Articles | Volume 19, issue 20
https://doi.org/10.5194/bg-19-5007-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-19-5007-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
27 Oct 2022
Research article |
| 27 Oct 2022
| 27 Oct 2022
Variation in calcification of Reticulofenestra coccoliths over the Oligocene–Early Miocene
Department of Earth Science, ETH Zurich, 8092 Zurich, Switzerland
now at: Centro de Investigación Mariña, Universidade de Vigo,
GEOMA, Vigo, 36310, Spain
Miguel Ángel Fuertes
Departamento de Didáctica de las Matemáticas y de las Ciencias Experimentales, Universidad de Salamanca, Salamanca, 37008, Spain
José-Abel Flores
Department of Geology, University of Salamanca, Salamanca, 37008, Spain
Iván Hernández-Almeida
Department of Earth Science, ETH Zurich, 8092 Zurich, Switzerland
Department of Earth Science, ETH Zurich, 8092 Zurich, Switzerland
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Molly O. Patterson, Richard H. Levy, Denise K. Kulhanek, Tina van de Flierdt, Huw Horgan, Gavin B. Dunbar, Timothy R. Naish, Jeanine Ash, Alex Pyne, Darcy Mandeno, Paul Winberry, David M. Harwood, Fabio Florindo, Francisco J. Jimenez-Espejo, Andreas Läufer, Kyu-Cheul Yoo, Osamu Seki, Paolo Stocchi, Johann P. Klages, Jae Il Lee, Florence Colleoni, Yusuke Suganuma, Edward Gasson, Christian Ohneiser, José-Abel Flores, David Try, Rachel Kirkman, Daleen Koch, and the SWAIS 2C Science Team
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Nele Manon Vollmar, Karl-Heinz Baumann, Mariem Saavedra-Pellitero, and Iván Hernández-Almeida
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Ana Moreno, Miguel Iglesias, Cesar Azorin-Molina, Carlos Pérez-Mejías, Miguel Bartolomé, Carlos Sancho, Heather Stoll, Isabel Cacho, Jaime Frigola, Cinta Osácar, Arsenio Muñoz, Antonio Delgado-Huertas, Ileana Bladé, and Françoise Vimeux
Atmos. Chem. Phys., 21, 10159–10177, https://doi.org/10.5194/acp-21-10159-2021, https://doi.org/10.5194/acp-21-10159-2021, 2021
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We present a large and unique dataset of the rainfall isotopic composition at seven sites from northern Iberia to characterize their variability at daily and monthly timescales and to assess the role of climate and geographic factors in the modulation of δ18O values. We found that the origin, moisture uptake along the trajectory and type of precipitation play a key role. These results will help to improve the interpretation of δ18O paleorecords from lacustrine carbonates or speleothems.
Hongrui Zhang, Chuanlian Liu, Luz María Mejía, and Heather Stoll
Biogeosciences, 18, 1909–1916, https://doi.org/10.5194/bg-18-1909-2021, https://doi.org/10.5194/bg-18-1909-2021, 2021
Catarina Cavaleiro, Antje H. L. Voelker, Heather Stoll, Karl-Heinz Baumann, and Michal Kucera
Clim. Past, 16, 2017–2037, https://doi.org/10.5194/cp-16-2017-2020, https://doi.org/10.5194/cp-16-2017-2020, 2020
Cited articles
Alcantarilla, P. F., Bartoli, A., and Davison, A. KAZE Features, in: Computer Vision – ECCV 2012, edited by: Fitzgibbon, A., Lazebnik, S., Perona, P., Sato, Y., and Schmid, C., ECCV 2012, Lecture Notes in Computer Science, vol 7577, Springer, Berlin, Heidelberg, https://doi.org/10.1007/978-3-642-33783-3_16, 2012.
Bach, L. T., Riebesell, U., Gutowska, M. A., Federwisch, L., and Schulz, K.
G.: A unifying concept of coccolithophore sensitivity to changing carbonate
chemistry embedded in an ecological framework, Prog. Oceanogr.,
135, 125–138, 2015.
Barker, S., Higgins, J. A., and Elderfield, H.: The future of the carbon
cycle: review, calcification response, ballast and feedback on atmospheric
CO2, Philos. T. Roy. Soc. London A, 361, 1977–1999, 2003.
Beaufort, L.: Weight estimates of coccoliths using the optical properties
(birefringence) of calcite, Micropaleontology, 51, 289–297, 2005.
Beaufort, L., Probert, I., de Garidel-Thoron, T., Bendif, E. M., Ruiz-Pino,
D., Metzl, N., Goyet, C., Buchet, N., Coupel, P., and Grelaud, M.:
Sensitivity of coccolithophores to carbonate chemistry and ocean
acidification, Nature, 476, 80–83, 2011.
Beaufort, L., Gally, Y., Suchéras-Marx, B., Ferrand, P., and Duboisset, J.: Technical note: A universal method for measuring the thickness of microscopic calcite crystals, based on bidirectional circular polarization, Biogeosciences, 18, 775–785, https://doi.org/10.5194/bg-18-775-2021, 2021.
Bollmann, J.: Morphology and biogeography of Gephyrocapsa coccoliths in
Holocene sediments, Mar. Micropaleontol., 29, 319–350, 1997.
Bollmann, J.: Technical Note: Weight approximation of coccoliths using a circular polarizer and interference colour derived retardation estimates – (The CPR Method), Biogeosciences, 11, 1899–1910, https://doi.org/10.5194/bg-11-1899-2014, 2014.
Bolton, C. T., Hernandez-Sanchez, M. T., Fuertes, M. A., Gonzalez-Lemos, S.,
Abrevaya, L., Mendez-Vicente, A., Flores, J. A., Probert, I., Giosan, L.,
Johnson, J., and Stoll, H. M.: Decrease in coccolithophore calcification and
CO2 since the middle Miocene, Nat. Commun., 7, 10284, https://doi.org/10.1038/ncomms10284,
2016.
Cubillos, J. C., Henderiks, J., Beaufort, L., Howard, W. R., and
Hallegraeff, G. M.: Reconstructing calcification in ancient
coccolithophores: Individual coccolith weight and morphology of Coccolithus
pelagicus (sensu lato), Mar. Micropaleontol., 92, 29–39, 2012.
Dedert, M., Stoll, H., Kars, S., Young, J. R., Shimizu, N., Kroon, D.,
Lourens, L., and Ziveri, P.: Temporally variable diagenetic overgrowth on
deep-sea nannofossil carbonates across Palaeogene hyperthermals and
implications for isotopic analyses, Mar. Micropaleontol., 107, 18–31,
2014.
Flores, J. and Sierro, F.: Revised technique for calculation of calcareous
nannofossil accumulation rates, Micropaleontology, 43, 321–324, 1997.
Fuertes, M.-Á., Flores, J.-A., and Sierro, F. J.: The use of circularly
polarized light for biometry, identification and estimation of mass of
coccoliths, Mar. Micropaleontol., 113, 44–55, 2014.
Gibbs, S. J., Shackleton, N. J., and Young, J. R.: Identification of
dissolution patterns in nannofossil assemblages: A high-resolution
comparison of synchronous records from Ceara Rise, ODP Leg 154,
Paleoceanography, 19, PA1029, https://doi.org/10.1029/2003PA000958, 2004.
González-Lemos, S., Guitián, J., Fuertes, M.-Á., Flores, J.-A., and Stoll, H. M.: Technical note: An empirical method for absolute calibration of coccolith thickness, Biogeosciences, 15, 1079–1091, https://doi.org/10.5194/bg-15-1079-2018, 2018.
Guitián, J., Phelps, S., Polissar, P. J., Ausín, B., Eglinton, T.
I., and Stoll, H. M.: Midlatitude Temperature Variations in the Oligocene to
Early Miocene, Paleoceanogr. Paleoclimatol., 34, 1328–1343, 2019.
Guitián, J., Dunkley Jones, T., Hernández-Almeida, I., Löffel,
T., and Stoll, H. M.: Adaptations of coccolithophore size to selective
pressures during the Oligocene – Early Miocene high CO2 world,
Paleoceanogr. Paleoclimatol., 35, e2020PA003918,
https://doi.org/10.1029/2020PA003918, 2020.
Guitián, J., Ángel Fuertes, M., Flores, J.-A., Hernández-Almeida, I., and Stoll, H.: Variation in the degree of calcification of coccolithophores from IODP 1406, Zenodo [data set], https://doi.org/10.5281/zenodo.6341696, 2022.
Henderiks, J.: Coccolithophore size rules – reconstructing ancient cell
geometry and cellular calcite quota from fossil coccoliths, Mar.
Micropaleontol., 67, 143–154, 2008.
Henderiks, J. and Pagani, M.: Coccolithophore cell size and the Paleogene
decline in atmospheric CO2, Earth Planet. Sci. Lett., 269,
576–584, 2008.
Johnsen, S. L. and Bollmann, J.: Segmentation, retardation and mass
approximation of birefringent particles on a standard light microscope,
J, Microscopy, 280, 30–50, 2020.
McClelland, H., Bruggeman, J., Hermoso, M., and Rickaby, R.: The origin of
carbon isotope vital effects in coccolith calcite, Nat. Commun., 8,
1–16, 2017.
Monteiro, F. M., Bach, L. T., Brownlee, C., Bown, P., Rickaby, R. E.,
Poulton, A. J., Tyrrell, T., Beaufort, L., Dutkiewicz, S., and Gibbs, S.:
Why marine phytoplankton calcify, Sci. Adv., 2, e1501822, https://doi.org/10.1126/sciadv.1501822, 2016.
Norris, R., Wilson, P., and Blum, P.: Proceedings of the Integrated Ocean
Drilling Program Exp. 342, College Station, TX: Integrated Ocean Drilling
Program, https://doi.org/10.2204/iodp.proc.342.107.2014, 2014.
Paillard, D. and Donnadieu, Y.: A 100 Myr history of the carbon cycle based
on the 400 kyr cycle in marine δ13C benthic records,
Paleoceanography, 29, 1249–1255, 2014.
Rae, J. W., Zhang, Y. G., Liu, X., Foster, G. L., Stoll, H. M., and
Whiteford, R. D.: Atmospheric CO2 over the Past 66 Million Years from Marine
Archives, Annu. Rev. Earth Planet. Sci., 49, 599–631, https://doi.org/10.1146/annurev-earth-082420-063026, 2021.
Rost, B. and Riebesell, U.: Coccolithophores and the biological pump:
responses to environmental changes, in: Coccolithophores, Springer, 99–125,
2004.
Sibert, E. C. and Rubin, L. D.: An early Miocene extinction in pelagic
sharks, Science, 372, 1105–1107, 2021.
Siesser, W.: Calcareous nannoplankton, Fossil Prokaryotes and Protists, edited by: Bown, P. R., Blackwell Scientific Publications Oxford, 321 pp.,
169–202, 1993.
Young, J. R.: Neogene nannofossils, in: Calcareous Nannofossil Biostratigraphy, edited by: Bown, P. R.,
British Micropalaeontological Society Publications Series, Chapman and Hall, London, pp. 225–265 ISBN 9780412789700, 0412789701, 1998.
Young, J. R. and Ziveri, P.: Calculation of coccolith volume and it use in
calibration of carbonate flux estimates, Deep Sea Res. Pt. II, 47, 1679–1700, 2000.
Young, J. R., Didymus, J. M., Brown, P. R., Prins, B., and Mann, S.: Crystal
assembly and phylogenetic evolution in heterococcoliths, Nature, 356,
516–518, 1992.
Young, J. R., Henriksen, K., and Probert, I.: Structure and morphogenesis of the coccoliths of the CODENET species, in: Coccolithophores, edited by: Thierstein, H. R. and Young, J. R., Springer, Berlin, Heidelberg, https://doi.org/10.1007/978-3-662-06278-4_8, 2004.
Zhang, Y. G., Pagani, M., Liu, Z., Bohaty, S. M., and Deconto, R.: A
40-million-year history of atmospheric CO2, Philos. Trans. A Math. Phys. Eng.
Sci., 371, 20130096, https://doi.org/10.1098/rsta.2013.0096, 2013.
Short summary
The effect of environmental conditions on the degree of calcification of marine phytoplankton remains unclear. This study implements a new microscopic approach to quantify the calcification of ancient coccolithophores, using North Atlantic sediments. Results show significant differences in the thickness and shape factor of coccoliths for samples with minimum dissolution, providing the first evaluation of phytoplankton physiology adaptation to million-year-scale variable environmental conditions.
The effect of environmental conditions on the degree of calcification of marine phytoplankton...
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