Effects of multiple drivers of ocean global change on the physiology and functional gene expression of the coccolithophore Emiliania huxleyi

Global Change Biology, Journal Year: 2020, Volume and Issue: 26(10), P. 5630 - 5645

Published: June 29, 2020

Abstract Ongoing ocean global change due to anthropogenic activities is causing multiple chemical and physical seawater properties simultaneously, which may affect the physiology of marine phytoplankton. The coccolithophore Emiliania huxleyi a model species often employed in study carbon cycle. effect acidification (OA) on calcification has been extensively studied; however, physiological responses environmental drivers are still largely unknown. Here we examined two‐way driver effects OA other key drivers—nitrate, phosphate, irradiance, temperature—on growth, photosynthetic, rates, elemental composition E. . In addition, changes functional gene expression were understand molecular mechanisms underpinning responses. single manipulation experiments suggest decreased nitrate supply being most important regulating physiology, by significantly reducing rates. interaction (projected for year 2100) had more negative synergistic than all factorial manipulations, suggesting linkage between dominant (nitrate) interactive with drivers. Simultaneous five conditions projected 2100 largest metrics. Furthermore, genes associated inorganic acquisition ( RubisCO , AEL1 δCA ) CAX3 PATP NhaA2 downregulated manipulation, revealing linkages These findings together indicate that holistic projections future change, it necessary relative importance both individually (i.e., mechanistic understanding) interactively cumulative effect) physiology.

Language: Английский

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Rapid Reduction of pH and CaCO₃ Saturation State in the Tsugaru Strait by the Intensified Tsugaru Warm Current During 2012–2019

Geophysical Research Letters, Journal Year: 2021, Volume and Issue: 48(10)

Published: May 4, 2021

Abstract To examine the ocean acidification of coastal water as result oceanic uptake anthropogenic atmospheric CO 2 , we initiated monitoring in eastern part Tsugaru Strait, through which Warm Current flows eastward from Sea Japan to North Pacific. Annual mean pH and CaCO 3 saturation state during 2012–2019 decreased considerably throughout all depths at rates 0.0030–0.0051 0.017–0.036 years −1 respectively. These decrease are faster than those caused by increasing observed previous research. fast attributed an enhanced increase dissolved inorganic carbon concurrently with increases salinity density elevated mixing upper deeper waters western strait. The is attributable strengthening Current.

Language: Английский

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Photosynthetic CO2 uptake by Ulva (Chlorophyta) as a potential contribution to global warming containment

Journal of Applied Phycology, Journal Year: 2023, Volume and Issue: 35(5), P. 1987 - 1994

Published: March 1, 2023

Language: Английский

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Effects of pH, Temperature, and Light on the Inorganic Carbon Uptake Strategies in Early Life Stages of Macrocystis pyrifera (Ochrophyta, Laminariales)

Plants, Journal Year: 2024, Volume and Issue: 13(23), P. 3267 - 3267

Published: Nov. 21, 2024

The responses of seaweed species to increased CO

Language: Английский

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Epiphytes provide micro-scale refuge from ocean acidification

Marine Environmental Research, Journal Year: 2020, Volume and Issue: 161, P. 105093 - 105093

Published: July 29, 2020

Language: Английский

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A reduction in metabolism explains the tradeoffs associated with the long‐term adaptation of phytoplankton to high CO₂ concentrations

New Phytologist, Journal Year: 2021, Volume and Issue: 233(5), P. 2155 - 2167

Published: Dec. 15, 2021

Phytoplankton are responsible for nearly half of global primary productivity and play crucial roles in the Earth's biogeochemical cycles. However, long-term adaptive responses phytoplankton to rising CO2 remains unknown. Here we examine physiological proteomics a marine diatom, Phaeodactylum tricornutum, following (c. 900 generations) selection high conditions. Our results show that this diatom responds by downregulating proteins involved energy production (Calvin cycle, tricarboxylic acid glycolysis, oxidative pentose phosphate pathway), with subsequent decrease photosynthesis respiration. Nearly similar extents downregulation respiration allow -adapted populations allocate same fraction carbon growth, thereby maintaining their fitness during selection. These indicate an important role metabolism reduction under shed new light on mechanisms response climate change.

Language: Английский

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Using macroalgae to address UN Sustainable Development goals through CO₂ remediation and improvement of the aquaculture environment

Applied Phycology, Journal Year: 2022, Volume and Issue: 3(1), P. 360 - 367

Published: March 4, 2022

Among efforts to explore ways achieve carbon neutrality globally or regionally, photosynthetic sequestration by algae has been identified as having immense potential. Algae play a crucial role in providing the base of aquatic ecosystems, driving important biogeochemical cycles oceans and freshwaters and, so doing, act critical component for CO2 drawdown from atmosphere ameliorating global change. Furthermore, are used extensively some societies source food have potential feedstock biofuels sources bioactive chemicals. Such activities align strongly with number United Nations Sustainable Development Goals (SDGs). Here we discuss how marine macroalgae might contribute several these goals exploring their enhance aquaculture, "Blue Carbon" ameliorate climate change (UN SDGs 13,14) provide biomass SDG 7) reduce reliance on fossil fuel combustion. Though further work is required, suggest that farming air great mitigation emissions improvement aquaculture environments.Summary: Photosynthetic activity macroalgae, addition biosynthesis accumulation, can cause arise pH due depletion/HCO3–. This buffer decrease associated anthropogenic increases effects ocean acidification. increasing magnitude, macroalgal still represents only asmall fraction Cdrawdown wild populations currently accounts an even lower emissions. Nonetheless, scaling up intensive could be one approach more Modification IMTA involving growth rather than seawater prove auseful means help stabilize fluctuations oxygen operations.

Language: Английский

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Anticipating the Future of the World's Ocean

Annual Review of Environment and Resources, Journal Year: 2022, Volume and Issue: 47(1), P. 291 - 315

Published: March 19, 2022

Oceans play critical roles in the lives, economies, cultures, and nutrition of people globally, yet face increasing pressures from human activities that put those benefits at risk. To anticipate future world's ocean, we review many impose on marine species ecosystems, evaluating their impacts life, degree scientific uncertainty assessments, expected trajectory over next few decades. We highlight fundamental research should prioritize areas high potential impact greater about ecosystem vulnerability, such as emerging fisheries, organic chemical pollution, seabed mining, interactions cumulative pressures, deprioritize demonstrate little or are well understood, plastic pollution ship strikes to fauna. There remains hope for a productive sustainable but window opportunity action is closing.

Language: Английский

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Ocean warming and CO2-driven acidification can alter the toxicity of metal-contaminated sediments to the meiofauna community

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 885, P. 163687 - 163687

Published: May 1, 2023

Language: Английский

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Predicting the impacts of climate change on New Zealand’s seaweed-based ecosystems

New Zealand Journal of Botany, Journal Year: 2023, Volume and Issue: unknown, P. 1 - 27

Published: Sept. 5, 2023

The impacts of global climate change are threatening the health and integrity New Zealand's seaweed ecosystems that provide crucial ecological, economic, cultural benefits. Important species comprise these include canopy forming large brown algae (fucoids kelp), understorey species. Here we review current knowledge measured stressors on Zealand seaweeds. Ocean warming has driven increasing frequencies, durations, intensities marine heatwaves globally in Zealand. Significant negative resulting from have already been observed (giant kelp Macrocystis pyrifera bull Durvillaea spp.). We predict ongoing ocean associated will alter distributional range basic physiology many species, with poleward shifts for Increased extreme weather events causes accelerated erosion sediments into environment re-suspension sediments, termed coastal darkening, which reduced growth rates available vertical space rocky reefs is predicted to worsen future. Furthermore, acidification reduce recruitment coralline algae, this may settlement success invertebrate larvae. Mechanistic underpinnings effects multiple drivers occurring combination poorly described. Finally, local stressors, such as overfishing, likely interact ecosystems. Thus, very different futures depending whether they managed appropriately or not. Given recent increases sea surface temperatures frequency some regions Zealand, predicting seaweeds important communities support becoming increasingly conserving resilient

Language: Английский

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