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Colloquium: Tomoko Bell, University of Tokyo
December 6, 2018 @ 2:30 pm - 4:00 pmFree
Our KU Geology Colloquium guest on Thursday, December 6, will be Tomoko Bell, researcher at the Analytical Center for Environmental Study, Atmosphere and Ocean Research Institute, University of Tokyo. Dr. Bell will present:
Evaluation of paleotemperature proxy using coral genome biology
Colloquium will be held in the Beren Petroleum Center, Slawson Hall, with a reception at 2:30 p.m. followed by colloquium at 3:00 p.m. All are welcome to attend.
Coral skeletons are robust tools for examining past environments. However, biogenic effects during skeletal formation cause uncertainties in paleoclimate reconstructions.Thus establishing a method to separate biogenic effects from abiogenic ones during skeletal formation is required. We utilized an open access and searchable gene database for the stag horn coral Acropora digitifera and examined the number of genes related to the elements in seawater to assess the origin of uncertainties in geochemical proxies. We found that A. digitifera has genes that can process at least 15 chemical elements as individual substances (Ca, Na, Zn, K, C, N, Cl, S, Fe, Mg, Mn, Cu, H, Mo, and Te) and transporters for seven of these elements (Ca, Na, Zn, K, Cl, Cu, and H). The number of Ca-relatedgenes was the highest (at least 428 genes, including 53 transporters), whereas Sr, one of the most widely used geochemical proxies, was not found in the gene database. Furthermore, we analyzed skeletal samples of A. digitifera exhibiting different growth rates; their Sr/Ca ratios showed the lowest variation (1.9%), whereas other proxies (K/Ca, Na/Ca, and Mg/Ca) showed higher variation (2.3–11.9%).This might be linked to the number of genes related to the proxies (namely, the magnitude of biogenic and/or abiogenic effects). We suggest that considering elements with no relevant coral genes could provide effective criteria for reliable proxies (e.g.,Sr/Ca, Li/Ca and U/Ca).