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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2019-511
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-511
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 20 Jan 2020

Submitted as: research article | 20 Jan 2020

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This preprint is currently under review for the journal BG.

Foraminiferal holobiont thermal tolerance under climate change – Roommates problems or successful collaboration?

Doron Pinko, Sigal Abramovich, and Danna Titelboim Doron Pinko et al.
  • The Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beer Sheva, 8410501, Israel

Abstract. Understanding the response of marine organisms to expected future warming is essential. Large Benthic Foraminifera (LBF) are symbiont bearing protists considered to be major carbonate producers and ecosystems engineers. We examined the thermal tolerance of two main types of LBF holobionts characterized by different algal symbionts and shell types (resulted from alternative biomineralization mechanisms): The hyaline diatom bearing, Amphistegina lobifera, and the porcelaneous dinoflagellate bearing, Sorites orbiculus. To assess the relative contribution of host and symbiont algae to the holobiont thermal tolerance we separately evaluated their response by measuring calcification rates and photosynthetic activity under present-day and future warming scenarios. Our results show that both holobionts exhibit thermal resilience up to 32 °C and sensitivity to 35 °C. This sensitivity differs in the magnitude of their response: calcification of A. lobifera was completely inhibited while it was only reduced in S. orbiculus. Thus, future warming will significantly shift the relative contribution of the two species as carbonate producers. Moreover, A. lobifera exhibited a synchronized response of the host and symbionts. In contrast, in S. orbiculus the symbionts responded prior to the host, possibly limiting its resilience. Our results also demonstrate the role of pre-exposure and acclimation processes of host, symbionts or both in mitigating future warming. It highlights the possibility that while pre-exposure to moderate temperatures benefits the holobiont, in cases of extreme temperature it might reduce its thermal tolerance.

Doron Pinko et al.

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Status: open (until 02 Mar 2020)
Status: open (until 02 Mar 2020)
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Doron Pinko et al.

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Short summary
Future warming threatens many marine organisms among these are Large Benthic Foraminifera. These symbiont bearing protists are major carbonate producers and ecosystems engineers. To assess the relative contribution of host and symbiont algae to the holobiont thermal tolerance we evaluated calcification rate and photosynthetic activity under future warming scenarios. Our study demonstrates the role of pre-exposure and acclimation processes of host, symbionts or both in mitigating future warming.
Future warming threatens many marine organisms among these are Large Benthic Foraminifera. These...
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