Study on dynamics of net-phytoplankton in Bohai Bay ecological monitoring area in summer from 2004 to 2015

Huang Haiyan; Yang Yi; Yang Lu; Zuo Guocheng; Zeng Rong

doi:10.3969/j.issn.0253-4193.2018.01.013

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Huang Haiyan, Yang Yi, Yang Lu, Zuo Guocheng, Zeng Rong. Study on dynamics of net-phytoplankton in Bohai Bay ecological monitoring area in summer from 2004 to 2015[J]. Haiyang Xuebao, 2018, 40(1): 115-128. doi: 10.3969/j.issn.0253-4193.2018.01.013

Citation:

Huang Haiyan, Yang Yi, Yang Lu, Zuo Guocheng, Zeng Rong. Study on dynamics of net-phytoplankton in Bohai Bay ecological monitoring area in summer from 2004 to 2015[J]. Haiyang Xuebao, 2018, 40(1): 115-128. doi: 10.3969/j.issn.0253-4193.2018.01.013

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Study on dynamics of net-phytoplankton in Bohai Bay ecological monitoring area in summer from 2004 to 2015

doi: 10.3969/j.issn.0253-4193.2018.01.013

National Marine Data and Information Service, Tianjin 300171, China

Received Date: 2017-03-29

Abstract

Abstract

Based on the net-phytoplankton data collected from Bohai Bay ecological monitoring area in the summer of 2004-2015, interannual variability in phytoplankton community and 96 species were studied. Results showed, a total of 5 phyla including 120 species of phytoplankton were identified in recent 12 years, in which diatoms and dinoflagellates are the most dominant groups and 59% are red-tide species. The species numbers of all the years varied from 23 to 61, and annual cell abundances from 7×10⁴ cells/m³ to 87 731×10⁴ cells/m³. The biodiversity indexes ranged from 1.13 to 3.04, richness indexes 0.36-1.12 and evenness indexes 0.31-0.72. During 12 years, the species numbers and cell abundances have displayed an increasing trend, while the biodiversity and richness increased with fluctuation, the evenness index showed a slight trend of declination. Around 10 species were identified every year, and 23 species were only observed once. For the occurrence rate, only 4 species occurred in more than 50% stations, and 57 species less than 0.01% stations. Coscinodiscus asteromphalus, Skeletonema costatum, Coscinodiscus granii, Ceratium furca and Chaetoceros curvisetus were dominant species. The cell abundances in recent 5 years were much higher than those before 2010. Specifically, 10 common species showed a blooming trend such as Coscinodiscus granii, Skeletonema costatum and Noctiluca scintillans. While sub-common species such as Nitzschia longissima, Coscinodiscus asteromphalus and Chaetoceros borealis decreased gradually. This study would be of great significance to understand current phytoplankton status and variation trends.
- Bohai Bay ecological monitoring area,
- net-phytoplankton,
- species dynamics,
- community dynamics

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