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Title: Link between light-triggered Mg-banding and chamber formation in the planktic foraminifera Neogloboquadrina dutertrei

Mg/Ca ratios of planktic foraminifera are commonly used to reconstruct past ocean temperatures. However, intrashell Mg/Ca ratios exhibit a pattern of alternating high and low Mg-bands in many species. Whereas mechanisms controlling Mg variability are poorly constrained, recent experiments demonstrate that it is paced by the diurnal light/dark cycle in Orbulina universa, which forms a terminal shell of simple spherical geometry. It is unknown whether Mg-heterogeneity is diurnally paced in species with complex shell morphologies, or is the result of growth processes. Here, we show that high Mg/Ca-calcite also forms at night in cultured specimens of the multi-chambered planktic foraminifera Neogloboquadrina dutertrei. Our results demonstrate that N. dutertrei adds a significant amount of calcite, and nearly all Mg-bands, after the final chamber forms. Furthermore, these results have implications for interpreting patterns of calcification in N. dutertrei, and possibly other foraminifera species, and suggests diurnal Mg-banding is an intrinsic component of biomineralization in planktic foraminifera.
 [1] ; ORCiD logo [2] ;  [2] ;  [3] ;  [2] ;  [4] ;  [4] ;  [5]
  1. Oregon State Univ., Corvallis, OR (United States); Univ. of California, Davis, CA (United States)
  2. Univ. of California, Davis, CA (United States)
  3. Univ. of Washington, Seattle, WA (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  5. Indianapolis, IN (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 2041-1723; 48564; KP1704020
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Nature Publishing Group
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org:
Country of Publication:
United States
59 BASIC BIOLOGICAL SCIENCES; Environmental Molecular Sciences Laboratory; biogeochemistry; marine biology; palaeoceanography
OSTI Identifier: