Ambidextrous Microbes May Pump Out CO2 as Temperatures Rise

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https://eos.org/articles/ambidextrous-microbes-may-pump-out-co2-as-temperatures-rise

By Katherine Kornei, Eos/AGU. 

Excerpt: Some tiny forms of life double-dip to sustain themselves: They’re both photosynthetic and predatorial. But as the planet warms, such “mixotrophic microbes” are apt to shift away from being sunlight driven to being more predatory, researchers have found. And because photosynthesis consumes carbon dioxide (CO2) and respiration expels the greenhouse gas, that transition has important implications for the climate. Furthermore, the early-warning signs that signal an impending shift from a carbon sink state to a carbon source state are muted in the presence of high levels of nutrients, the team reported in Functional Ecology....The collective amount of all the CO2 that mixotrophic microbes are capable of sequestering or releasing is apt to be substantial, Wieczynski said. That’s because the combined biomass of Earth’s microbes, including bacteria and plantlike organisms known as protists, exceeds that of animals by roughly a factor of 40, according to recent estimates....

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