The proportion of limpets in each 10-mm size class over 15 mm in length was
calculated for all exposed shore plots, and mean values determined. In each sheltered
shore patch, these mean values were used to determine the number of limpets in each
size class needed. Those sheltered shore patches where the size distribution did not
allow manipulation to the correct size frequency were rejected, and a new patch
selected. Limpets were removed from patches to obtain the correct size distribution and