Ocean acidification increases phytobenthic carbon fixation and export in a warm-temperate system

Wada, Shigeki; Agostini, Sylvain; Harvey, Ben P.; Omori, Yuko; Hall‐Spencer, Jason M.

doi:10.1016/j.ecss.2020.107113

Cited by 7 publications

(6 citation statements)

References 45 publications

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“…Under the elevated CO 2 concentration, however, the succession of phytoplankton from diatoms to dinoflagellates appeared to occur, but to much less extent, which was not enough for the latter to replace the former for the dominant group (Figures 5, 6). Higher relative abundance of diatoms under HC conditions was also observed in KOSMOS mesocosm experiment conducted in the Gulmar Fjord, Sweden (Bach et al, 2017), as well as at Shikine Island CO 2 seep, Japan (Harvey et al, 2019;Wada et al, 2021). These may attribute to competitive advantages of CCMs in diatoms, under HC conditions.…”

Section: Discussionsupporting

confidence: 58%

Elevated pCO2 Impedes Succession of Phytoplankton Community From Diatoms to Dinoflagellates Along With Increased Abundance of Viruses and Bacteria

et al. 2021

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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.

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Section: Discussionsupporting

confidence: 58%

Elevated pCO2 Impedes Succession of Phytoplankton Community From Diatoms to Dinoflagellates Along With Increased Abundance of Viruses and Bacteria

et al. 2021

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“…The CCM of Pt is essential to supply elevated CO 2 concentrations around RuBisCO (Hopkinson et al 2011 ; Hopkinson 2014 ). While there has been much focus on the response of diatom carbon fixation to ocean acidification (Wu et al 2014 ; Shi et al 2019 ; Wada et al 2021 ), less is known about how marine heatwaves and rising sea surface temperatures (SST) may impact the diatom CCM and ultimately the ability of diatoms to sequester carbon.…”

Section: Discussionmentioning

confidence: 99%

Temperature sensitivity of carbon concentrating mechanisms in the diatom Phaeodactylum tricornutum

Young

2023

Photosynth Res

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Marine diatoms are key primary producers across diverse habitats in the global ocean. Diatoms rely on a biophysical carbon concentrating mechanism (CCM) to supply high concentrations of CO2 around their carboxylating enzyme, RuBisCO. The necessity and energetic cost of the CCM are likely to be highly sensitive to temperature, as temperature impacts CO2 concentration, diffusivity, and the kinetics of CCM components. Here, we used membrane inlet mass spectrometry (MIMS) and modeling to capture temperature regulation of the CCM in the diatom Phaeodactylum tricornutum (Pt). We found that enhanced carbon fixation rates by Pt at elevated temperatures were accompanied by increased CCM activity capable of maintaining RuBisCO close to CO2 saturation but that the mechanism varied. At 10 and 18 °C, diffusion of CO2 into the cell, driven by Pt’s ‘chloroplast pump’ was the major inorganic carbon source. However, at 18 °C, upregulation of the chloroplast pump enhanced (while retaining the proportion of) both diffusive CO2 and active HCO3− uptake into the cytosol, and significantly increased chloroplast HCO3− concentrations. In contrast, at 25 °C, compared to 18 °C, the chloroplast pump had only a slight increase in activity. While diffusive uptake of CO2 into the cell remained constant, active HCO3− uptake across the cell membrane increased resulting in Pt depending equally on both CO2 and HCO3− as inorganic carbon sources. Despite changes in the CCM, the overall rate of active carbon transport remained double that of carbon fixation across all temperatures tested. The implication of the energetic cost of the Pt CCM in response to increasing temperatures was discussed.

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“…Here, we assess how the diversity, abundance, and function of macrobenthic fauna change from ambient to high CO2 areas. Our focus on invertebrates fills a gap, following-up on similar studies of Shikine Island CO2 gradients that focused on microbial biofilms (Kerfahi et al, 2020), algae (Harvey et al, 2021a, b;Wada et al, 2021), and fish (Cattano et al, 2020).…”

Section: Decreased Diversity and Abundance Of Marine Invertebrates At Co 2 Seeps In Warm-temperate Japanmentioning

confidence: 99%

“…Rough seas decimated the rocky reef communities at the acidified sites, removing most of the algal biomass, but the typhoons had much less effect at the sites with ambient pCO2 levels in seawater. The high typhoon resilience of marine communities growing at ambient pCO2 levels meant that they could store more carbon biomass and retain a higher diversity than marine communities growing at the acidified sites (Harvey et al, 2019(Harvey et al, , 2021aWada et al, 2021).…”

Section: Subtidal Findingsmentioning

confidence: 99%

Decreased Diversity and Abundance of Marine Invertebrates at CO2 Seeps in Warm-Temperate Japan

et al. 2022

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Ocean acidification increases phytobenthic carbon fixation and export in a warm-temperate system

Cited by 7 publications

References 45 publications

Elevated pCO2 Impedes Succession of Phytoplankton Community From Diatoms to Dinoflagellates Along With Increased Abundance of Viruses and Bacteria

Elevated pCO2 Impedes Succession of Phytoplankton Community From Diatoms to Dinoflagellates Along With Increased Abundance of Viruses and Bacteria

Temperature sensitivity of carbon concentrating mechanisms in the diatom Phaeodactylum tricornutum

Decreased Diversity and Abundance of Marine Invertebrates at CO2 Seeps in Warm-Temperate Japan

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