Microbes Run the Show

Researchers in the Dry LabWho is Doing What?

One crucial aspect of microbial communities that researchers want to understand can be summed up in the cheeky question "Who is doing what?" This is important to understand because of the delicate connections between all marine and terrestrial life, granting us a start to inferring the microscopic "winners" and "losers" in the face of Climate Change.

To do so, Hugo is studying the Nitrogen Cycle. Nitrogen is a key nutrient at the very base of the food chain, both on land and in the ocean. Its availability directly impacts the global marine ecosystem. Many microorganisms feast, grow, and live off of it. Once the microorganisms reach a certain size (or die), they will sink, dragging carbon - in the shape of organic matter - down with them. Once carbon leaves the superficial layers of the ocean and enters deep waters, it will be gone for thousands or even millions of years. As it stands today, a healthy functioning carbon sink is probably good news. This carbon pump has been working for thousands of years, helping regulate the Earth's chemistry and temperature.

Understanding how available Nitrogen is for microbes to feed on, along with how different organisms are able to transform Nitrogen after they have ingested it, directly relates to the inner-workings of the biological carbon pump

He first collects water samples from the surface and from Niskin bottles deployed in CTD casts at the Deep Chlorophyll Maximum depth of 150 meters. The, using an incubator, he enriches the water with a stable form of Nitrogen (N15) while maintaining the microbial communities natural conditions, including light and temperature. After a day of incubation, he filters the water and freezes the samples, hence preserving each organism. Once back ashore, flow cytometry cell sorting

Every microorganism specializes in one single task, transforming one chemical element into another and fuelling our planet's biochemical system. Therefore, changes in microbial populations will inevitably affect Earth's chemistry. Once the snowball of a changing climate has begun rolling, it will trigger other factors - such as changes in oceanic microscopic ecology - which will in turn add to the snowball's speed and impact. Figuring out what life inside a drop of seawater may look like in the future is essential knowledge for researchers to understand what the future may hold.

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