IMIS

Sampling in the intertidal was done during both low and high tider. Low tide sampling followed the procedure of the Balgzand sampling: cores were taken up to 30 cm depth and sieved in the field over a 1 mm sieve. High tide sampling was done with a specially designed flushing sampler (Van Arkel & Mulder, 1975; Neth. J. Sea Res. 9, 365-370.; Mulder & Van Arkel, 1980; Neth. J. Sea Res. 14, 119-122.). Sampling of subtidal and gully was done from a research vessel with a standard Van Veen grab-sampler. The first inventory took place in 1974-1975 and it was repeated in 1978 and 1979. Information has been published in Van Arkel & Mulder (1979, 1982), Anon (1983) and Baretta & Ruardy (1988). Recently, intertidal benthos during the period 1974-1979 was compared with the present situation by Compton et al. (2017; J. Sea Res. 126).