Dataset: Globorotaloides hexagonus trace element ablation profiles from samples collected from MOCNESS tows from R/V Sikuliaq cruise SKQ201701S in 2017

ValidatedFinal no updates expectedDOI: 10.26008/1912/bco-dmo.919606.1Version 1 (2024-02-01)Dataset Type:Cruise Results

Principal Investigator: Catherine Davis (North Carolina State University)

Scientist: Shannon Doherty (North Carolina State University)

Scientist: Jennifer Fehrenbacher (Oregon State University)

Scientist: Karen Wishner (University of Rhode Island)

BCO-DMO Data Manager: Amber D. York (Woods Hole Oceanographic Institution)


Project: Glacial-Interglacial Changes in Oxygen Minimum Zones Using Deep-Dwelling, Low-Oxygen Planktic Foraminifera (OMZ forams)


Abstract

The planktic foraminifer Globorotaloides hexagonus is found in temperate to tropical oxygen minimum zones (OMZs). Their preferred habitat make G. hexagonus an important species for the development of oxygen-related paleoproxies. Here we report trace-element-to-calcium (TE/Ca) ratios with depth in the shell of G. hexagonus from the Eastern Tropical North Pacific (21 N, 117 W) . Individuals were isolated from a series of Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS) tows ...

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Detailed methodology for MOCNESS tows can be found in Wishner et al. (2018). Briefly,  a 1 m2 MOCNESS fitted with 222 micron nets was used to collect vertically stratified environmental data and plankton samples (9 nets per tow, 0-1000 m, 25-100 m intervals).  Some tows also targeted oxygen minimum zone features. Nets were rinsed with filtered seawater and whole samples were preserved in 4% sodium-borate buffered formaldehyde. 

Detailed methodology for sample preparation and analysis can be found in Davis et al. (2023). Foraminifera with intact cytoplasm were isolated from tow material to ensure samples were living at the time of collection. Shells of G. hexagonus were subjected to oxidative cleaning: shells were bathed individually in a 1:1 mixture of NaOH and H2O2 for 10 minutes, then rinsed in deionized water. Shells were then mounted on carbon conductive tape on a glass slide. Trace element analysis was completed at the College of Earth, Ocean, and Atmospheric Sciences at Oregon State University using a laser ablation system (Photon Machines 193 nm ArF laser with an ANU HelEx dual-volume laser ablation cell, 65 mm spot size, a 4 Hz rep rate, and a fluence of 0.85 J cm-2) coupled to an iCAP quadrupole ICP-MS. Standards NIST 610 and NIST 612 were ablated every 10 samples. 


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Related Publications

Results

Davis, C. V., Doherty, S., Fehrenbacher, J., & Wishner, K. (2023). Trace element composition of modern planktic foraminifera from an oxygen minimum zone: Potential proxies for an enigmatic environment. Frontiers in Marine Science, 10. https://doi.org/10.3389/fmars.2023.1145756
Results

Davis, C. V., Wishner, K., Renema, W., & Hull, P. M. (2021). Vertical distribution of planktic foraminifera through an oxygen minimum zone: how assemblages and test morphology reflect oxygen concentrations. Biogeosciences, 18(3), 977–992. doi:10.5194/bg-18-977-2021
Results

Wishner, K. F., Seibel, B. A., Roman, C., Deutsch, C., Outram, D., Shaw, C. T., … Riley, S. (2018). Ocean deoxygenation and zooplankton: Very small oxygen differences matter. Science Advances, 4(12), eaau5180. doi:10.1126/sciadv.aau5180
Software

Branson, O., Fehrenbacher, J. S., Vetter, L., Sadekov, A. Y., Eggins, S. M., & Spero, H. J. (2019). LAtools: A data analysis package for the reproducible reduction of LA-ICPMS data. Chemical Geology, 504, 83–95. https://doi.org/10.1016/j.chemgeo.2018.10.029