期刊
CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
卷 33, 期 2, 页码 458-467出版社
SCIENCE PRESS
DOI: 10.1007/s00343-015-3367-8
关键词
phytoplankton; sea ice; Bering Sea; community structure
资金
- National Natural Science Foundation of China [41276128, 41476116]
- National Basic Research Program of China (973 Program) [2010CB428704]
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. nordenskioeldii Cleve, and T. rotula Meunier. Phytoplankton cell densities varied from 0.08x10(4) to 428.8x10(4) cells/L, with an average of 30.3x10(4) cells/L. Using cluster analysis, phytoplankton were grouped into three assemblages defined 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.
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