工程师, 从事海洋沉积环境研究。email: zhongfuchang@scsio.ac.cn
*致谢: 本研究的样品由中国科学院南海海洋研究所“实验1”“实验3”“实验6”科考船执行的国家自然科学基金共享航次(航次编号: NORC2015-10、NORC2018-10、NORC2021-10、NORC2022-10 + NORC2022-303、NORC2023-10 + NORC2023-303)采集, 感谢参加各航次的全体船员和科学家为获取研究样品所付出的努力。感谢三位审稿专家宝贵的意见和建议
基金资助:
中国科学院青年促进会(2022350); 广东省粤穗联合基金青年基金项目(2022A1515111023); 国家自然科学基金项目(42176082); 国家自然科学基金项目(42376074); 国家自然科学基金共享航次计划项目(41449910); 国家自然科学基金共享航次计划项目(41749910); 国家自然科学基金共享航次计划项目(42049910); 国家自然科学基金共享航次计划项目(42149910); 国家自然科学基金共享航次计划项目(42249910)

Distribution characteristics and influencing factors of benthic foraminifera in surface sediments of the northeast Indian Ocean Ridge region^*

ZHONG Fuchang(), XIANG Rong(), YANG Yiping, MAO Huabin

State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 511458, China

Received:2024-12-31 Revised:2025-01-15 Online:2026-01-10 Published:2026-01-30
Contact: XIANG Rong. email: rxiang@scsio.ac.cn
Supported by:
Youth Innovation Promotion Association CAS(2022350); Natural Science Foundation of Guangdong Province(2022A1515111023); National Natural Science Foundation of China(42176082); National Natural Science Foundation of China(42376074); Shiptime Sharing Project of National Natural Science Foundation of China(41449910); Shiptime Sharing Project of National Natural Science Foundation of China(41749910); Shiptime Sharing Project of National Natural Science Foundation of China(42049910); Shiptime Sharing Project of National Natural Science Foundation of China(42149910); Shiptime Sharing Project of National Natural Science Foundation of China(42249910)

摘要/Abstract

摘要：

印度洋90°E海岭区具有复杂而独特的地形特征, 为深入了解海岭区不同部位底栖生物生态特征、区域生物生产力及陆源输入影响, 对东北印度洋海岭区13个表层沉积物样品中大于150μm壳径的底栖有孔虫组合进行了定量分析。研究发现该区底栖有孔虫以150~250μm粒径为主, 相对丰度为60%~84%; 大于250μm壳径粒级的底栖有孔虫相对丰度较低, 为16%~40%。优势底栖有孔虫属种以表生种和中浅内生种为主。壳体组成以玻璃质壳为主, 胶结质壳次之, 瓷质壳含量最低。底栖有孔虫主要属种组成没有明显差异, 但其绝对丰度、三大类壳体组成和表/内生种的分布仍表现出一定的区域差异: 底栖有孔虫丰度在海岭北部两侧相对较高, 海岭上相对较低; 研究区东北侧的胶结壳相对含量在明显高于其他区域; 在海岭中部, 胶结质底栖有孔虫含量随水深的增加而上升, 其壳壁建造所选颗粒在东北部以碎屑矿物为主。综合分析认为, 东北印度洋海岭区底栖有孔虫主要受陆源物质输运、表层生产力分布和水深变化引起的溶解作用的共同影响。此外, 我们首次注意到在大于250μm的组分中, 所有站位表生种含量远大于内生种, 推测这是底栖有孔虫对高氧生态环境适应演化的结果。

关键词: 表层沉积物, 底栖有孔虫, 90°E海岭, 印度洋

Abstract:

The northeastern Indian Ocean Ridge area along the 90°E meridian exhibits complex and unique topographic features. To gain deeper insights into the benthic ecological characteristics, regional biological productivity, and terrigenous input influences across different parts of the ridge, a comprehensive identification and statistical analysis of benthic foraminifera (> 150 μm) was conducted on 13 surface sediment samples from this region. The study revealed that benthic foraminifera in the 150-250 μm size fraction dominated the area, with relative abundances of 60% to 84%, while the fraction larger than 250 μm exhibited lower relative abundances of 16% to 40%. The dominant benthic foraminiferal species were primarily epifaunal and shallow infaunal types. Among the three major benthic foraminiferal shell types, hyaline shells predominated, followed by agglutinated shells, with porcellaneous shells being the least abundant. Although no significant differences in dominant species were observed among stations, distinct regional variations emerged in shell-type proportions and epifaunal or infaunal distributions: the abundance of benthic foraminifera is relatively high on both sides of the northern ridge and relatively low on the ridge itself; the relative content of agglutinated benthic foraminifera is significantly higher in the northeastern side of the study area compared to other areas, and increases with water depth in the central part of the Indian Ocean Ridge. The particles selected for the construction of the shell walls of agglutinated benthic foraminifera are mainly composed of detrital minerals in the northeast, while multi-species planktic foraminifera have been used to build their tests in the central part of the Indian Ocean Ridge. Analysis suggests that benthic foraminifera in the northeast Indian Ocean Ridge area are mainly influenced by the transport of terrestrial materials, surface productivity distribution, and dissolution caused by changes in water depth. In addition, we note for the first time that the content of surface species is much higher than that of epifaunal species in the components larger than 250 μm. We believe this is the result of the adaptive evolution of benthic foraminifera to high-oxygen ecological environments.

Key words: surface sediment, benthic foraminifera, 90°E Ridge, Indian Ocean

中图分类号:

P736.2

钟福昌, 向荣, 杨艺萍, 毛华斌. 东北印度洋海岭区表层沉积物底栖有孔虫分布特征及其影响因素初探^*[J]. 热带海洋学报, 2026, 45(1): 81-90.

ZHONG Fuchang, XIANG Rong, YANG Yiping, MAO Huabin. Distribution characteristics and influencing factors of benthic foraminifera in surface sediments of the northeast Indian Ocean Ridge region^*[J]. Journal of Tropical Oceanography, 2026, 45(1): 81-90.

图/表 7

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东北印度洋海岭区表层沉积物底栖有孔虫分布特征及其影响因素初探^*

Distribution characteristics and influencing factors of benthic foraminifera in surface sediments of the northeast Indian Ocean Ridge region^*

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东北印度洋海岭区表层沉积物底栖有孔虫分布特征及其影响因素初探*

Distribution characteristics and influencing factors of benthic foraminifera in surface sediments of the northeast Indian Ocean Ridge region*

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东北印度洋海岭区表层沉积物底栖有孔虫分布特征及其影响因素初探^*

Distribution characteristics and influencing factors of benthic foraminifera in surface sediments of the northeast Indian Ocean Ridge region^*