Articles | Volume 18, issue 20
https://doi.org/10.5194/bg-18-5789-2021
© Author(s) 2021. 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-18-5789-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Oct 2021
Research article |
| 28 Oct 2021
| 28 Oct 2021
Population dynamics and reproduction strategies of planktonic foraminifera in the open ocean
MARUM Center for Marine Environmental Sciences, University of Bremen,
Leobener Straße 8, 28359 Bremen, Germany
Michael Siccha
MARUM Center for Marine Environmental Sciences, University of Bremen,
Leobener Straße 8, 28359 Bremen, Germany
Maike Kaffenberger
MARUM Center for Marine Environmental Sciences, University of Bremen,
Leobener Straße 8, 28359 Bremen, Germany
Jelle Bijma
Alfred Wegener Institute Helmholtz Centre for Polar and Marine
Research, Bremerhaven, Germany
Michal Kucera
MARUM Center for Marine Environmental Sciences, University of Bremen,
Leobener Straße 8, 28359 Bremen, Germany
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Cultured at in situ high-pressure conditions Cibicides and Cibicidoides taxa develop lasting ectoplasmic structures that cannot be retracted or resorbed. An ectoplasmic envelope surrounds their test and may protect the shell, e.g. versus carbonate aggressive bottom water conditions. Ectoplasmic roots likely anchor the specimens in areas of strong bottom water currents, trees enable them to elevate themselves above ground, and twigs stabilize and guide the retractable pseudopodial network.
Markus Raitzsch, Jelle Bijma, Torsten Bickert, Michael Schulz, Ann Holbourn, and Michal Kučera
Clim. Past, 17, 703–719, https://doi.org/10.5194/cp-17-703-2021, https://doi.org/10.5194/cp-17-703-2021, 2021
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At approximately 14 Ma, the East Antarctic Ice Sheet expanded to almost its current extent, but the role of CO2 in this major climate transition is not entirely known. We show that atmospheric CO2 might have varied on 400 kyr cycles linked to the eccentricity of the Earth’s orbit. The resulting change in weathering and ocean carbon cycle affected atmospheric CO2 in a way that CO2 rose after Antarctica glaciated, helping to stabilize the climate system on its way to the “ice-house” world.
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Short summary
Planktonic foraminifera population dynamics has long been assumed to be controlled by synchronous reproduction and ontogenetic vertical migration (OVM). Due to contradictory observations, this concept became controversial. We here test it in the Atlantic ocean for four species of foraminifera representing the main clades. Our observations support the existence of synchronised reproduction and OVM but show that more than half of the population does not follow the canonical trajectory.
Planktonic foraminifera population dynamics has long been assumed to be controlled by...
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