Preliminary discussion on the phytoplankton assemblages and its response to the environmental changes in the Changjiang (Yangtze) River Estuary and its adjacent waters during the dry season and the wet season

Li Zhao; Song Shuqun; Li Caiwen; Yu Zhiming

doi:10.3969/j.issn.0253-4193.2017.10.011

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Li Zhao, Song Shuqun, Li Caiwen, Yu Zhiming. Preliminary discussion on the phytoplankton assemblages and its response to the environmental changes in the Changjiang (Yangtze) River Estuary and its adjacent waters during the dry season and the wet season[J]. Haiyang Xuebao, 2017, 39(10): 124-144. doi: 10.3969/j.issn.0253-4193.2017.10.011

Citation:

Li Zhao, Song Shuqun, Li Caiwen, Yu Zhiming. Preliminary discussion on the phytoplankton assemblages and its response to the environmental changes in the Changjiang (Yangtze) River Estuary and its adjacent waters during the dry season and the wet season[J]. Haiyang Xuebao, 2017, 39(10): 124-144. doi: 10.3969/j.issn.0253-4193.2017.10.011

Citation:

Li Zhao, Song Shuqun, Li Caiwen, Yu Zhiming. Preliminary discussion on the phytoplankton assemblages and its response to the environmental changes in the Changjiang (Yangtze) River Estuary and its adjacent waters during the dry season and the wet season[J]. Haiyang Xuebao, 2017, 39(10): 124-144. doi: 10.3969/j.issn.0253-4193.2017.10.011

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Preliminary discussion on the phytoplankton assemblages and its response to the environmental changes in the Changjiang (Yangtze) River Estuary and its adjacent waters during the dry season and the wet season

doi: 10.3969/j.issn.0253-4193.2017.10.011

1.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266200, China

Received Date: 2016-12-23
Rev Recd Date: 2017-03-13

Abstract

Abstract

Based on the multi-discipline surveys in the Changjiang (Yangtze) River Estuary and its adjacent waters in March and August 2013, the phytoplankton species composition and community structure was studied, and its correlations with major environment factors were analyzed as well. During the dry season, 80 taxa belonging to 41 genera and 3 phyla were identified. Paralia sulcate was the most dominant specie. The cell abundance ranged from 0.15×10³ cells/L to 16.35×10³ cells/L, with an average of (3.24±3.14)×10³ cells/L. The horizontal distribution of cell abundance was mainly dominated by diatom, with high values appeared in the north of the survey area and lower in the coastal waters. During the wet season, 135 taxa belonging to 67 genera and 4 phyla were identified, the main dominant species were Prorocentrum donghaiense and Skeletonema sp.. The cell abundance ranging from 0.2×10³ cells/L to 1 925.45×10³ cells/L, with an average of (41.67±186.00)×10³ cells/L, was higher in the north of the survey area as well as in the southeast area close to the coast, dominated by dinoflagellate. The salinity and turbidity influenced the phytoplankton assemblage during the survey. The N/P ratio, instead of Si/N ratio, played a significant role in regulating the phytoplankton community structure. With the increase of N/P ratio, the diatom became dominant in the phytoplankton assemblage. Proliferation of phytoplankton in the upper layer and stratification of water column were necessary for the formation of hypoxia. Diatom-dominant community had higher sinking rate than dinoflagelate-dominant community, thus in favor of the consuming of dissolved oxygen in the bottom waters.
- phytoplankton,
- assemblage structure,
- Changjiang (Yangtze) River Estuary,
- diluted water,
- hypoxia

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References(32)

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