Influence of diatom diversity on the ocean biological carbon pump

Tréguer, Paul; Bowler, Chris; Moriceau, Brivaëla; Dutkiewicz, Stephanie; Gehlen, Marion; Aumont, Olivier; Bittner, Lucie; Dugdale, Richard C.; Finkel, Zoe V.; Iudicone, Daniele; Jahn, O.; Guidi, Lionel; Lasbleiz, M.; Leblanc, Karine; Lévy, Marina; Pondaven, Philippe

doi:10.1038/s41561-017-0028-x

Cited by 510 publications

(440 citation statements)

References 123 publications

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“…Predicting the role of diatoms in primary production in a warming ocean is important to understand potential effects for higher trophic levels (e.g., fisheries). The ideas presented here are consistent with model simulations suggesting that diatom contribution to primary production will decline everywhere outside of the Southern Ocean in the future (Tréguer et al, ). However, these authors also suggest a strong role for diatom species to shift in response to climate.…”

Section: Resultssupporting

confidence: 89%

Understanding Diatoms’ Past and Future Biogeochemical Role in High‐Latitude Seas

Krause

Lomas

2020

Geophysical Research Letters

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Because cold‐water diatoms’ baseline elemental density (BED) is substantially higher than temperate diatoms, previous polar studies may have underestimated diatoms’ contribution to elemental standing stocks, contribution to particulate organic carbon (POC) export and incorrectly modeled their susceptibility to future warming. We apply cold‐water diatom allometry to Arctic field samples and derive diatom growth rates ranging from 0.01–0.68 day−1, versus unrealistically high rates estimated using temperate diatom allometry. Reanalysis of published Southern Ocean data (Antarctic Environment and Southern Ocean Process Study and European Iron Fertilization Experiment) shows that diatom POC was significantly underestimated and diatoms could have accounted for a majority of POC export. However, during some field programs (Kerguelen Plateau), temperate allometry properly accounted for diatom biomass. We also predict that warming sea surface temperature may alter high‐latitude diatom BED, suggesting that even if abundances do not change with warming, the reduced diatom BED will likely lower the trophic‐transfer efficiency and their total carbon flow to consumers.

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Section: Resultssupporting

confidence: 89%

Understanding Diatoms’ Past and Future Biogeochemical Role in High‐Latitude Seas

Krause

Lomas

2020

Geophysical Research Letters

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“…Thus, it is critical to understand how the dominant species respond to both increasing CO 2 and decreasing pH to better predict how OA will affect the phytoplankton community and the primary production in the future ocean (Tréguer et al. ).…”

Section: Discussionmentioning

confidence: 99%

The physiological response of marine diatoms to ocean acidification: differential roles of seawater pCO₂ and pH

Shi

Hong

Shen

et al. 2019

Journal of Phycology

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Although increasing the pCO2 for diatoms will presumably down‐regulate the CO2‐concentrating mechanism (CCM) to save energy for growth, different species have been reported to respond differently to ocean acidification (OA). To better understand their growth responses to OA, we acclimated the diatoms Thalassiosira pseudonana, Phaeodactylum tricornutum, and Chaetoceros muelleri to ambient (pCO2 400 μatm, pH 8.1), carbonated (pCO2 800 μatm, pH 8.1), acidified (pCO2 400 μatm, pH 7.8), and OA (pCO2 800 μatm, pH 7.8) conditions and investigated how seawater pCO2 and pH affect their CCMs, photosynthesis, and respiration both individually and jointly. In all three diatoms, carbonation down‐regulated the CCMs, while acidification increased both the photosynthetic carbon fixation rate and the fraction of CO2 as the inorganic carbon source. The positive OA effect on photosynthetic carbon fixation was more pronounced in C. muelleri, which had a relatively lower photosynthetic affinity for CO2, than in either T. pseudonana or P. tricornutum. In response to OA, T. pseudonana increased respiration for active disposal of H+ to maintain its intracellular pH, whereas P. tricornutum and C. muelleri retained their respiration rate but lowered the intracellular pH to maintain the cross‐membrane electrochemical gradient for H+ efflux. As the net result of changes in photosynthesis and respiration, growth enhancement to OA of the three diatoms followed the order of C. muelleri > P. tricornutum > T. pseudonana. This study demonstrates that elucidating the separate and joint impacts of increased pCO2 and decreased pH aids the mechanistic understanding of OA effects on diatoms in the future, acidified oceans.

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“…The intensification of the upwelling regime favors the nutrient content in the euphotic zone, drives denitrification, and consumes nitrate in subsurface waters through degradation of organic carbon (Arellano‐Torres et al, ; Ganeshram, ; Ganeshram et al, ). However, NO 3 − decline does not limit diatoms as much as silicate, because diatoms are more competitive to store nutrients in vacuoles or storage organelles, among other adaptations (Mock & Medlin, ; Tréguer et al, ; Uitz et al, ). During the mid‐Holocene, additional inputs of essential micronutrients (iron) could fertilize the ocean during rainfall pulses and water runoff from land, favoring turbulence and making diatoms more competitive and abundant than other groups.…”

Section: Discussionmentioning

confidence: 99%

A 14‐ka Record of Dust Input and Phytoplankton Regime Changes in the Subtropical NE Pacific: Oceanic and Terrestrial Processes Linked by Teleconnections at Suborbital Scales

Arellano‐Torres

Álvarez-Covelli

Kasper‐Zubillaga³

et al. 2019

Paleoceanog and Paleoclimatol

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We study shifts in phytoplankton proxies linked to terrigenous inputs and teleconnections in a core from Soledad Basin, Gulf of Ulloa, NW Mexico, spanning the end of the deglaciation and the Holocene. We used biogenic opal (% opal), organic carbon (% total organic carbon [TOC]), and inorganic carbon (% CaCO3) as proxies of productivity and opal/TOC and CaCO3/TOC ratios as proxies of nutrient uptake and C‐export by siliceous and carbonate organisms. We reconstructed terrestrial inputs and identified authigenic gypsum. Based on opal/TOC and CaCO3/TOC ratios, we found periodic changes of ~0.5, 1.1–1.8 ka cycle in phytoplankton proxies exporting siliceous and carbonate skeletal debris to the sediments. An increase in carbonate organisms occurred during 14–8.7 ka, corresponding to reduced El Niño–Southern Oscillation (ENSO)‐like variability, in parallel to the northward displacement of the Intertropical Convergence Zone (ITCZ) and an overall negative phase of the Pacific Decadal Oscillation (PDO). An increase in siliceous organisms occurred between 6 and 3 ka, coincident with strong ENSO‐like conditions, southern migration of ITCZ, and less intense but more frequent positive PDO‐hydrological variability. Grain size analyses show significant amounts of fine fraction (dust <6.6 μm) present during the early‐ to mid‐Holocene in agreement to extreme weather on land, with episodes of eolian and fluvial transport to the sea. The ENSO‐like variations influenced biological C‐export producers on a scale of 1.1–1.8 ka, but PDO‐related variability is uncertain. We suggest that Holocene drivers for phytoplankton successions are changes in insolation, ITCZ migration, California Current upwelling, nutrient inputs by advection, and terrestrial sources.

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Influence of diatom diversity on the ocean biological carbon pump

Abstract: International audienc

Cited by 510 publications

References 123 publications

Understanding Diatoms’ Past and Future Biogeochemical Role in High‐Latitude Seas

Understanding Diatoms’ Past and Future Biogeochemical Role in High‐Latitude Seas

The physiological response of marine diatoms to ocean acidification: differential roles of seawater pCO₂ and pH

A 14‐ka Record of Dust Input and Phytoplankton Regime Changes in the Subtropical NE Pacific: Oceanic and Terrestrial Processes Linked by Teleconnections at Suborbital Scales

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Influence of diatom diversity on the ocean biological carbon pump

Abstract: International audienc

Cited by 510 publications

References 123 publications

Understanding Diatoms’ Past and Future Biogeochemical Role in High‐Latitude Seas

Understanding Diatoms’ Past and Future Biogeochemical Role in High‐Latitude Seas

The physiological response of marine diatoms to ocean acidification: differential roles of seawater pCO2 and pH

A 14‐ka Record of Dust Input and Phytoplankton Regime Changes in the Subtropical NE Pacific: Oceanic and Terrestrial Processes Linked by Teleconnections at Suborbital Scales

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The physiological response of marine diatoms to ocean acidification: differential roles of seawater pCO₂ and pH