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Coccolith mass and morphology of different Emiliania huxleyi morphotypes: A critical examination using Canary Islands material

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  • Simen Alexander Linge Johnsen
  • Jörg Bollmann

Abstract

Different morphotypes of the abundant marine calcifying algal species Emiliania huxleyi are commonly linked to various degrees of E. huxleyi calcification, but few studies have been done to validate this assumption. This study investigated therefore whether E. huxleyi morphotypes can be related to coccolithophore calcification and coccolith mass. Samples from January (high productivity) and September (low productivity) 1997 at an open ocean and a coastal site near the Canary Islands were analysed using a combination of thickness measurements (Circular Polarizer Retardation estimates (CPR) method), Scanning Electron Microscope imaging, and Markov Chain Monte Carlo (MCMC) models. Mean E. huxleyi coccolith mass varied from a maximum of 2.9pg at the open ocean station in January to a minimum of 1.7pg in September at both stations. In contrast, overall calcite produced by E. huxleyi (assuming 23 coccoliths/cell) varied from a maximum of 2.6 μgL-1 at the coastal station in January to a minimum of 0.5 μgL-1 in September at the open ocean site. The relative abundance of “Overcalcified” Type A, Type A, Group B and malformed coccoliths was determined from SEM images. The mean coccolith mass of “Overcalcified” Type A was 2.0pg using the CPR-method, while mean mass of Type A and Group B coccoliths was determined using coccolith length measurements from SEM images and MCMC models relating thickness measurements to morphotype relative abundance. Type A cocccolith mass varied from a 1.6pg to 2.6pg and Group B coccolith mass varied from 1.5pg to 2.0pg. These results demonstrate that the coccolith mass of Type A, “Overcalcified” Type A, and Group B do not differ systematically and there is no systematic relationship between relative abundance of a morphotype and the overall calcite production of E. huxleyi. Therefore, morphotype appearance and relative abundance can not be uniformly used as reliable indicators of E. huxleyi calcification or calcite production.

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  • Simen Alexander Linge Johnsen & Jörg Bollmann, 2020. "Coccolith mass and morphology of different Emiliania huxleyi morphotypes: A critical examination using Canary Islands material," PLOS ONE, Public Library of Science, vol. 15(3), pages 1-29, March.
    • Handle: RePEc:plo:pone00:0230569
    DOI: 10.1371/journal.pone.0230569
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    1. Simen Alexander Linge Johnsen & Jörg Bollmann & Christina Gebuehr & Jens O Herrle, 2019. "Relationship between coccolith length and thickness in the coccolithophore species Emiliania huxleyi and Gephyrocapsa oceanica," PLOS ONE, Public Library of Science, vol. 14(8), pages 1-23, August.
    2. L. Beaufort & I. Probert & T. de Garidel-Thoron & E. M. Bendif & D. Ruiz-Pino & N. Metzl & C. Goyet & N. Buchet & P. Coupel & M. Grelaud & B. Rost & R. E. M. Rickaby & C. de Vargas, 2011. "Sensitivity of coccolithophores to carbonate chemistry and ocean acidification," Nature, Nature, vol. 476(7358), pages 80-83, August.
    3. Matthew Stephens, 2000. "Dealing with label switching in mixture models," Journal of the Royal Statistical Society Series B, Royal Statistical Society, vol. 62(4), pages 795-809.
    4. Ulf Riebesell & Ingrid Zondervan & Björn Rost & Philippe D. Tortell & Richard E. Zeebe & François M. M. Morel, 2000. "Reduced calcification of marine plankton in response to increased atmospheric CO2," Nature, Nature, vol. 407(6802), pages 364-367, September.
    5. Ken Caldeira & Michael E. Wickett, 2003. "Anthropogenic carbon and ocean pH," Nature, Nature, vol. 425(6956), pages 365-365, September.
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