Characterization of calcite spines of planktonic foraminifers (Globigerinidae)

Izumida, Kenta; Takasaki, Mihiro; Fujimaki, Rina; Nagai, Yukiko; Oaki, Yuya; Naito, Kimiyoshi; Tanaka, Yoshihisa; Shimode, Shinji; Toyofuku, Takashi; Imai, Hiroaki

doi:10.1039/d2ce00110a

Cited by 2 publications

(1 citation statement)

References 27 publications

(39 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure S1 in Supporting Information S1). These different calcite phases exhibit different morphologies, are formed by different mechanisms, result in different M/Ca compositions, and are hence expected to differ in crystallographic aspects (Izumida et al, 2022;Schiebel & Hemleben, 2017). However, only one dominant crystalline Mg-calcite phase is visible in the diffraction patterns of the hyaline foraminifers (Figures 2a and 2b).…”

Section: Crystallite Size Determination By Rietveld and Pdfmentioning

confidence: 99%

Mesocrystalline Architecture in Hyaline Foraminifer Shells Indicates a Non‐Classical Crystallisation Pathway

Arns

Evans

Schiebel

et al. 2022

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Calcareous foraminifers are an abundant group of planktic and benthic marine unicellular organisms, which together constitute an important component of the global carbon cycle (Langer, 2008;Schiebel, 2002). Foraminifer shells (tests) can resist dissolution and diagenesis over millions of years, and hence provide an outstanding archive for climate reconstruction at high time resolution from sediment cores, which is possible via empirical calibration of chemical or physical characteristics of the shells of recent species (e.g., Fischer & Wefer, 1999;Katz et al., 2010). Despite their importance as a paleoclimate archive, the biomineralization of foraminifers is not mechanistically understood in detail, which leaves the fundamental relationship between environmental parameters and proxy data enigmatic. For example, the possible presence of residues of metastable carbonate phases such as vaterite was only recently discovered (Jacob et al., 2017), and the delivery of ions to the biomineralization site is an ongoing topic of debate (

show abstract

Section: Crystallite Size Determination By Rietveld and Pdfmentioning

confidence: 99%

Mesocrystalline Architecture in Hyaline Foraminifer Shells Indicates a Non‐Classical Crystallisation Pathway

Arns

Evans

Schiebel

et al. 2022

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

The calcitic test growth rate of Spirillina vivipara (Foraminifera)

Nagai,

Uematsu,

Mamo

et al. 2024

Biogeosciences

Self Cite

View full text Add to dashboard Cite

Abstract. Foraminifera encompass vastly differing morphologies, ecological preferences, and elemental/isotopic test compositions. The calcification mechanism is completely unknown for some wall-type taxa and might be different from that of well-studied groups. This study aims to understand the test growth and determine the calcification rate of Spirillina vivipara Ehrenberg, 1843 (order Spirillinida) and to compare them to other foraminiferal species. Spirillinids have a closely coiled spiral chamber like a tube, yet their calcitic microstructure is unique amongst foraminifera. Calcification observations in S. vivipara facilitate the estimation of carbonate precipitation rates during active test growth, which are revealed to be independent of the individual's size. Spirillina vivipara grows its test in response to food availability, suggesting that calcification directly corresponds to cell growth. Time-lapse observations of S. vivipara indicate continuous growth, suggesting active growth phases interspersed with resting periods, hinting at potential biological rhythms in the growth and calcification process. We also implemented a 24 h observation period using calcein staining, showing calcite precipitation rates of 8.08 µm h−1, which corresponds to approximately 364 nmol cm−2 min−1 (i.e., 36.4 mg cm−2 min−1). These rates are higher than those of other foraminiferal species and those in most inorganic precipitation experiments. Such high rates in spirillinid foraminifera may explain their distinctive morphology, elemental composition, unusual reproduction, and ecological distribution.

show abstract

Characterization of calcite spines of planktonic foraminifers (Globigerinidae)

Abstract: Calcitic spines ∼1 μm in diameter are projecting from a trochospiral test of a spinose planktonic foraminifer. According to electron diffraction, Raman spectra, and detailed electron microscope observation, the spines...

Cited by 2 publications

References 27 publications

Mesocrystalline Architecture in Hyaline Foraminifer Shells Indicates a Non‐Classical Crystallisation Pathway

Mesocrystalline Architecture in Hyaline Foraminifer Shells Indicates a Non‐Classical Crystallisation Pathway

The calcitic test growth rate of Spirillina vivipara (Foraminifera)

Contact Info

Product

Resources

About