Abstract
In the archives of the State Institute of Fisheries Research a handwritten report of A. van der Werff on the wasting disease ofZostera marina L. in the Waddensea in 1932 and 1933 is kept. It contains an eye-witness account of the decline of the eelgrass beds. In 1932 the first attack of the disease took place in May and caused heavy devastation. Regeneration started soon, but a second attack at the end of August seemed to destroy the beds definitively. The next year was a year of struggle for the few poorly developed surviving plants. In 1938 the last surviving specimens were seen in the sublittoral.
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