TY - JOUR
T1 - MORPHOTYPICAL AND GEOCHEMICAL VARIATIONS OF PLANKTIC FORAMINIFERAL SPECIES IN SIBERIAN AND CENTRAL ARCTIC OCEAN CORE TOPS
AU - Prabhakar, Maya
AU - Thirumalai, Kaustubh
AU - Cronin, Thomas M.
AU - Gemery, Laura
AU - Thomas, Elizabeth K.
AU - Rafter, Patrick A.
N1 - Publisher Copyright:
© 2024 Cushman Foundation. All rights reserved.
PY - 2024/1
Y1 - 2024/1
N2 - In this work, we utilize a transect of core top, mid- to late Holocene, sediments from the Eastern Siberian Sea to the central Arctic Ocean, spanning gradients in upper-ocean water column properties, to examine regional planktic foraminiferal species abundances and geochemistry. We present species- and morphotype-specific foraminiferal assemblages at these sites and stable isotope analyses of neogloboquadrinids. We find little variation in planktic species populations, and only small variations in N. pachyderma morphotype distributions, between sites. Spatial averages of N. pachyderma morphotype and N. incompta δ18O values show no significant differences, suggesting a similar calcification depth for all morphotypes of N. pachyderma and N. incompta across our sites, which we estimate to be between ∼ 50–150 m. Values of δ18O of a group of unencrusted specimens delineate a shallower calcification habitat. Neogloboquadrina pachyderma-2 Mg/Ca values yield temperatures outside the range of observations using available calibration equations, pointing toward the need for more Arctic-specific Mg/Ca-temperature calibrations.
AB - In this work, we utilize a transect of core top, mid- to late Holocene, sediments from the Eastern Siberian Sea to the central Arctic Ocean, spanning gradients in upper-ocean water column properties, to examine regional planktic foraminiferal species abundances and geochemistry. We present species- and morphotype-specific foraminiferal assemblages at these sites and stable isotope analyses of neogloboquadrinids. We find little variation in planktic species populations, and only small variations in N. pachyderma morphotype distributions, between sites. Spatial averages of N. pachyderma morphotype and N. incompta δ18O values show no significant differences, suggesting a similar calcification depth for all morphotypes of N. pachyderma and N. incompta across our sites, which we estimate to be between ∼ 50–150 m. Values of δ18O of a group of unencrusted specimens delineate a shallower calcification habitat. Neogloboquadrina pachyderma-2 Mg/Ca values yield temperatures outside the range of observations using available calibration equations, pointing toward the need for more Arctic-specific Mg/Ca-temperature calibrations.
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U2 - 10.2113/gsjfr.54.1.1
DO - 10.2113/gsjfr.54.1.1
M3 - Article
AN - SCOPUS:85188847278
SN - 0096-1191
VL - 54
SP - 1
EP - 19
JO - Journal of Foraminiferal Research
JF - Journal of Foraminiferal Research
IS - 1
ER -