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Jennifer Fehrenbacher, Assistant Professor, OSU College of Earth, Ocean, and Atmos. Sciences

Improving paleoclimate reconstructions with culture-based experiments and novel analytical techniques

Thursday, March 23, 2017 3:30 PM - 4:30 PM

Improving paleoclimate reconstructions with culture-based experiments and novel analytical techniques

Planktic foraminifera are widely used for reconstructing past ocean environments. I conduct experiments with living planktic foraminifers to calibrate shell geochemistry to growth conditions and elucidate biomineralization processes. For example, the relationship between seawater temperature and the average Mg/Ca ratios in planktic foraminifera is well established, providing an essential tool for reconstructing past ocean temperatures. However, many species display alternating high and low Mg-bands within their shell walls that cannot be explained in terms of temperature alone. Our experimental results reveal high Mg/Ca-calcite forms at night in cultured specimens of the thermocline dwelling multi-chambered species Neogloboquadrina dutertrei.  These results have implications for interpreting patterns of calcification in N. dutertrei, and suggest that diurnal Mg-banding is an intrinsic component of biomineralization in planktic foraminifera.  


OSU Hatfield Marine Science Center
Guin Library Seminar Room
2030 SE Marine Science Drive
Newport
OR
maryann.bozza at oregonstate.edu
Hatfield Marine Sci Ctr
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