Two surveys of the sediments and macro-invertebrates of intertidal areas of the Wash were undertaken during late September to early November 1998 and 1999. In 1998, 113 sites, each 1 ha in area were sampled, 91 of which were sampled in Institute of Terrestrial Ecology's survey of 1986. In 1999, 103 sites were sampled, 82 of which had been first sampled in 1986.
