Seawater carbonate chemistry and viruses,bacteria Abundance and phytoplankton community structure

• Main Authors: Huang, Ruiping, Sun, J, Yang, Yunlan, Jiang, Xiaowen, Wang, Zhen, Song, Xue, Wang, Tifeng, Zhang, Di, Li, He, Yi, Xiangqi, Chen, Shouchang, Bao, Nanou, Qu, Liming, Zhang, Rui, Jiao, Nianzhi, Gao, Yahui, Huang, Bangqin, Lin, Xin, Gao, Guang, Gao, Kunshan
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Ammonium; Aragonite saturation state; Bacteria; Bicarbonate ion; Biogenic silica; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Chlorophyll a; Coast and continental shelf; Community composition and diversity; Day of experiment; Entire community; EXP; Experiment; Field experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Mesocosm or benthocosm; Night period respiration; Nitrate; Nitrite; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phosphate; Primary production; carbon assimilation; Primary production/Photosynthesis; Replicates; Respiration; Salinity; Silicate; Temperate; Temperature; water; Treatment; Type; Virus; Wuyuan_Bay_OA; Pacific; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.940012; https://doi.org/10.1594/PANGAEA.940012

Eutrophic coastal regions are highly productive and greatly influenced by human activities. Primary production supporting the coastal ecosystems is supposed to be affected by progressive ocean acidification driven by increasing CO2 emissions. In order to investigate the effects of high pCO2 (HC) on eutrophic plankton community structure and ecological functions, we employed 9 mesocosms and carried out an experiment under ambient (410 ppmv) and future high (1000 ppmv) atmospheric pCO2 conditions, using in situ plankton community in Wuyuan Bay, East China Sea. Our results showed that HC along with natural seawater temperature rise significantly boosted biomass of diatoms with decreased abundance of dinoflagellates in the late stage of the experiment, demonstrating that HC repressed the succession from diatoms to dinoflagellates, a phenomenon observed during algal blooms in the East China Sea. HC did not significantly influence the primary production or biogenic silica contents of the phytoplankton assemblages. However, the HC treatments increased the abundance of viruses and heterotrophic bacteria, reflecting a refueling of nutrients for phytoplankton growth from virus-mediated cell lysis and bacterial degradation of organic matters. Conclusively, our results suggest that increasing CO2 concentrations can modulate plankton structure including the succession of phytoplankton community and the abundance of viruses and bacteria in eutrophic coastal waters, which may lead to altered biogeochemical cycles of carbon and nutrients.