热带东南印度洋春季硅质放射虫残骸群的深度梯度变化*

doi:10.11978/YG2025004

Abstract

Abstract:

Enhanced observation and research on the vertical settling gradient variation of siliceous radiolarian remains, an important component of marine settling particles, is conducive to understanding the deep-sea silicon cycle process and the indicative significance of radiolarians in paleoceanographic environmental reconstruction. This study selected two deep-sea regions in the tropical southeastern Indian Ocean. Utilizing a Maxi multinet plankton sampler, continuous stratified sampling of the 0-3000 m water column was conducted across nine layers. Based on the Rose Bengal staining method combined with traditional morphological analysis, this research systematically reveals, for the first time, the settling patterns of siliceous radiolarian remains at different water depths in this region. Vertically, the layer with the highest abundance of radiolarian remains occurs either within or directly below the layer with the highest abundance of living radiolarians. The entire settling process consistently displays a three-layer differentiation pattern for radiolarian remains: the shallow layer serves as the accumulation zone, the middle layer constitutes the stable settling zone, and the deep layer functions as the dissolution zone. Spumellarian dominant species exhibit high stability and strong resistance to dissolution during vertical settling, whereas nassellarian content decreases with increasing water depth, particularly in deeper layers. Regionally, variations in radiolarian remains abundance are related not only to their productivity but also local hydrodynamic environments. For instance, at the southern station, the density, species number, and diversity of remains within the 100-2000 m depth interval are significantly higher than those at the equatorial station, closely corresponding to higher living radiolarian productivity. However, within the 2000-3000 m deep water layer, radiolarian density at the southern station is lower than at the equatorial station, which is potentially related to the lateral transport by deep-water dynamics. The quantitative data on radiolarian remains collected in this study will provide crucial observational evidence and scientific support for estimating radiolarian silicon export flux and its biological pump effect in the tropical eastern Indian Ocean.

Key words: tropical Indian Ocean, dead radiolarians, depth profile, gradient change, sedimentation pattern

CLC Number:

Q913

ZHANG Lanlan, LI Tong, CHENG Xiawen, PERERA Batagoda Gamage Dumudu Ojitham, XIANG Rong. Depth gradient changes in dead polycystine radiolarians in the tropical southeastern Indian Ocean during spring^*[J].Journal of Tropical Oceanography, 2026, 45(1): 60-72.

Figures/Tables 7

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Depth gradient changes in dead polycystine radiolarians in the tropical southeastern Indian Ocean during spring^*

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Depth gradient changes in dead polycystine radiolarians in the tropical southeastern Indian Ocean during spring*

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Depth gradient changes in dead polycystine radiolarians in the tropical southeastern Indian Ocean during spring^*