Abstract
The Menai Strait is a narrow channel subject to strong tidal currents but little wave action. The major physical factors which interact to control the nature and distribution of the fauna and flora are turbidity, scouring, current strength and substratum. A simple device, based upon a spring balance, was used to measure maximum current strength near the bottom. The distribution of the fauna was studied by a transect survey across the Channel and compared with a similar survey in the same place 20 years earlier. The results suggest a high biological stability although some population fluctuations do take place. It is suggested that such general surveys be supplemented by more detailed investigations of individual species.
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