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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】 Rujian Wang; Wenshen Xiao; Qianyu Lia; Ronghua Chen

【Author】

【期刊】Marine Micropaleontology

【Journal】

【期刊年份】2006

【卷】59(3-4)

【期】

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

【Keywords】

【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) ; the NKBRSF (Grant No. G2000078500) and the National Natural Science Foundation of China (Grant No. 40321603 ; 40276020 and 40576029) ; the Foundation for the Author of National Excellent Doctoral Dissertation of the People's Republic of China (Project No. 200126) ; 2006年极地优秀论文三等奖

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