Data from: Evolutionary ecology of Early Paleocene planktonic foraminifera: size, depth habitat and symbiosis ...

• Main Authors: Birch, Heather S., Coxall, Helen K., Pearson, Paul N.
• Format: Dataset
• Language: English
• Published: Dryad 2012
• Subjects: Planktonic foraminifera; Foraminifera; Photosymbiosis; Early Paleocene; Metabolic fractionation; Cretaceous/Paleogene boundary
• Online Access: https://dx.doi.org/10.5061/dryad.5p92t38g; https://datadryad.org/stash/dataset/doi:10.5061/dryad.5p92t38g

The carbon stable isotope (δ13C) composition of the calcitic tests of planktonic foraminifera has an important role as a geochemical tracer of ocean carbon system changes associated with the Cretaceous/Paleogene (K/Pg) mass extinction event and its aftermath. Questions remain, however, about the extent of δ13C isotopic disequilibrium effects and the impact of depth habitat evolution on test calcite δ13C among rapidly evolving Paleocene species, and the influence this has on reconstructed surface-to-deep ocean dissolved inorganic carbon (DIC) gradients. A synthesis of new and existing multispecies data, on the relationship between δ13C and δ18O and test size, sheds light on these issues. Results suggest that early Paleocene species quickly radiated into a range of depths habitats in a thermally stratified water column. Negative δ18O gradients with increasing test size in some species of Praemurica suggest either ontogenetic or ecotypic dependence on calcification temperature that may reflect depth/light ... : Supplementary Figure 1Stable isotopic signals of multiple size fractions of 13 early Paleocene planktonic foraminifera species. For each time slice, plot (1) shows δ18O against test size, plot (2) carbon δ13C against test size and plot (3) δ13C verses δ18O, (cross plots are a typical method for interpreting planktonic foraminifera depth habitats and are therefore useful for comparison of our results with the wider literature). Test size is represented as the mid point in the upper and lower sieve size range. Genera abbreviations as follows M = Morozovella, Pr = Praemurica, S = Subbotina, P = Parasubbotina, E = Eoglobigerina, C = Chiloguembelina, G = Guembelitria, Pa = Parvularugoglobigerina and W = Woodringina. Grey vertical dashed lines indicate approximate onset of adult ecology for planktonic foraminifera according to Brummer et al. (1987). Time Slice D, H, I, J, K, M, P and Q data, this study. A to C data from D’Hondt and Zachos (1993), DSDP Site 528 and 577 and E, G, L, N, O and R from Norris (1996), ...