Attachment and orientation ofMytilus EdulisL. in flowing water

Abstract

Abstract The effects of flow velocity and shell orientation in a flow field on byssus thread attachment were investigated in the blue mussel Mytilus edulis L. in a flume flow. The number of established byssus threads and the strength of byssus attachment were significantly affected by flow velocity. No effect on number of attached byssus threads was observed relative to orientation of the mussel, but mussel orientation at termination of the high flow experiments was significantly dominated by the position: ventral upcurrent. By measuring the number of established byssus threads and the strength of attachment of individual detached byssus threads the potential strength of attachment was estimated. In still water the measured strength of attachment constituted 21% of the estimated potential strength of attachment, but in a 19.4 cm sec-1 flow the measured strength of attachment constituted 81%. This observation indicates, that the correlation between the number of etablished byssus threads and the force of a...