Biocalcification in porcelaneous foraminifera.

Autor:	Dubicka Z; Ecological Chemistry, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.; GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, Germany.; Faculty of Geology, University of Warsaw, Warsaw, Poland., Tyszka J; Research Centre in Kraków, Institute of Geological Sciences, Polish Academy of Sciences, Kraków, Poland., Pałczyńska A; Faculty of Geology, University of Warsaw, Warsaw, Poland., Höhne M; Ecological Chemistry, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Bijma J; Marine Biogeosciences, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Jense M; Burgers' Ocean, Royal Burgers' Zoo, Arnhem, Netherlands., Klerks N; Burgers' Ocean, Royal Burgers' Zoo, Arnhem, Netherlands., Bickmeyer U; Ecological Chemistry, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.
Jazyk:	angličtina
Zdroj:	ELife [Elife] 2024 Aug 16; Vol. 13. Date of Electronic Publication: 2024 Aug 16.
DOI:	10.7554/eLife.91568
Abstrakt:	Living organisms control the formation of mineral skeletons and other structures through biomineralization. Major phylogenetic groups usually consistently follow a single biomineralization pathway. Foraminifera, which are very efficient marine calcifiers, making a substantial contribution to global carbonate production and global carbon sequestration, are regarded as an exception. This phylum has been commonly thought to follow two contrasting models of either in situ 'mineralization of extracellular matrix' attributed to hyaline rotaliid shells, or 'mineralization within intracellular vesicles' attributed to porcelaneous miliolid shells. Our previous results on rotaliids along with those on miliolids in this paper question such a wide divergence of biomineralization pathways within the same phylum of Foraminifera. We have found under a high-resolution scanning electron microscopy (SEM) that precipitation of high-Mg calcitic mesocrystals in porcelaneous shells takes place in situ and form a dense, chaotic meshwork of needle-like crystallites. We have not observed calcified needles that already precipitated in the transported vesicles, what challenges the previous model of miliolid mineralization. Hence, Foraminifera probably utilize less divergent calcification pathways, following the recently discovered biomineralization principles. Mesocrystalline chamber walls in both models are therefore most likely created by intravesicular accumulation of pre-formed liquid amorphous mineral phase deposited and crystallized within the extracellular organic matrix enclosed in a biologically controlled privileged space by active pseudopodial structures. Both calcification pathways evolved independently in the Paleozoic and are well conserved in two clades that represent different chamber formation modes. Competing Interests: ZD, JT, AP, MH, JB, MJ, NK, UB No competing interests declared (© 2024, Dubicka et al.)
Databáze:	MEDLINE
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