Transcriptomic reprogramming of the oceanic diatom Skeletonema dohrnii under warming ocean and acidification

Environmental Microbiology, Journal Year: 2020, Volume and Issue: 23(2), P. 980 - 995

Published: Sept. 25, 2020

Under ocean warming and acidification, diatoms use a unique acclimation adaptation strategy by saving energy utilizing it for other cellular processes. However, the molecular mechanisms that underlie this reprogramming of utilization are currently unknown. Here, we investigate metabolic ecologically important diatom Skeletonema dohrnii grown under two different temperature (21°C 25°C) pCO2 (400 1000 ppm) levels, global transcriptomic analysis. We find evolutionary changes in baseline gene expression, which termed transcriptional up- downregulation, is primary mechanism used to acclimate combined conditions acidification. This regulation shows higher conditions, photosynthesis, electron transport carboxylation were modified with increasing abundances genes encoding ATP, NADPH carbon gaining carbon-dioxide-concentrating (CCMs). Our results also indicate CCMs led decrease cost save promoting amino acid synthesis nitrogen assimilation active protein processing machinery adapt study generated insights into suggests future climate change will cause oceanic facilitate their strategy.

Language: Английский

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Insights from sodium into the impacts of elevated pCO2 and temperature on bivalve shell formation

Journal of Experimental Marine Biology and Ecology, Journal Year: 2016, Volume and Issue: 486, P. 148 - 154

Published: Oct. 15, 2016

Language: Английский

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Contrasting impacts of ocean acidification and warming on the molecular responses of CO2-resilient oysters

BMC Genomics, Journal Year: 2017, Volume and Issue: 18(1)

Published: June 2, 2017

This study characterises the molecular processes altered by both elevated CO2 and increasing temperature in oysters. Differences resilience of marine organisms against environmental stressors associated with climate change will have significant implications for sustainability coastal ecosystems worldwide. Some evidence suggests that can differ between populations within a species. B2 oysters represent unique genetic resource because their capacity to better withstand impacts at physiological level, compared non-selected from same species (Saccostrea glomerata). Here, we used proteomic transcriptomic analysis gill tissue evaluate whether differential response also extends increased temperature. Substantial distinctive effects on protein concentrations gene expression were evident among responding or The combination oyster proteomes expression. However, not additive synergistic, may be antagonistic. data suggest simultaneous exposure CO2-resilient near-future projected ocean pH results complex changes order prevent stress-induced cellular damage. combined indicates addition thermal stress impair these decreased pH. Overall, this reveals intracellular mechanisms might enable calcifiers endure emergent, adverse seawater conditions resulting change.

Language: Английский

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Ocean Acidification Mitigates the Negative Effects of Increased Sea Temperatures on the Biomineralization and Crystalline Ultrastructure of Mytilus

Frontiers in Marine Science, Journal Year: 2020, Volume and Issue: 7

Published: Oct. 8, 2020

Negative impacts of global climate change are predicted for a range taxa. Projections predict marked increases in sea surface temperatures and ocean acidification (OA), arguably placing calcifying organisms at most risk. While detrimental environmental on the growth ultrastructure bivalve mollusc shells have been shown, rapid diel fluctuations pH typical coastal systems often not considered. Mytilus edulis, an economically important marine calcifier vulnerable to change, were exposed current future (380 ppm 1000 pCO2), warming (17°C; 20°C), (OAW) scenarios seawater system incorporating natural pH. Both macroscopic morphometrics (length, width, height, volume) microscopic changes crystalline structure (ultrastructure) using electron backscatter diffraction (EBSD) measured over time. Increases temperature OAW led increased decreased shell respectively marginal cavity volumes. Shell crystal matrices became disordered shifting toward preferred alignment under elevated indicating restricted growth, whereas grown maintained single fabrics suggesting OA may ameliorate some negative consequences increases. However, both significant size (grain area diameter) misorientation frequencies, propensity brittleness. Results suggest adult become more susceptible biological determinants survival future, altering ecosystem functioning.

Language: Английский

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Plasticity in organic composition maintains biomechanical performance in shells of juvenile scallops exposed to altered temperature and pH conditions

Scientific Reports, Journal Year: 2021, Volume and Issue: 11(1)

Published: Dec. 17, 2021

Abstract The exposure to environmental variations in pH and temperature has proven impacts on benthic ectotherms calcifiers, as evidenced by tradeoffs between physiological processes. However, how these stressors affect structure functionality of mollusk shells received less attention. Episodic events upwelling deep cold low waters are well documented eastern boundary systems may be stressful mollusks, impairing both biomechanical performance. These projected become more intense, extensive time with ongoing global warming. In this study, we evaluate the independent interactive effects biomineral properties Argopecten purpuratus scallop shells. Total organic matter shell mineral increased under reduced (~ 7.7) control conditions (pH ~ 8.0). periostracum layer coating outer surface showed protein content but decreasing sulfate polysaccharides content. Reduced negatively density increases disorder orientation calcite crystals. At elevated temperatures (18 °C), microhardness increased. Other were not affected pH/temperature treatments. Thus, a reduction 0.3 units temperature, response A. was tradeoff among compounds (biopolymer plasticity), density, crystal organization (mineral plasticity) maintain performance, while ameliorated hardness. Biopolymer plasticity associated ecophysiological indicating that, influence natural fluctuations energetic constraints might critical modulating long-term sustainability compensatory mechanism.

Language: Английский

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The Mediterranean mussel Mytilus galloprovincialis: responses to climate change scenarios as a function of the original habitat

Conservation Physiology, Journal Year: 2020, Volume and Issue: 9(1)

Published: Nov. 20, 2020

Abstract The impact of simulated seawater acidification and warming conditions on specimens the mussel Mytilus galloprovincialis locally adapted to very distinct, widely separated sites in Mediterranean Sea (Tunisia) Atlantic (Galicia, NW Spain) was evaluated relation key behavioural eco-physiological parameters. Over 2-month exposure experimental conditions, mussels were fed optimally ensure that there are no synergistic interactions between climate change drivers energetic status individuals. In general, regardless origin (Atlantic or Mediterranean), rather resilient for most parameters considered they able grow strongly acidified through an increased feeding activity. However, shell strength decreased (40%) consistently both populations held moderately highly seawater. observed reduction not explained by slight alterations organic matter, thickness aragonite:calcite ratio. combined effects high response byssus caused a strong decline performance, although only Galician mussels, which valve opening time sharply as well condition index (soft tissue state) growth. By contrast, negative effect scenario Tunisian shells (partly but totally) counterbalanced higher temperature. Eco-physiological complex, future scenarios ecology species also feasibility cultivating them zones discussed.

Language: Английский

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Susceptibility of two co-existing mytilid species to simulated predation under projected climate change conditions

Hydrobiologia, Journal Year: 2017, Volume and Issue: 807(1), P. 247 - 261

Published: Oct. 13, 2017

Language: Английский

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Compressive strength of Mytilus californianus shell is time-dependent and can influence the potential foraging strategies of predators

Marine Biology, Journal Year: 2018, Volume and Issue: 165(3)

Published: Feb. 5, 2018

Language: Английский

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Differential responses in anti-predation traits of the native oyster Ostrea edulis and invasive Magallana gigas to ocean acidification and warming

Marine Ecology Progress Series, Journal Year: 2021, Volume and Issue: 665, P. 87 - 102

Published: March 15, 2021

Ocean acidification and warming (OAW) pose a threat to marine organisms, with particular negative effects on molluscs, can jeopardize the provision of associated ecosystem services. As predation is an important factor shaping populations in environment, ability organisms retain traits valuable resistance under OAW may be decisive for future population maintenance. We examine how exposure seawater temperature (control: 16.8°C warm: 20°C) atmospheric p CO 2 (ambient [~400], ~750, ~1000 ppm) conditions affects linked (adductor muscle strength shell strength) two ecologically economically species oysters ( Magallana gigas Ostrea edulis ) relate them changes morphometry fitness (condition index, metrics). show that O. remained unimpacted following scenarios. In contrast, adductor M. was 52% stronger elevated ~750 ppm , its 44% weaker combined 2. This suggests greater mechanical toward mid-21 st century, but susceptibility end century. For both species, individuals more somatic tissue held ecological advantage against predators; consequently, smaller favoured by predators OAW. By affecting resistance, expected induce shifts predator-prey interactions reshape assemblage structure due size selection, which consequently modify oyster reef functioning. could turn have implications

Language: Английский

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Global Crystallographic Texture of Freshwater Bivalve Mollusks of the Unionidae Family from Eastern Europe Studied by Neutron Diffraction

Life, Journal Year: 2022, Volume and Issue: 12(5), P. 730 - 730

Published: May 13, 2022

The crystallographic texture of the whole valves bivalve mollusks from family Unionidae Unio pictorum Linnaeus, 1758 and Anodonta cygnea is studied using pole figures measured neutron diffraction. use diffraction, in contrast to X-rays, makes it possible study without destroying them. Thus, we can discuss global entire valve. It was revealed that aragonite repeat their shape. density maxima for U. Danube Delta Gulf Finland Baltic Sea, living at different salinities temperatures, differs by 0.41 mrd. maximum value A. also (5.07 mrd). In terms sharpness, surpasses shell marine mollusks, which are partially or completely composed aragonite. Although Mya arenaria have microstructures, very similar isolines pattern, but differ maxima. No relationship found between microstructure pictorum. addition, report good qualitative agreement X-ray Sinanodonta woodiana Lea, 1834 Czech river Luznice, Delta.

Language: Английский

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