Community structure and dynamics of phytoplankton in the western subarctic Pacific Ocean: A synthesis

被引:55
作者
Liu, HB
Suzuki, K
Saito, H
机构
[1] Louisiana Univ Marine Consortium, Chauvin, LA 70344 USA
[2] Hokkaido Univ, Grad Sch Environm Earth Sci, Kita Ku, Sapporo, Hokkaido 0600810, Japan
[3] Tohoku Natl Fisheries Res Inst, Fisheries Res Agcy, Shiogama 9850001, Japan
关键词
phytoplankton community structure; iron limitation; zooplankton grazing; HNLC; western subarctic Pacific; picophytoplankton;
D O I
10.1023/B:JOCE.0000038322.79644.36
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
The phytoplankton community in the western subarctic Pacific (WSP) is composed mostly of pico- and nanophytoplankton. Chlorophyll a (Chl a) in the <2 mum size fraction accounted for more than half of the total Chl a in all seasons, with higher contributions of up to 75% of the total Chl a in summer and fall. The exception is the western boundary along the Kamchatka Peninsula and Kuril Islands and the Oyashio region where diatoms make up the majority of total Chl a during the spring bloom. Among the picophytoplankton, picoeukaryotes and Synechococcus are approximately equally abundant, but the former is more important in term of carbon biomass. Despite the lack of a clear seasonal variation in Chl a concentration, primary productivity showed a large seasonal variation, and was lowest in winter and highest in spring. Seasonal succession in the phytoplankton community is also evident with the abundance of diatoms peaking in May, followed by picoeukaryotes and Synechococcus in summer. The growth of phytoplankton (especially >10 mum cell size) in the western subarctic Pacific is often limited by iron bioavailability, and microzooplankton grazing keeps the standing stock of pico- and nano-phytoplankton low. Compared to the other HNLC regions (the eastern equatorial Pacific, the Southern Ocean, and the eastern subarctic Pacific), iron limitation in the Western Subarctic Gyre (WSG) may be less severe probably due to higher iron concentrations. The Oyashio region has similar physical condition, macronutrient supply and phytoplankton species compositions to the WSG, but much higher phytoplankton biomass and primary productivity. The difference between the Oyashio region and the WSG is also believed to be the results of difference in iron bioavailability in both regions.
引用
收藏
页码:119 / 137
页数:19
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