Τίτλος:
Influence of surface ocean density on planktonic foraminifera calcification
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
This study provides evidence that ambient seawater density influences calcification and may account for the observed planktonic foraminifera shell mass increase during glacial times. Volumes of weighed fossil Globigerina bulloides shells were accurately determined using X-ray Computer Tomography and were combined with water density reconstructions from Mg/Ca and δ18O measurements to estimate the buoyancy force exerted on each shell. After assessment of dissolution effects, the resulting relationship between shell mass and buoyancy suggests that heavier shells would need to be precipitated in glacial climates in order for these organisms to remain at their optimum living depth, and counterbalance the increased buoyant force of a denser, glacial ocean. Furthermore, the reanalysis of bibliographic data allowed the determination of a relationship between G. bulloides shell mass and ocean density, which introduces implications of a negative feedback mechanism for the uptake of atmospheric CO2 by the oceans. © 2019, The Author(s).
Συγγραφείς:
Zarkogiannis, S.D.
Antonarakou, A.
Tripati, A.
Kontakiotis, G.
Mortyn, P.G.
Drinia, H.
Greaves, M.
Περιοδικό:
Scientific Reports
Εκδότης:
Nature Publishing Group
Λέξεις-κλειδιά:
calcium; magnesium; oxygen; sea water, anatomy and histology; bone mineralization; chemistry; climate; foraminifer; fossil; physiology; plankton; sea; temperature, Calcification, Physiologic; Calcium; Climate; Foraminifera; Fossils; Magnesium; Oceans and Seas; Oxygen Isotopes; Plankton; Seawater; Temperature
DOI:
10.1038/s41598-018-36935-7
