Abstract
It is shown, that wave action stimulates Macoma balthica, Spisula subtruncata, Cardium edule and Mya arenaria to start burrowing and to continue the burrowing for a longer period of time than in stilI water. All 4 species live in places, where they are in danger of being washed out of their substratum. On the contrary, wave action slightly inhibits burrowing activity in Nuculana pernula, and it clearly inhibits burrowing activity in Nucula nucleus. These two species live in places, where there is little risk that they will be washed out of their substratum. N.pernula was the only of the species tested, which showed any signs of “tiredness”.

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