World-first uses satellites and ocean models to explain Antarctic seafloor biodiversity

December 11, 2017, University of Tasmania
An under-ice seafloor community in O'Brien Bay showing a diverse community of marine invertebrates, includingrounded sea-squirts (ascidians), feathery polychaete worms (also visible in the background) and a bright orangespiky sponge. Credit: Jonny Stark/Australian Antarctic Division

In a world-first, a research team of Australian and international scientists has used data collected by satellites and an ocean model to explain and predict biodiversity on the Antarctic seafloor.

The researchers combined satellite images of phytoplankton colour on the sea surface with a suite of connected models of how the microscopic phytoplankton are swept by currents, sink to the seafloor and are then redistributed across it, to accurately predict the extent of seafloor life without the need for extensive physical sampling.

The study's lead author, IMAS PhD student Jan Jansen, said the breakthrough, published in the prestigious journal Nature Ecology & Evolution, would support better conservation and management of in the Antarctic.

"For the first time, we are able to predict how much food is available to organisms on the Antarctic sea floor, and therefore how much life is supported across the region," Mr Jansen said.

"Scientists have long known that there was a relationship between organic matter on the surface and life on the sea floor.

"But until now there hasn't been a reliable model that not only explained the link but also enabled predictions of biodiversity.

"Our 'food availability model' brings satellite data and analysis of the rate at which organic matter sinks together with data about fluctuating on and above the seafloor.

An under-ice seafloor community in O’Brien Bay showing a diverse community of marine invertebrates, including rounded sea-squirts (ascidians), feathery polychaete worms (also visible in the background) and a bright orange spiky sponge© Jonny Stark/Australian Antarctic Division
"The 's predictions about how much food there will be in a particular area have been verified by physical sampling of .

"This system of models allows broad scale predictions of seafloor biodiversity over vast regions of the Antarctic continental shelf that were previously hidden, as well as predictions about how climate change will affect the ecosystem.

"It will also support better informed decisions about how parts of the ocean can be best managed and conserved in the future," Mr Jansen said.

Co-author IMAS Professor Craig Johnson said that while the study was based on a region in eastern Antarctica, the new approach could be used to generate maps of biodiversity across the continental shelf right around the Antarctic continent, including areas where information is currently limited or difficult to collect.

"This information would be very valuable and is an exciting prospect," Professor Johnson said.

"Jan Jansen is to be congratulated for his lead role in pulling together many threads across several disciplines to help answer a major research question. It is a remarkable achievement by a scientist so early in his career

"With further research, this system of models has the potential to provide valuable insights into biodiversity across other parts of the world's oceans.

Professor Johnson said an extraordinarily diverse team of researchers were involved in this study, including earth scientists, physicists, geologists and biologists.

Explore further: More 'losers' than 'winners' predicted for Southern Ocean seafloor animals

More information: Abundance and richness of key Antarctic seafloor fauna correlates with modelled food availability, Nature Ecology & Evolution (2017). nature.com/articles/doi:10.1038/s41559-017-0392-3

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