Introduction During the years 1966--1971 net samples from surface water in the Helgoland area (54° 11'N, 7°54'E) were collected continuously every workday and investigated for various purposes. Besides life history studies on selected phytoplankton species more than 170 species were documented in the living stage by original photos and compiled for an introductory account in marine phytoplankton (Drebes 1974). In the following years (1972-1974) net samples from the List area (55°Ol'N, 8°27'E) have been examined two times a week. From both stations all species observed were regularly listed, with additional remarks on their frequency. Thus, the checklist presented here informs also about seasonal occurrence and frequency of the species, which might be of interest for ecologists äs well äs for taxonomists. Sampling was carried out with nets of different mesh size: 20 , 28 /im, 75 jum. The samples reached immediately the laboratory nearby, and the plankton organisms were still alive when they came to observation. Identification of the species occurred routinely in small Petri dishes under a dissection microscope. About 200 species could be recognized by this simple method. Naturally, in uncertain cases water mounts or other special preparations had to be made for observation with microscopes
Botanica Marina – de Gruyter
Published: Jan 1, 1976
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