Zonation of molluscs
Look for an area of rocks that will give you a transect from the low to high tide zone without significant interruptions, gaps or major changes of slope.
Stretch a tape measure from knee deep in the water to the upper limit of molluscs. Use a 0.5m quadrat and start knee deep in the sea. Carry out a belt transect focusing on the molluscs present. Record the distance (centre of quadrat) and the number/percentage of each mollusc present.
For those which encrust the rock, oysters, barnacles, limpets, etc record their % cover.
For those that have mobile individuals, periwinkles, whelks, top-shells etc, record number.
Plot your results as a series of kite diagrams.
Is there a pattern to the distribution of molluscs?
What factors influence the distribution?