The ancient maerl beds of the Fal and Helford Estuaries in Cornwall have long been known about and were designated within a Marine Protected Area in 2005, however, far less is known about the maerl that exists outside the estuaries in the bays along Cornwall’s south coast.

New sites discovered

In July, Natural England set out on an expedition to find out more exploring the areas just off the Roseland Peninsula and St Austell Bay. Using an underwater drone and divers they identified previously unknown areas of maerl and during the survey work recorded 110 different seaweed species and 79 different types of animals living on the maerl. Small samples were collected for genetic work by the University of Exeter, which will help with understanding the genetic uniqueness of maerl beds in this area.

Diving survey of maerl beds Becky Tooby, Natural England

The new information about maerl sites will be used to help target mapping efforts this autumn, adding to understanding of where maerl can be found.

The project was funded by Defra’s Marine Natural Capital and Ecosystem Assessment programme, which is leading the way in integrating natural capital and ecosystem assessment approaches into Government decision making.

Natural England’s Marine Senior Officer, Angela Gall, who led the survey said:

It’s incredible to think, that in Britain, within sight of the shore, there are still completely undiscovered sites. We will use this new evidence on the maerl bed sites to seek better protection for these ‘ancient woodlands of the sea.

Over three years, the programme is gathering evidence and developing tools and frameworks to enable us to better manage our marine natural environment, and the services it provides for people – before it is too late.

Click here to read the full Natural England press release