2019年春季孟加拉湾中部放射虫群落结构垂向变化*

doi:10.11978/2022209

Abstract

Abstract:

By staining with Rose Bengal and using traditional morphological analysis, this study for the first time reveals the vertical changes of radiolarian community (Polycystinea, Acanthadaria, Taxopodia and Phaeodaria) from 0 to 2600m water depth in the central Bay of Bengal. Polycystinea may survive in full water depth, and the highest abundance is in the chlorophyll-a maximum layer, indicating that most Polycystinea prefers the well-lit and nutrient-rich environments. In the intermediate-deep water (200~1000 m) invaded by high saline water from the Arabian Sea, the change of abundances of living and dead Polycystinea are slight, indicating that they prefer high-salinity environment (>34.5‰). Considering that living Polycystinea did not change significantly from 1000m to 2000m, the abundance of the shells was obviously increased compared with that in the upper water, indicating that the central Bay of Bengal was affected by the lateral advection of ocean current in the 1000~2000m during the sampling period. The highest abundance of Acantharia appeared at 50~100m, then decreased sharply at 100~200m depth, and almost absent at 200~2600m. The number of shells from 0 to 200m was low, suggesting that Acantharia prefers the well-lit and nutrient-rich environments, and is speculated to be largely dissolved at ~100m depth. Different from other species in morphology, a new species Sticholonche indicum sp. nov. was described, which has the significantly longer oar-like axopodia. And its maximum abundance occurs between 200~300m, suggesting that they are new species, which prefer the moderate temperature and high salt environment, not limited by the oxygen minimum zone (OMZ). Phaeodaria mainly lives at a depth of 50m, with the highest abundance at 200~300m depth, the low abundance at 300~2600m depth, and the rare shells of thanatocoenoses at 0~2600m depth, suggesting that Phaeodaria is weakly affected by the OMZ, and some phaeodarian species can live in deep water without the limit of low temperature. Therefore, Polycystinea, Acantharia, Taxopodia and Phaeodaria have the significant differences in vertical distribution and environmental adaptation characteristics, and the above results would be helpful to understand the material cycle and environmental changes in marine ecosystems.

Key words: Bay of Bengal, zooplankton radiolaria, community structure, depth change

ZHANG Lanlan, CHENG Xiawen, XIANG Rong, QIU Zhuoya, CHANG Hu. Changes of radiolarian community structure with depth in the central Bay of Bengal in spring 2019[J].Journal of Tropical Oceanography, 2023, 42(4): 166-175.

Figures/Tables 6

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Changes of radiolarian community structure with depth in the central Bay of Bengal in spring 2019

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