Influences of sea ice on eastern Bering Sea phytoplankton -- Journal of Oceanology and Limnology,2015,33(2):458-467

	Cite this paper:
	ZHOU Qianqian, WANG Peng, CHEN Changping, LIANG Junrong, LI Bingqian, GAO Yahui. Influences of sea ice on eastern Bering Sea phytoplankton[J]. Journal of Oceanology and Limnology, 2015, 33(2): 458-467

Influences of sea ice on eastern Bering Sea phytoplankton

ZHOU Qianqian¹, WANG Peng^1,2, CHEN Changping¹, LIANG Junrong¹, LI Bingqian^1,3, GAO Yahui^1,4

1 School of Life Sciences and Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361005, China;
2 Tianjin International Joint Academy of Biotechnology and Medicine, Tianjin 300457, China;
3 Salt Research Institute China National Salt Industry Corporation, Tianjin 300450, China;
4 State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

Abstract:

The influence of sea ice on the species composition and cell density of phytoplankton was investigated in the eastern Bering Sea in spring 2008. Diatoms, particularly pennate diatoms, dominated the phytoplankton community. The dominant species were Grammonema islandica (Grunow in Van Heurck) Hasle, Fragilariopsis cylindrus (Grunow) Krieger, F. oceanica (Cleve) Hasle, Navicula vanhoeffenii Gran, Thalassiosira antarctica Comber, T. gravida Cleve, T. nordenskiöeldii Cleve, and T. rotula Meunier. Phytoplankton cell densities varied from 0.08×10⁴ to 428.8×10⁴ cells/L, with an average of 30.3×10⁴ cells/L. Using cluster analysis, phytoplankton were grouped into three assemblages defi ned by ice-forming conditions: open water, ice edge, and sea ice assemblages. In spring, when the sea ice melts, the phytoplankton dispersed from the sea ice to the ice edge and even into open waters. Thus, these phytoplankton in the sea ice may serve as a "seed bank" for phytoplankton population succession in the subarctic ecosystem. Moreover, historical studies combined with these results suggest that the sizes of diatom species have become smaller, shifting from microplankton to nannoplankton-dominated communities.

Key words: phytoplankton|sea ice|Bering Sea|community structure

Received: 2014-01-19 Revised: 2014-03-10

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