Preprints
https://doi.org/10.5194/bg-2021-138
https://doi.org/10.5194/bg-2021-138

  03 Jun 2021

03 Jun 2021

Review status: a revised version of this preprint is currently under review for the journal BG.

Photosynthetic activity in Devonian Foraminifera

Zofia Dubicka1,2, Maria Gajewska1, Wojciech Kozłowski1, Pamela Hallock3, and Johann Hohenegger4 Zofia Dubicka et al.
  • 1Faculty of Geology, University of Warsaw, Warsaw, Poland
  • 2Ecological Chemistry, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany
  • 3College of Marine Science, University of South Florida, St. Petersburg, USA
  • 4Department of Palaeontology, Universität Wien, Wien, Austria

Abstract. Photosynthetically-active foraminifera are important carbonate producers contributing nearly 5 % of the reef and nearly 1 % of the total global calcium carbonate budgets. The abilities to be photosynthetically active, foraminifera realize by endosymbiosis with microalgae or by sequestering plastids (kleptoplasts) of digested algae. These ecological behaviors are a great advantage for the continued growth, survival of the hosts and enhance of foraminiferal calcification. Our data provide concurrent pieces of evidence for, as of now, the earliest (mid-Devonian) photosymbiosis in protists observed in the first true advanced multichambered calcareous foraminifera Semitextularia from the tropical shelf of the Laurussia paleocontinent. This adaptation might have had a significant impact on the evolutionary radiation of calcareous Foraminifera in the Devonian (“Givetian revolution”), which was one of the most important evolutionary events in foraminiferal history. The observed phenomenon coincided with the worldwide development of diverse calcifying marine communities inhabiting shelf environments linked with Devonian stromatoporoid-coral reefs.

Zofia Dubicka et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2021-138', Antonino Briguglio, 16 Jun 2021
    • AC2: 'Reply on RC1', Maria Gajewska, 25 Jun 2021
  • RC2: 'Comment on bg-2021-138', Marcelle BouDagher-Fadel, 16 Jun 2021
    • AC3: 'Reply on RC2', Maria Gajewska, 25 Jun 2021

Zofia Dubicka et al.

Zofia Dubicka et al.

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Short summary
Benthic foraminifera play a significant role in modern reefal ecosystems mainly due to their symbiosis with photosynthetic microorganisms. Foraminifers were also components of Devonian stromatoporoid-coral reefs however, whether they could have harbored symbionts remained unsolved. We show that Devonian foraminifers might have stayed photosynthetically active what likely had an impact on their evolutionary radiation and possibly also on the functioning of Palaeozoic shallow-marine ecosystems.
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