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CHEN Yunyan, SUN Xiaoxia, ZHUN Mingliang. Net-phytoplankton communities in the Western Boundary Currents and their environmental correlations[J]. HaiyangYuHuZhao, 2018, 36(2): 305-316

Net-phytoplankton communities in the Western Boundary Currents and their environmental correlations

CHEN Yunyan1,2, SUN Xiaoxia1,2,3, ZHUN Mingliang1
1 Jiao Zhou Bay Marine Ecosystem Research Station, Chinese Academy of Sciences, Qingdao 266071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
This study investigated net-phytoplankton biomass, species composition, the phytoplankton abundance horizontal distribution, and the correlations between net-phytoplankton communities and mesoscale structure that were derived from the net samples taken from the Western Boundary Currents during summer, 2014. A total of 199 phytoplankton species belonging to 61 genera in four phyla were identified. The dominant species included Climacodium frauenfeldianum, Thalassiothrix longissima, Rhizosolenia styliformis var. styliformis, Pyrocystis noctiluca, Ceratium trichoceros, and Trichodesmium thiebautii. Four phytoplankton communities were divided by cluster analysis and the clusters were mainly associated with the North Equatorial Counter Current (NECC), the North Equatorial Current (NEC), the Subtropical Counter Current (STCC), and the Luzon Current (LC), respectively. The lowest phytoplankton cell abundance and the highest Trichodesmium filament abundance were recorded in the STCC region. The principal component analysis showed that T. thiebautii preferred warm and nutrient poor water. There was also an increase in phytoplankton abundance and biomass near 5°N in the NECC region, where they benefit from upwellings and eddies.
Key words:    net-phytoplankton communities|Western Boundary Currents|upwelling|eddies|fronts   
Received: 2016-09-29   Revised:
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