378 / 2024-09-15 19:16:37
The effect of ocean acidification on methane production in Emiliania huxleyi is modulated by temperature changes
Methane,Emiliania huxleyi,ocean acidification,ocean warming
Session 9 - Global Ocean Changes: Regional Processes and Ecological Impacts
Abstract Accepted
Most phytoplankton species have been shown to release CH4, one of the potent greenhouse gases. However, little has been documented on how changed levels of CO2 and temperatures affect their CH4 producing capacity along with photosynthetic C fixation. Here, we examined CH4 production and photosynthetic performance in the most cosmopolitan coccolithophorid, Emiliania huxleyi, grown under high (1000 ppmv, HC) and low (410 ppmv, LC) CO2 levels at five temperatures (16, 20, 22, 24 and 27 ℃). The HC treatment did not affect growth but significantly reduced the optimal temperature for CH4 production, and changes in temperature significantly affected both carbon fixation and CH4 production. The calculated CH4 production quotient (MPQ, CH4 released vs. CO2 fixed) showed a decreased trend with the increasing temperature under the two pCO2 levels, implying that the CH4 production by this microalga will be affected by future global ocean changes, and the CH4 produced by phytoplankton should be quantified and included in assessing the feedback of marine photosynthetic microorganisms to climate change.