Subtidal mixed sediments

Undersea beds of a mixture of stones, gravels, sands and muds

Undersea beds of a mixture of stones, gravels, sands and muds © Lin Baldock

 

As the name suggests, mixed seabeds can have a range of different types of sediment from muddy, gravely sands to mosaics of cobbles and pebbles in or on a sand, gravel or mud seabed. Mixed areas also include seabeds where waves or ribbons of sand form on the surface of a gravel bed.

Because mixed seabeds are so varied, they may support a wide range of animals, both on and in the sediment.  Animals found here include worms, bivalves (with their paired, hinged shells), starfish and urchins, anemones, sea firs and sea mats.

For the official habitat definition please see the documents listed below.

 

European distribution

This broad habitat is widespread around the British Isles and in Europe.

Undersea beds of a mixture of stones, gravels, sands and muds fact

 

Official habitat definition

EUNIS habitat A5.4 Sublittoral mixed sediments

 

Further information

JNCC Marine Habitat Classification - Sublittoral Mixed Sediment

JNCC Marine Habitat Classification - Infralittoral Mixed Sediment

JNCC Marine Habitat Classification - Circalittoral Mixed Sediment

JNCC Marine Habitat Classification - Offshore Circalittoral Mixed Sediment

JNCC EUNIS habitat correlations table