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the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 21 May 2019

Research article | 21 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).

Calcification and distribution of extant coccolithophores across the Drake Passage during late austral summer 2016

Mariem Saavedra-Pellitero1,2, Karl-Heinz Baumann1, Miguel Ángel Fuertes3, Hartmut Schulz4, Yann Marcon1,5, Nele Manon Vollmar1, José-Abel Flores3, and Frank Lamy6 Mariem Saavedra-Pellitero et al.
  • 1Department of Geosciences, University of Bremen, P.O. Box 33 04 40, 28334 Bremen, Germany
  • 2School of Geography, Earth and Environmental Sciences, University of Birmingham, UK
  • 3Departamento de Geología, Universidad de Salamanca, 37008 Salamanca, Spain
  • 4Mathematisch-Naturwissenschaftliche Fakultät, University of Tubingen, Hölderlinstr. 12, 72074 Tübingen, Germany
  • 5MARUM, Center for Marine Environmental Sciences, University of Bremen, 28359 Bremen, Germany
  • 6Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, D-27568, Bremerhaven, Germany

Abstract. Coccolithophores are globally distributed microscopic marine algae that exert a major influence on the global carbon cycle through calcification and primary productivity. There is recent interest in coccolithophore polar communities, however field observations regarding their biogeographic distribution are scarce for the Southern Ocean. This study documents the latitudinal variability in the coccolithophore assemblage composition and the coccolith mass variation of the ecologically dominant Emiliania huxleyi across the Drake Passage. Ninety-six water samples were taken between 10 and 150 m water depth from 18 stations during POLARSTERN Expedition PS97 (February–April, 2016). A minimum of 200 coccospheres per sample were classified in scanning electron microscope and coccolith mass was estimated with light microscopy, using the C-Calcita software. We find that coccolithophore abundance and diversity decrease southwards marking different oceanographic fronts as ecological boundaries. We characterize three zones: (1) the Chilean margin, where E. huxleyi type A (normal and overcalcified) and type R are present; (2) the Subantarctic Zone (SAZ), where E. huxleyi reaches maximum values of 212.5×103cells/L and types B/C, C, O are dominant. (3) The Polar Front Zone (PFZ), where E. huxleyi types B/C and C dominate. We link the decreasing trend in E. huxleyi coccolith mass to the poleward latitudinal succesion from type A to type B group. Remarkably, we find that coccolith mass is strongly anticorrelated to total alkalinity, total CO2, bicarbonate ion and pH. We speculate that low temperatures are a greater limiting factor than carbonate chemistry in the Southern Ocean. However, further in situ oceanographical data is needed to verify the proposed relationships. We hypothesize that assemblage composition and calcification modes of E. huxleyi in the Drake Passage will be strongly influenced by the ongoing climate change.

Mariem Saavedra-Pellitero et al.
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Mariem Saavedra-Pellitero et al.
Mariem Saavedra-Pellitero et al.
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