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Phytoplankton are microscopic organisms at the base of the ocean’s food chain and a key component of a critical biological carbon pump.

Oregon State microbiology research furthers understanding of ocean’s role in carbon cycling

By Steve Lundeberg
Taking a closer look at marine microbes gives insight into their role in sequestering carbon. 

Researchers from the Department of Microbiology have shed new light on the mechanisms of carbon cycling in the ocean, using a novel approach to track which microbes are consuming different types of organic carbon produced by common phytoplankton species.

The research is an important step toward forecasting how much carbon will leave the ocean for the atmosphere as greenhouse gas carbon dioxide and how much will end up entombed in marine sediments, said Ryan Mueller, associate professor of microbiology and the leader of the study.

Findings were published today in the Proceedings of the National Academy of Sciences.

“Our research shows that different species of microbes in the ocean are very particular yet predictable in the food sources they prefer to eat,” said first author Brandon Kieft (Ph.D. Microbiology '14), currently a postdoctoral researcher at the University of British Columbia. “As global climate change continues to alter oceanic environments at a rapid pace, the availability of food sources for microbes will also change, ultimately favoring certain types over others.”

The research was funded by the Gordon and Betty Moore Foundation Marine Biology Initiative and the U.S. Department of Energy. 

Read the full story here

Marine microbes consume different types of organic carbon
Different types of plankton create different types of organic carbon, which heterotrophic microbes produce in turn, as part of the critical marine carbon pump.