极地研究2012，Vol.24Issue(1)：15-23,9.DOI:10.3724/SP.J.1084.2012.00015
白令海和楚科奇海表层沉积硅藻分布特征
THE DISTRIBUTION OF SURFACE SEDIMENT DIATOMS IN THE BERING SEA AND CHUKCHI SEA
摘要
Abstract
Diatoms from surface sediment samples in the Bering Sea and Chukchi Sea were analyzed to reveal the distri-bution pattern of the surface sediment diatoms and their relationship with the ocean environment. Diatom was found to be absent in sediment samples from north of the Arctic Sea Ice Minimum, showing the growth and reproduction of diatoms are strongly inhibited by sea ice. In areas between the Arctic Sea Ice Minimum and Maximum, I. E. Areas influenced by seasonally changed sea ice, the sea ice diatoms ( mainly Fragilariopsis oceanica and Fragilariopsis cy-lindrus ) was found to be the dominant diatom species. Arctic sea ice was therefore confirmed to be an important influencing factor for surface sediment diatoms in the Bering and Chukchi Seas. The Chaetoceros resting spores were more abundant in the Chukchi Sea than the Bering Sea, which was coincident with the composition of modern phy-toplankton in these areas, and can possibly be attributed to stronger hydrodynamic condition in the Bering Sea. This species was least abundant on the northeast Bering shelf, possibly because of the lower water depth, stronger effect of the coastal current and river influx, relatively coarser sediment particles, and relatively strong wind and bottom current. The Arctic diatom group (dominated by Bacterosira bathyomphala, Thalassiasira antarctic v. Borealis and Thalassiosira antarctic resting spore) was more abundant in the Bering basin and the central and north Chukchi Sea, while the coastal benthic diatom group (including Paralia sulcata and Delpheneis surirella) was mainly found on the northeast Bering Shelf and near Cape Lisburne in the Chukchi Sea. Thalassisira nordenskioledii was most plentiful nearby the Bering Strait, and Neodenticula saminae was only found in the Bering Sea, especially in the Bering basin, indicating close correlation with the Pacific waters.关键词
白令海/楚科奇海/表层沉积/硅藻Key words
Bering Sea/Chukchi Sea/surface sediment/diatom引用本文复制引用
冉莉华,陈建芳,金海燕,李宏亮,卢勇,王奎..白令海和楚科奇海表层沉积硅藻分布特征[J].极地研究,2012,24(1):15-23,9.基金项目
国家海洋局极地科学重点实验室开放研究基金资助项目(KP2008003)、国家海洋局第二海洋研究所基本科研业务费专项资金项目(JG0908)、国家自然科学基金项目(41076135)、国家自然科学基金项目(41003036)和中国极地战略研究基金(20080213)资助 （KP2008003）
