Scallop on UK seabed

Scientists call for more research on how human activities affect the seabed

Tom Vance / PML 

A group of UK scientists have published extensive research into how industry and environmental change are affecting our seafloors, but say more work is needed to help safeguard these complex ecosystems and the benefits they provide to people for the future.

Researchers from eight institutions and organisations have worked together to examine areas of sea or ocean located on the UK continental shelf to understand the sensitivity of these systems to human activities. The societal importance of these ecosystems extends beyond food production to include biodiversity, carbon cycling and storage, waste disposal, nutrient cycling, recreation and renewable energy.

Martin Solan, lead principal investigator and Professor in Marine Ecology at the University of Southampton, comments: “Our seafloors are teeming with life, from microscopic organisms, to larger creatures such as fish and crabs. All interact as part of a complex system which plays a vital role in maintaining the health of the seabed and the rest of food web”.

“Human intervention, such as fishing, pollution and activities causing climate change are all affecting these finely balanced ecosystems.  Collectively, our research provides us with a new perspective on how the seafloor is being modified, for better or for worse, but more research is now needed to understand the longer-term consequences of such change for the wider environment and for society at large”.

The research team has analysed the biodiversity, nutrient, metal and carbon cycling in areas of the seafloor around the UK subject to different environmental conditions and human use. Scientists at the Plymouth Marine Laboratory (PML) investigated how Nitrogen changes across the seafloor of the Celtic Sea. The researchers found that a combination of seasonality, plankton productivity in the water column, and sediment type (e.g., mud, sand, sandy mud etc…) influences how Nitrogen is cycled across the seafloor. Across this study, the PML scientists showed that 6-9% of the Nitrogen is being lost from this system annually. Importantly, this level of “Nitrogen loss” needs to be replaced to maintain a healthy system.
 
Dr Phil Williamson, from the University of East Anglia, who helped coordinate this research programme, commented: "Much of what happens in the sea is out of sight and out of mind.  This study has provided a wealth of insights into the natural recycling processes that are literally at the base of marine ecosystems, underpinning the many benefits that we obtain from the sea".

The variety of projects which the Biogeochemistry special issue brings together, were conducted on three dedicated research cruises and other expeditions around the UK.  The research is part of a special issue of the scientific journal Biogeochemistry and includes contributions from the University of Southampton, the Centre for Environment, Fisheries and Aquaculture Science (CEFAS), the National Oceanography Centre (NOC), University of Portsmouth, University of Oxford, Bangor University, Plymouth Marine Laboratory and The Scottish Association for Marine Science (SAMS).

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