The Nansen Legacy Project Blog

Some of the benthos team labelling and preparing samples before they get muddy.

Let’s talk dirty

The seabed and the animals living there are collectively called, the benthos and it is one of the largest and most diverse habitats on the planet.

A marine worm (polychaete) burrowing deep in the sediment in one of our subsampling cores.

Water, water everywhere on this blue planet. But there is also a dirtier side to the sea, because under the waves is solid (though often muddy) ground. Even dirt from land eventually reaches and lays to rest on the seafloor. The ground beneath the sea is in fact, critical for maintaining a healthy planet.

Most people don’t realize that since nature documentaries are literally more wishy washy in their focus. Plus, I admit, mud, dirt and grime are not particularly charismatic. Even my colleagues on board are terrified of setting foot into my lab or being on deck when seafloor sampling is taking place. But if you are willing to get your hands dirty, a whole new world opens up.

The seabed and the animals living there are collectively called, the benthos and it is one of the largest and most diverse habitats on the planet.

Burrows of benthic animals visible in one of our subsampling cores.

Food is literally dirt cheap since a common feeding strategy of benthic animals is gobbling up dirt and sustaining themselves on the organic material rolled up within the dirt. Other animals filter water and eat whatever gets stuck on their biological sieves.

Similar to life on land, benthic animals crawl or walk on the surface of the seafloor, or burrow into tunnels. This takes carbon from the surface of the seafloor to deeper in the sediment. That carbon is then safe from getting washed away by every passing current, so it gets stored and sequestered under(marine)ground.

At the global scale, this has a huge effect. The seabed is where carbon goes to die and remain locked away, which takes it out of the atmosphere. In fact, the deep ocean is the biggest reservoir of carbon in the world. In other words, all those dirty little animals are critical for maintaining carbon budgets and preventing runaway greenhouse effects.

Sampling and sub-sampling the seafloor.

So even if the Nansen Legacy ‘s benthos team and I have a dirty job, there is a method to our muddiness. And in the end, we get the dirt on everyone else’s study subjects.

Welcome to a journey through the Arctic!

This blog is written by researchers and participants linked to The Nansen Legacy Project.
They will share their experiences and knowledge from research cruises in the Barents Sea.
The research vessel F/F «Kronprins Haakon» gives unique opportunities to explore the rapidly changing climate and ecosystems in the Arctic.
To ensure a sustainable management of the Northern Barents Sea and the adjacent Arctic Basin throughout the 21st century a new knowledge base is required.

(Top picture: Christian Morel / / The Nansen Legacy)
Read more blog posts from the Nansen Legacy Project Blog.

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