Poot et al. 2010 writes about this site (see p. 71): "The Mainland Coast is confirmed to hold internationally important numbers of several species. Especially the occurrence in winter of more than 20,000 Great Crested Grebes, a number exceeding the threshold of 1% of the global population, means that this coastal area is a more than serious MPA candidate. Also other values occur in this area like large numbers of Red-throated Divers in winter, large numbers of tern and gull species during spring and autumn migration, and in summer (breeding birds). Only a fraction of the Mainland Coast has been proposed as extension of the already designated SPA Wadden Coast, but does not hold the high density areas for Great Crested Grebes."
BirdLife International (2022) Important Bird Areas factsheet: Mainland Coast. Downloaded from http://www.birdlife.org on 07/07/2022.