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[演講公告]A coastal coccolithophore maintains pH homeostasis and switches carbon sources in response to ocean acidification

Friday, December 21, 2018, 11:00 - 12:00
Location 地理系館202教室
講者: 劉怡偉,中央研究院地球科學研究所 博士後研究
演講大綱:

Ocean acidification will potentially inhibit calcification by marine organisms; however, the response of the most prolific ocean calcifiers, coccolithophores, to this perturbation remains under characterized. Here we report novel chemical constraints on the response of the widespread coccolithophore species Ochrosphaera neapolitana (O. neapolitana) to changing- CO2 conditions. We cultured this algae under three pCO2-controlled seawater pH conditions (8.05, 8.22, and 8.33). Boron isotopes within the algae’s extracellular calcite plates show that this species maintains a constant pH at the calcification site, regardless of CO2-induced changes in pH of the surrounding seawater. Carbon and oxygen isotopes in the algae’s calcite plates and carbon isotopes in the algae’s organic matter suggest that O. neapolitana utilize carbon from a single internal dissolved inorganic carbon (DIC) pool for both calcification and photosynthesis, and that a greater proportion of dissolved CO2 relative to HCO3 enters the internal DIC pool under acidified conditions. These two observations may explain how O. neapolitana continues calcifying and photosynthesizing at a constant rate under different atmospheric-pCO2 conditions.

講者簡介:

Dr. Liu graduated from the Department of Geosciences, NTU in 2008 for bachelor degree and in 2010 for master degree. She then received a doctoral degree at University of Michigan. Currently, she is a postdoctoral fellow at the Institute of Earth Sciences, Academia Sinica. Her research interests focuse on using different stable and radiogenic isotopic systems to explore climate change and environment over different time scales and the potential impacts of climate change on different calcifying organisms.

學術召集:
Contact 趙荃敏 3366-5833
附件:
1071221演講公告_劉怡偉.pdf

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