The distribution of diatom species from surface sediments of characteristic regions in the Bering Sea and their paleoceanographical significance

HUANG Yuanhui; SHI Xuefa; LV Huahua; CHEN Zhihua; CHENG Zhenbo

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HUANG Yuanhui, SHI Xuefa, LV Huahua, CHEN Zhihua, CHENG Zhenbo. The distribution of diatom species from surface sediments of characteristic regions in the Bering Sea and their paleoceanographical significance[J]. Haiyang Xuebao, 2012, 34(3): 106-113.

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The distribution of diatom species from surface sediments of characteristic regions in the Bering Sea and their paleoceanographical significance

Key Laboratory of State Oceanic Administration for Marine Sedimentology & Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

Received Date: 2010-10-09
Rev Recd Date: 2011-06-20

Abstract

Abstract

Diatom analyses were conducted on 13 surface sediment samples from the Bering Sea. A total of 56 species and varieties belonging to 30 genera were identified, among which 17 ones were documented from the Bering Sea for the first time, including three fossil taxa such as Kisseieviella carina. The dominant species were Neodenticula seminae, Fragilariopsis cylindrus and Fragilariopsis oceanica, with N. seminae dominated the vicinity of continental slope and the other two species dominated the northern continental shelf respectively. According to the results of cluster analysis, three diatom assemblages could be distinguished from the Bering Sea, which represented a sea-ice diatom assemblage, a pelagic planktonic diatom assemblage under strong influence of the Alaskan Stream and a transitional diatom assemblage.Fossula arctica is one of the 17 new records of diatom species from the Bering Sea with a distributional trend similar to that of F. cylindrus and F. oceanica, which amounts to 11.7%~17.1% on the northern continental shelf and sharply decreases on the adjacent parts of northern continental slope, so it is presumed to be another effective indicator of sea-ice variation other than F. cylindrus and F. oceanica, which can hopefully play an important role in study of late Quaternary sea-ice history in the Bering Sea.
- diatom,
- sea ice,
- subarctic,
- Bering Sea

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References

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