Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea

Aleksey Yu Sadekov, Kate F. Darling, Toyoho Ishimura, Christopher M. Wade, Katsunori Kimoto, Arun Deo Singh, Pallavi Anand, Dick Kroon, Simon Jung, Gerald Ganssen, Raja Ganeshram, Urumu Tsunogai, Henry Elderfield

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Planktonic foraminifera record oceanic conditions in their shell geochemistry. Many palaeoenvironmental studies have used fossil planktonic foraminifera to constrain past seawater properties by defining species based on their shell morphology. Recent genetic studies, however, have identified ecologically distinct genotypes within traditionally recognized morphospecies, signaling potential repercussions for palaeoclimate reconstructions. Here we demonstrate how the presence of Globigerina bulloides cryptic genotypes in the Arabian Sea may influence geochemical signals of living and fossil assemblages of these morphospecies. We have identified two distinct genotypes of G. bulloides with either cool water (type-II) or warm water (type-I) temperature preferences in the Western Arabian Sea. We accompany these genetic studies with analyses of Mg/Ca and stable oxygen isotope (δ18O) compositions of individual G. bulloides shells. Both Mg/Ca and δ18O values display bimodal distribution patterns. The distribution of Mg/Ca values cannot be simply explained by seawater parameters, and we attribute it to genotype-specific biological controls on the shell geochemistry. The wide range of δ18O values in the fossil assemblage also suggests that similar controls likely influence this proxy in addition to environmental parameters. However, the magnitude of this effect on the δ18O signals is not clear from our data set, and further work is needed to clarify this. We also discuss current evidence of potential genotype-specific geochemical signals in published data on G. bulloides geochemistry and other planktonic foraminiferal species. We conclude that significant caution should be taken when utilizing G. bulloides geochemistry for paleoclimate reconstruction in the regions with upwelling activity or oceanographic fronts.

Original languageEnglish
Pages (from-to)1440-1452
Number of pages13
JournalPaleoceanography
Volume31
Issue number10
DOIs
Publication statusPublished - 1 Oct 2016

Fingerprint

genotype
geochemistry
shell
fossil assemblage
planktonic foraminifera
paleoclimate
seawater
cool water
warm water
biological control
oxygen isotope
upwelling
stable isotope
sea
fossil
temperature
parameter
distribution

Keywords

  • genetic variability
  • geochemistry
  • Mg/Ca thermometry
  • paleoclimate
  • planktonic foraminifera
  • proxy reconstructions

Cite this

Sadekov, A. Y., Darling, K. F., Ishimura, T., Wade, C. M., Kimoto, K., Singh, A. D., ... Elderfield, H. (2016). Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea. Paleoceanography, 31(10), 1440-1452. https://doi.org/10.1002/2016PA002947
Sadekov, Aleksey Yu ; Darling, Kate F. ; Ishimura, Toyoho ; Wade, Christopher M. ; Kimoto, Katsunori ; Singh, Arun Deo ; Anand, Pallavi ; Kroon, Dick ; Jung, Simon ; Ganssen, Gerald ; Ganeshram, Raja ; Tsunogai, Urumu ; Elderfield, Henry. / Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea. In: Paleoceanography. 2016 ; Vol. 31, No. 10. pp. 1440-1452.
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Sadekov, AY, Darling, KF, Ishimura, T, Wade, CM, Kimoto, K, Singh, AD, Anand, P, Kroon, D, Jung, S, Ganssen, G, Ganeshram, R, Tsunogai, U & Elderfield, H 2016, 'Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea' Paleoceanography, vol. 31, no. 10, pp. 1440-1452. https://doi.org/10.1002/2016PA002947

Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea. / Sadekov, Aleksey Yu; Darling, Kate F.; Ishimura, Toyoho; Wade, Christopher M.; Kimoto, Katsunori; Singh, Arun Deo; Anand, Pallavi; Kroon, Dick; Jung, Simon; Ganssen, Gerald; Ganeshram, Raja; Tsunogai, Urumu; Elderfield, Henry.

In: Paleoceanography, Vol. 31, No. 10, 01.10.2016, p. 1440-1452.

Research output: Contribution to JournalArticleAcademicpeer-review

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Sadekov AY, Darling KF, Ishimura T, Wade CM, Kimoto K, Singh AD et al. Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea. Paleoceanography. 2016 Oct 1;31(10):1440-1452. https://doi.org/10.1002/2016PA002947