A flow meter was employed at Cashel and Letterard to measure
water velocity at the surface, 20 cm and 40 cmwater depth. For the
tide pool, flushing time estimates were calculated by measuring the
temperature (YSI 556 handheld temperature probe) inside the pool
and the open sea before the tide came in and the time it took for the
temperature in the pool to equilibrate with fresh seawater. Salinity
was measured at all sites from April 2007 to September 2008, using
an YSI 556 handheld conductivity probe, and is expressed in
Practical Salinity Scale.