Rough periwinkles
eating on the rocks

Because rough periwinkles are effective grazers and often found in large quantities, they can greatly affect the beach environment. The periwinkles gather in crevices, presumably for protection against dehydration and the waves that can wash them away. Here are also some common periwinkles.
These grazing areas can be called ”The slippery black belt”.

Rough periwinkle     Other names

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© Aquascope 2000   Tjärnö Marine Biological Laboratory, Strömstad, Sweden
Bo Johannesson | Martin Larsvik | Lars-Ove Loo | Helena Samuelsson