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Changes in Bioenergetics Associated with Ocean Acidification and Climate Changes

Kunshan Gao

Ocean global changes, including CO2-triggered ocean acidification and warming as well as associated changes in physical and chemical environments affect metabolisms of marine organisms and increase their energetic demand to cope with the environmental stresses. Phytoplankton species grown under ocean acidification conditions alter their metabolic pathways, down-regulating their CO2 concentrating mechanisms, up-regulating photorespiration and heatdissipating processes and generating extra energy by degrading accumulated phenolic compounds, which are toxic and can be transferred to higher trophic levels, changing food quality. Calcifying algae, under influence of ocean acidification, need more energy to maintain their calcification and to synthesize UV screening compounds due to reduced thickness of the calcified "shell". Changes in the bioenergetics with exacerbating ocean global environmental issues will lead to ecological consequences and affect services of marine ecosystems.