Coupling and Decoupling of High Biomass Phytoplankton Production and Hypoxia in a Highly Dynamic Coastal System: The Changjiang (Yangtze River) Estuary

Zhou, Feng; Chai, Fei; Huang, Daji; Wells, Mark L.; Ma, Xiao; Meng, Qicheng; Xue, Huijie; Xuan, Jiliang; Wang, Pengbin; Ni, Xiaobo; Zhao, Quanhua; Liu, Chenggang; Su, Jilan; Li, Hongliang

doi:10.3389/fmars.2020.00259

Cited by 46 publications

(40 citation statements)

References 102 publications

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“…The biogeochemical module was based on the carbon, silicate, and nitrogen ecosystem (CoSiNE) model (Chai et al, 2002;Xiu & Chai, 2014). The coupled ROMS-CoSiNE model customized for the Bohai Sea, Yellow Sea and East China Sea with a homogeneous 1/24° horizontal resolution (hereafter BYESbio24) has been applied to the study of hypoxia in the ECS (F. Zhou et al, 2017Zhou et al, , 2020.…”

Section: Pelagic Modelmentioning

confidence: 99%

Water Oxygen Consumption Rather Than Sediment Oxygen Consumption Drives the Variation of Hypoxia on the East China Sea Shelf

et al. 2022

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Section: Pelagic Modelmentioning

confidence: 99%

Water Oxygen Consumption Rather Than Sediment Oxygen Consumption Drives the Variation of Hypoxia on the East China Sea Shelf

et al. 2022

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“…[19] and Chlamydomonas reinhardtii [20], while other studies showed that the lowered pO 2 insignificantly affected the growth of C. reinhardtii [21] and even decreased the growth of diatom S. costatum [6], indicating the effects of lowering pO 2 are still unclear. Other studies also referred to the survival of diatoms in anoxic conditions through using nitrate as an electron acceptor [22], as well as the contribution or function of the bloomed phytoplankton to the formation of hypoxic zones [23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Diatoms are important in marine ecosystems considering they account for ~20% of marine primary production [36] and sequester more carbon to the ocean's interior with a fast sinking rate [14]. Diatoms are believed to dominate in global oceans, especially in estuarine or coastal waters where the lowered O 2 /hypoxia often occurs [2,4,16,23]. The genus Thalassiosira that appears in fresh-water, brackish, coastal, and oceanic environments are particular representatives [37].…”

Section: Introductionmentioning

confidence: 99%

Lowering pO2 Interacts with Photoperiod to Alter Physiological Performance of the Coastal Diatom Thalassiosira pseudonana

Chen

Liu

et al. 2021

Microorganisms

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Exacerbating deoxygenation is extensively affecting marine organisms, with no exception for phytoplankton. To probe these effects, we comparably explored the growth, cell compositions, photosynthesis, and transcriptome of a diatom Thalassiosira pseudonana under a matrix of pO2 levels and Light:Dark cycles at an optimal growth light. The growth rate (μ) of T. pseudonana under a 8:16 L:D cycle was enhanced by 34% by low pO2 but reduced by 22% by hypoxia. Under a 16:8 L:D cycle, however, the μ decreased with decreasing pO2 level. The cellular Chl a content decreased with decreasing pO2 under a 8:16 L:D cycle, whereas the protein content decreased under a 16:8 L:D cycle. The prolonged photoperiod reduced the Chl a but enhanced the protein contents. The lowered pO2 reduced the maximal PSII photochemical quantum yield (FV/FM), photosynthetic oxygen evolution rate (Pn), and respiration rate (Rd) under the 8:16 or 16:8 L:D cycles. Cellular malondialdehyde (MDA) content and superoxide dismutase (SOD) activity were higher under low pO2 than ambient pO2 or hypoxia. Moreover, the prolonged photoperiod reduced the FV/FM and Pn among all three pO2 levels but enhanced the Rd, MDA, and SOD activity. Transcriptome data showed that most of 26 differentially expressed genes (DEGs) that mainly relate to photosynthesis, respiration, and metabolism were down-regulated by hypoxia, with varying expression degrees between the 8:16 and 16:8 L:D cycles. In addition, our results demonstrated that the positive or negative effect of lowering pO2 upon the growth of diatoms depends on the pO2 level and is mediated by the photoperiod.

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“…This value is within the Δ 14 C range of YES2-3 bottom (22.3‰ ± 2.8‰). YES2-3 surface contained more than 10% of the CR water (Figure 7a) during our sampling, but the contribution from the CR end-member may vary in different time and primary producers might be drifted from other locations (Zhou et al, 2020). Thus, we consider an extreme case that all the sinking particles recorded the riverine signal of YE-1 (−173.6‰), and were decomposed near YES2-3 bottom.…”

Section: Biological Processes Producing Additional Dic Components To the Subsurface Water In Coastal Hypoxic Zonementioning

confidence: 99%

Hypoxic Effects on the Radiocarbon in DIC of the ECS Subsurface Water

et al. 2021

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The East China Sea (ECS) features the largest continental shelf in the northwest Pacific Ocean, receiving 924 km 3 freshwater annually from the Changjiang (Yangtze) River (CR), which accounts for 90% of the total freshwater input to the ECS (Dai et al., 2011;Qu et al., 2005). Thus, the Changjiang dilute water (salinity less than 31 psu) exerts a great effect on the physical and chemical structure of the ECS shelf (Chen

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Coupling and Decoupling of High Biomass Phytoplankton Production and Hypoxia in a Highly Dynamic Coastal System: The Changjiang (Yangtze River) Estuary

Cited by 46 publications

References 102 publications

Water Oxygen Consumption Rather Than Sediment Oxygen Consumption Drives the Variation of Hypoxia on the East China Sea Shelf

Water Oxygen Consumption Rather Than Sediment Oxygen Consumption Drives the Variation of Hypoxia on the East China Sea Shelf

Lowering pO2 Interacts with Photoperiod to Alter Physiological Performance of the Coastal Diatom Thalassiosira pseudonana

Hypoxic Effects on the Radiocarbon in DIC of the ECS Subsurface Water

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