Volume 43 Issue 10
Oct.  2024
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Yibo Wang, Zhiliang Liu, Yanping Qi, Xiao Chen, Yang Chen, Du Su, Xiaobo Yuan, James Klippel-Cooper. Response of phytoplankton communities to environmental changes in the Bohai Sea in late summer (2011−2020)[J]. Acta Oceanologica Sinica, 2024, 43(10): 107-120. doi: 10.1007/s13131-024-2305-z
Citation: Yibo Wang, Zhiliang Liu, Yanping Qi, Xiao Chen, Yang Chen, Du Su, Xiaobo Yuan, James Klippel-Cooper. Response of phytoplankton communities to environmental changes in the Bohai Sea in late summer (2011−2020)[J]. Acta Oceanologica Sinica, 2024, 43(10): 107-120. doi: 10.1007/s13131-024-2305-z

Response of phytoplankton communities to environmental changes in the Bohai Sea in late summer (2011−2020)

doi: 10.1007/s13131-024-2305-z
Funds:  The National Natural Science Foundation of China under contract No. 42206161; the Natural Science Foundation of Hebei Province under contract No. D2022407004; the Science Research Project of Hebei Education Department under contract No. QN2022167; the Open Fund Project of Hebei Key Laboratory of Ocean Dynamics, Resources and Environments under contract No. HBHY04.
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  • Corresponding author: E-mail: zhlliu3897@hevttc.edu.cn
  • Received Date: 2023-11-15
  • Accepted Date: 2024-03-27
  • Available Online: 2024-12-17
  • Publish Date: 2024-10-25
  • Understanding the dynamics of phytoplankton communities in coastal zones is crucial for the management and conservation of coastal ecosystems. Previous research indicated that the phytoplankton community structure and dominant taxa in the Bohai Sea (BHS) have exhibited significant shifts from the 1990s to the early 2010s in response to environmental changes, especially the change in nutrient structure. This study comprehensively investigated the variations in net-collected phytoplankton (>76 μm) community structure, diversity, and environmental factors in the BHS during the late summers of 2011−2020, aiming to understand the recent trend in phytoplankton community structure and to explore the interactions between the communities and the environment. During the study period, the nutrient status in the BHS was characterized by a decrease in dissolved inorganic nitrogen (DIN) concentration, an increase in dissolved inorganic phosphorus (DIP) concentration, and a return of the nitrogen-to-phosphorus (N/P) molar ratio (hereinafter referred to as N/P ratio) to the Redfield ratio since 2016. The eutrophication index (EI) in the BHS remained stable and was generally at a low level (<1). The Dia/Dino index fluctuated but did not show an obvious trend. Overall, the eutrophication, the imbalance in nutrient ratio, and the shift in phytoplankton community structure did not continue during the study period. The increased abundance of phytoplankton was strongly associated with elevated concentrations of DIN, as well as higher N/P and nitrogen-to-silicon (N/Si) ratios, whereas the greater diversity was strongly linked to higher concentrations of DIP. Diatoms and dinoflagellates showed significant differences in their interactions with the environment, and their relative dominance was related to water column depth and stratification intensity; their impacts on the phytoplankton community diversity were also significantly different. The variations of certain dominant species, i.e., Skeletonema costatum, Paralia sulcata, and Tripos longipes, exhibited strong links to the changes in nutrient structure in the BHS. The findings of this study contribute to understanding the regional environmental changes and provide insights into the adaptive strategies of coastal ecosystems in response to environmental shifts and fluctuations.
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