We evaluated the relationships between water masses and pico- and nano-phytoplankton and bacterial abundance in the Chukchi Sea. The abundance of picoplankton ranged from 0.01 × 103 cells.mL-1 (100 m, station R05) to 2.21 × 103 cells.mL-1 (10 m, station R05) and that of nanoplankton ranged from 0.03 × 103 cells.mL-1 (100 m, station R07) to 2.21 × 104 cells.mL-1 (10 m, station R05). The lowest abundance of bacteria in the whole water column (0.21 × 106 cells.mL-1) was at 100 m at station R17, and the highest (9.61 × 106 cells.mL-1) was at 10 m at station R09. Melting sea ice affected the physical characteristics of the Chukchi Sea by reducing salinity of the surface mixed layer, resulting in greater hydrodynamic stability of the water column. These changes were accompanied by increased bacterial abundance. The warm Pacific water brought nutrients into the Chukchi Sea, resulting in greater abundance of bacteria and nano-phytoplankton in the Chukchi Sea than in other regions of the Arctic Ocean. However, the abundance of pico-phytoplankton, which was related to chlorophyll
RESEARCH-ARTICLE
Spatial distribution of pico-and nano-phytoplankton and bacteria in the Chukchi Sea in relation to water masses

Vol. 23, Issue 4, pp. 237-243 (2012) • DOI
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1. SOA Key Laboratory for Polar Science,Polar Research Institute of China,Shanghai 200136,China;
2. College of Food Science & Technology,Shanghai Ocean University,Shanghai 201306,China;
3. College of Fisheries and Life Science,Shanghai Ocean University,Shanghai 201306,China;
4. Zhile Yingcai Education Center,Beijing 100022,China
2. College of Food Science & Technology,Shanghai Ocean University,Shanghai 201306,China;
3. College of Fisheries and Life Science,Shanghai Ocean University,Shanghai 201306,China;
4. Zhile Yingcai Education Center,Beijing 100022,China
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