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Composition and distribution of diatom assemblages in the surface sediments of the Bering Sea

【标题】Composition and distribution of diatom assemblages in the surface sediments of the Bering Sea

【Title】Composition and distribution of diatom assemblages in the surface sediments of the Bering Sea

【DOI】10.3724/SP.J.1085.2013.00167

【作者】 GAO Yahui& 林荣澄; 黄丁勇; 邵丽霞

【Author】 Lin Rongcheng ; Huang Dingyong ; SHAO Lixia

【期刊】极地研究

【Journal】ADVANCES IN POLAR SCIENCE

【期刊年份】2013

【卷】24

【期】3

【关键词】 Bering Sea; surface sediment; diatom; species composition; distribution

【Keywords】 Bering Sea; surface sediment; diatom; species composition; distribution

【摘要】 Diatoms collected from the top 1 cm of the surface sediment layer at seven Bering Sea stations during the Fourth Chinese National Arctic Research Expedition (4th CHINARE-Arctic) in 2010 were studied. In total, 101 taxa belonging to 38 genera were found. The species were divided into four groups: eurythermal species, boreal-temperate species, polar species, and sea-ice species. The diatom assemblages at the stations in the southwestern basin area were primarily composed of boreal-temperate species, such as Neodenticula seminae, Thalassiosira trifulta, Rhizosolenia hebetata f. hiemalis, and Actinocyclus curvatulus. The northeastern shelf stations were dominated by polar species, including Fragilariopsis oceanica, Thalassiosira antarctica spora, Thalassiosira nordenskioeldii, and Thalassiosira hyalina. The overall abundance was highest at the basin stations with 3.7 ×106 cells?g-1 of wet sediment, whereas the eastern shelf stations had the lowest abundance of 0.7×106 cells?g-1 of wet sediment (excluding the resting spores of Chaetoceros spp.). The relationship between the distribution of the surface sediment diatom assemblages and the environment is discussed.

【Abstract】Diatoms collected from the top 1 cm of the surface sediment layer at seven Bering Sea stations during the Fourth Chinese National Arctic Research Expedition (4th CHINARE-Arctic) in 2010 were studied. In total, 101 taxa belonging to 38 genera were found. The species were divided into four groups: eurythermal species, boreal-temperate species, polar species, and sea-ice species. The diatom assemblages at the stations in the southwestern basin area were primarily composed of boreal-temperate species, such as Neodenticula seminae, Thalassiosira trifulta, Rhizosolenia hebetata f. hiemalis, and Actinocyclus curvatulus. The northeastern shelf stations were dominated by polar species, including Fragilariopsis oceanica, Thalassiosira antarctica spora, Thalassiosira nordenskioeldii, and Thalassiosira hyalina. The overall abundance was highest at the basin stations with 3.7 ×106 cells?g-1 of wet sediment, whereas the eastern shelf stations had the lowest abundance of 0.7×106 cells?g-1 of wet sediment (excluding the resting spores of Chaetoceros spp.). The relationship between the distribution of the surface sediment diatom assemblages and the environment is discussed.

【基金/项目】 北极海域海洋生物和生态考察 ; 北极常见海洋生物信息提取及应用研究

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