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Polycystine radiolarians in surface sediments from the Bering Sea Green Belt area and their ecological implication for paleoenvironmental reconstructions

【标题】Polycystine radiolarians in surface sediments from the Bering Sea Green Belt area and their ecological implication for paleoenvironmental reconstructions

【Title】Polycystine radiolarians in surface sediments from the Bering Sea Green Belt area and their ecological implication for paleoenvironmental reconstructions

【作者】 王汝建; 肖文申; 陈荣华

【Author】 Wang Rujian ; Xiao Wenshen ; Chen Ronghua

【期刊】Marine Micropaleontology

【Journal】Marine Micropaleontology

【期刊年份】2006

【卷】59

【期】3-4

【关键词】 radiolarian assemblage; depth distribution pattern; surface productivity; Bering Sea Green Belt; surface sediments; Bering Sea

【Keywords】 radiolarian assemblage; depth distribution pattern; surface productivity; Bering Sea Green Belt; surface sediments; Bering Sea

【摘要】Radiolarians in surface sediments along transects from the shelf edge, along the slope into the deep basin of the northern Bering Sea are dominated by Stylochlamydium venustum, Antarctissa? sp. 1, the Spongodiscidae (juvenile), Pseudodictyophimus gracilipes, Ceratospyris borealis, the Plagoniidae (Phormacantha group and Plectacantha group), Siphocampe arachnea, Cycladophora davisiana and Spongotrochus glacialis. This dominance is most extreme on the shelf edge and slope, where S. venustum, Antarctissa? sp. 1, the Spongodiscidae (juvenile), the Plagoniidae and S. glacialis have their highest relative abundance. There is thus a close relation between radiolarian distribution and the high productivity of the “Bering Sea Green Belt” (BSGB) due to periodic sea ice melt. The radiolarian depth distribution patterns indicate that some radiolarian species have specific ecological preferences. S. venustum, the Spongodiscidae (juvenile), and S. glacialis live close to the surface water under relatively low-temperature and low-salinity conditions due to sea ice melting or melt water influx. Antarctissa? sp. 1 appears to dwell mainly in surface to subsurface waters, but has not been recorded in trap samples of the Bering Sea. The Plagoniidae probably live in subsurface and intermediate waters. S. arachnea and C. davisiana are intermediate to deep dwellers. The close association of these radiolarians with the BSGB and specific water depths provides a valuable reference for paleoenvironmental reconstruction in the region.

【Abstract】Radiolarians in surface sediments along transects from the shelf edge, along the slope into the deep basin of the northern Bering Sea are dominated by Stylochlamydium venustum, Antarctissa? sp. 1, the Spongodiscidae (juvenile), Pseudodictyophimus gracilipes, Ceratospyris borealis, the Plagoniidae (Phormacantha group and Plectacantha group), Siphocampe arachnea, Cycladophora davisiana and Spongotrochus glacialis. This dominance is most extreme on the shelf edge and slope, where S. venustum, Antarctissa? sp. 1, the Spongodiscidae (juvenile), the Plagoniidae and S. glacialis have their highest relative abundance. There is thus a close relation between radiolarian distribution and the high productivity of the “Bering Sea Green Belt” (BSGB) due to periodic sea ice melt. The radiolarian depth distribution patterns indicate that some radiolarian species have specific ecological preferences. S. venustum, the Spongodiscidae (juvenile), and S. glacialis live close to the surface water under relatively low-temperature and low-salinity conditions due to sea ice melting or melt water influx. Antarctissa? sp. 1 appears to dwell mainly in surface to subsurface waters, but has not been recorded in trap samples of the Bering Sea. The Plagoniidae probably live in subsurface and intermediate waters. S. arachnea and C. davisiana are intermediate to deep dwellers. The close association of these radiolarians with the BSGB and specific water depths provides a valuable reference for paleoenvironmental reconstruction in the region.

【基金/项目】 the Ministry of Finance of China and organized by the Chinese Arctic and Antarctic Administration (CAA) ; 2006年极地优秀论文三等奖 ; 地球圈层相互作用中的深海过程和深海记录 ; 西太平洋暖池与东亚古环境:沉积记录的海陆对比 ; 白令海晚第四纪古海洋学记录及其对全球气候变化的响应 ; 北冰洋晚第四纪古海洋学记录及其对北半球冰盖变化的响应

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