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  • 1
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    PANGAEA
    In:  Supplement to: Gerecht, Andrea; Šupraha, Luka; Langer, Gerald; Henderiks, Jorijntje (2018): Phosphorus limitation and heat stress decrease calcification in Emiliania huxleyi. Biogeosciences, 15(3), 833-845, https://doi.org/10.5194/bg-15-833-2018
    Publication Date: 2024-05-27
    Description: Calcifying haptophytes (coccolithophores) sequester carbon in the form of organic and inorganic cellular components (coccoliths). We examined the effect of phosphorus (P) limitation and heat stress on particulate organic and inorganic carbon (calcite) production in the coccolithophore Emiliania huxleyi. Both environmental stressors are related to rising CO2 levels and affect carbon production in marine microalgae, which in turn impacts biogeochemical cycling. Using semi-continuous cultures, we show that P limitation and heat stress decrease the calcification rate in E. huxleyi. However, using batch cultures, we show that different culturing approaches (batch versus semi-continuous) induce different physiologies. This affects the ratio of particulate inorganic (PIC) to organic carbon (POC) and complicates general predictions on the effect of P limitation on the PIC/POC ratio. We found heat stress to increase P requirements in E. huxleyi, possibly leading to lower standing stocks in a warmer ocean, especially if this is linked to lower nutrient input. In summary, the predicted rise in global temperature and resulting decrease in nutrient availability may decrease CO2 sequestration by E. huxleyi through lower overall carbon production. Additionally, the export of carbon may be diminished by a decrease in calcification and a weaker coccolith ballasting effect.
    Keywords: Abundance per volume; Alkalinity, total; Carbon, organic, particulate, per cell; Carbon, total, particulate, per cell; Cell, diameter; Cell, diameter, standard deviation; Coccoliths; Coccoliths, incomplete; Coccoliths, malformed; Coccoliths per coccosphere; Coccoliths per coccosphere, standard deviation; Equivalent spherical diameter; Experiment; Growth rate; Number of cells; Oslo_Fjord; pH; Phosphate; Phosphorus, organic, particulate, per cell; Replicate; Species; Treatment: nutrients; Treatment: temperature
    Type: Dataset
    Format: text/tab-separated-values, 2012 data points
    Location Call Number Limitation Availability
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  • 2
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    European Journal of Phycology
    In:  EPIC37th European Phycological Congress, Zagreb, Croatia, 2019-08-25-2019-08-30European Journal of Phycology
    Publication Date: 2019-09-04
    Description: The comprehensive description of unicellular heterotrophic protists is essential for understanding the functioning of marine ecosystems and defining evolutionary relationships within marine microbial communities. For that reason, new insights into the functional genes of key protists, such as ciliates and dinoflagellates, are needed to complement the increasing taxonomic complexity and bridge the gap between various eco-functional processes in the ocean. In this study, single-cell transcriptomic sequencing proved to be an efficient method to create a snapshot of expressed genes of unicellular heterotrophs. We sequenced 65 single-cell transcriptomes from 20 fresh field samples collected from Sub-Arctic and North Sea waters. These 13 ciliate and 52 dinoflagellate transcriptomes will generally contribute to a greater understanding of functional and evolutionary processes of these marine protists. Further, we generated multi-gene phylogenies of several dozen genes to unravel the relationships of these heterotrophic taxa to other dinoflagellates and ciliates, respectively. These approaches also helped to elucidate the evolution of functional genes and traits for these understudied essential groups. Additionally, the datasets were incorporated into our metatranscriptomic reference database to fill the gap (of approx. 50%) of genomic information of heterotrophic organisms and their functional processes. Overall, identifying the phylogenetic relationships and functional diversity of heterotrophic and mixotrophic protists will clarify paramount marine microbial food web processes and provide clues to the system's sensitivity to climate change.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
    Location Call Number Limitation Availability
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