Interactive effects of temperature and nitrogen source on the elemental stoichiometry of a polar diatom

Schiffrine, N.; Tremblay, Jean‐Éric; Babin, Marcel

doi:10.1002/lno.12235

Cited by 3 publications

(2 citation statements)

References 58 publications

(97 reference statements)

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“…Consistently, a study on polar diatoms found that temperatures above 6 °C tend to be supra-optimal for them [ 82 ]. Similar results were found for an Arctic Chaetoceros strain [ 83 ]. However, the intra-specific variation approaching the thermal limits of diatoms appears to be high [ 82 , 84 ], and therefore polar species might adapt to warming in the longer term.…”

Section: Discussionsupporting

confidence: 87%

Winners and Losers of Atlantification: The Degree of Ocean Warming Affects the Structure of Arctic Microbial Communities

Ahme

Jackowski

Wolf

et al. 2023

Genes

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Arctic microbial communities (i.e., protists and bacteria) are increasingly subjected to an intrusion of new species via Atlantification and an uncertain degree of ocean warming. As species differ in adaptive traits, these oceanic conditions may lead to compositional changes with functional implications for the ecosystem. In June 2021, we incubated water from the western Fram Strait at three temperatures (2 °C, 6 °C, and 9 °C), mimicking the current and potential future properties of the Arctic Ocean. Our results show that increasing the temperature to 6 °C only minorly affects the community, while an increase to 9 °C significantly lowers the diversity and shifts the composition. A higher relative abundance of large hetero- and mixotrophic protists was observed at 2 °C and 6 °C compared to a higher abundance of intermediate-sized temperate diatoms at 9 °C. The compositional differences at 9 °C led to a higher chlorophyll a:POC ratio, but the C:N ratio remained similar. Our results contradict the common assumption that smaller organisms and heterotrophs are favored under warming and strongly indicate a thermal limit between 6 °C and 9 °C for many Arctic species. Consequently, the magnitude of temperature increase is a crucial factor for microbial community reorganization and the ensuing ecological consequences in the future Arctic Ocean.

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Section: Discussionsupporting

confidence: 87%

Winners and Losers of Atlantification: The Degree of Ocean Warming Affects the Structure of Arctic Microbial Communities

Ahme

Jackowski

Wolf

et al. 2023

Genes

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“…The Rubisco percentages of total protein we measured in Jones Sound could be driven lower by higher contributions of heterotrophic microbial biomass compared to the intense phytoplankton bloom conditions examined in the Southern Ocean by Young et al (2015 a , b ). Similarly, recent studies of a specific Arctic Chaetoceros species, Chaetoceros gelidus , show evidence of the widespread diatom species exhibiting growth rates more similar to temperate phytoplankton species (Schiffrine et al 2022). It is also important to note that all previous data used to calculate % Rubisco were generated using western blots rather than quantitative mass spectrometry.…”

Section: Discussionmentioning

confidence: 79%

Rubisco in high Arctic tidewater glacier‐marine systems: A new window into phytoplankton dynamics

Roberts,

Bhatia,

Rowland

et al. 2024

Limnology & Oceanography

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The hundreds of tidewater glaciers found in the Canadian Arctic Archipelago have the potential to enhance delivery of nutrients and other material to the surface ocean. Despite this, their influence on marine ecosystems, specifically phytoplankton, is poorly characterized. Here we developed and applied a quantitative mass spectrometry‐based approach to measure phytoplankton ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) concentrations to examine differences in productivity in glacierized and non‐glacierized marine systems in Jones Sound, Nunavut, within Inuit Nunangat. Comparisons to chloroplast 16S rRNA gene amplicon sequencing data suggested that these measurements detect the majority of Rubisco produced in Jones Sound. Because Rubisco catalyzes carbon fixation, we used these measurements to estimate total and group‐specific primary production potential, which were within the range of historical primary production measurements made using classical methods in this region. Our measurements also revealed that up to 2% of total protein in the water column is Rubisco, and that Rubisco concentrations are correlated with chlorophyll fluorescence, with maxima near the nitracline. Rubisco produced by diatom genera Chaetoceros and Thalassiosira were higher in marine regions influenced by glaciers, while Rubisco from Micromonas (Chlorophyta) was greater in non‐glacierized regions. This suggests that future climate scenarios may favor smaller phytoplankton groups, like Micromonas, with consequences for food webs and carbon cycling. This study broadens our understanding of how tidewater glaciers will impact phytoplankton communities, now and in a warmer future, and lays the foundation for using this mass spectrometry‐based approach to quantify phytoplankton group‐specific carbon fixation potential in other marine regions.

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Acclimation-driven microalgal cultivation improved temperature and light stress tolerance, CO2 sequestration and metabolite regulation for bioenergy production

Chauhan

Sahoo

Mohanty

2023

Bioresource Technology

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Interactive effects of temperature and nitrogen source on the elemental stoichiometry of a polar diatom

Abstract: Author Contribution Statement: N.S. designed the experiments, grew the cultures and conducted the analyses. N.S. and J.-E.T. wrote the manuscript with feedback from M.B.

Cited by 3 publications

References 58 publications

Winners and Losers of Atlantification: The Degree of Ocean Warming Affects the Structure of Arctic Microbial Communities

Winners and Losers of Atlantification: The Degree of Ocean Warming Affects the Structure of Arctic Microbial Communities

Rubisco in high Arctic tidewater glacier‐marine systems: A new window into phytoplankton dynamics

Acclimation-driven microalgal cultivation improved temperature and light stress tolerance, CO2 sequestration and metabolite regulation for bioenergy production

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