Comparing pulse amplitude modulated (PAM) fluorometry with radiocarbon technique for determination of inorganic carbon fixation in <i>Chlorella vulgaris</i> (Trebouxiophyceae, Chlorophyta)

Camargo, Eduardo Caffagni; Rossi, Raquel Andrade; Silva, Jaqueline Carmo; Miwa, Adriana Cristina Poli; Prášil, Ondřej; Calijuri, Maria do Carmo; Lombardi, Ana Teresa

doi:10.1080/09670262.2021.1885065

Cited by 2 publications

(1 citation statement)

References 72 publications

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“…The upregulation of photosynthetic activity in this study was accompanied by higher algal biomass, which clearly indicates a photobiological and growth response to the higher sea ice light availability (Schreiber, 2004). Although we did not measure C fixation directly in this study, e.g., as 14 C fixation (Stemann-Nielsen, 1952) photosynthetic activity as determined by PAM methods correlates broadly with C fixation rates in microalgae, including ice algae, in many studies (Glud et al, 2002;Hancke et al, 2015;Lund-Hansen et al, 2017), although this is species-specific, preferably involving conversion of rETR to absolute rates of electron transport (Hancke et al, 2015); see also Camargo et al (2022) for other complications. Nevertheless, the observed increase in rETR max strongly indicates corresponding increase in primary production, given the broad correspondence of 14 C-based carbon uptake and rETR max (Barranguet and Kromkamp, 2000).…”

Section: Photobiology and Productivity Of The Dinoflagellate Bloommentioning

confidence: 99%

An Arctic sea ice spring bloom driven and dominated by Dinoflagellates - a harbinger of the future sea ice?

Lund-Hansen,

Kobberup,

Jensen

et al. 2024

Front. Mar. Sci.

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The sea ice spring bloom is crucial for sustaining Arctic marine food webs, with sea ice algae serving as primary carbon sources for higher trophic levels. Despite the prevailing dominance of diatom species in sea ice spring blooms, our study highlights a notable deviation, showcasing a bloom driven by dinoflagellates. Through field sampling of first-year sea ice cores and subsequent analysis of physical and biogeochemical parameters, combined with amplicon sequencing of the 18S rRNA gene, we investigated the occurrence and implications of this significant dinoflagellate bloom, with a particular focus on Polarella glacialis. Our findings reveal that high irradiances at the top of the ice core, coupled with elevated nutrient availability and warm ice conditions, are key drivers of this phenomenon, as elucidated by redundancy analysis. Moreover, our results suggest a potential climate-driven decline in snow cover on sea ice, increased open leads, and thinner sea ice, which may favor the proliferation of dinoflagellates over diatoms. This alternative dinoflagellate-dominated bloom could have profound ecological consequences, given the enriched omega-3 fatty acid content of dinoflagellates, thereby influencing energy transfer within the Arctic marine food web. Furthermore, our study identifies the presence of not only Polarella glacialis but also Chytridinium, an ectoparasite on copepod eggs, and the green algae Ulothrix in relatively high abundances within the sea ice. These findings shed light on the intricate interplay between environmental factors and microbial community dynamics within Arctic sea ice ecosystems.

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Section: Photobiology and Productivity Of The Dinoflagellate Bloommentioning

confidence: 99%

An Arctic sea ice spring bloom driven and dominated by Dinoflagellates - a harbinger of the future sea ice?

Lund-Hansen,

Kobberup,

Jensen

et al. 2024

Front. Mar. Sci.

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Chlorophyll fluorometry in evaluating photosynthetic performance: key limitations, possibilities, perspectives and alternatives

Лысенко

Rajput

Singh

et al. 2022

Physiol Mol Biol Plants

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Comparing pulse amplitude modulated (PAM) fluorometry with radiocarbon technique for determination of inorganic carbon fixation in Chlorella vulgaris (Trebouxiophyceae, Chlorophyta)

Cited by 2 publications

References 72 publications

An Arctic sea ice spring bloom driven and dominated by Dinoflagellates - a harbinger of the future sea ice?

An Arctic sea ice spring bloom driven and dominated by Dinoflagellates - a harbinger of the future sea ice?

Chlorophyll fluorometry in evaluating photosynthetic performance: key limitations, possibilities, perspectives and alternatives

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