Hydrobiological Bulletin

, Volume 24, Issue 2, pp 111–118 | Cite as

Historical phytoplankton data of the Marsdiep

  • Gerhard C. Cadée
  • Jan Hegeman


Published and unpublished data on phytoplankton of the Marsdiep tidal inlet were studied. Most older data, going back to 1897, are based on net-phytoplankton only, the earliest quantitative (Utermöhl) data being from 1965.Phaeocystis sp. bloomed in the Marsdiep after a spring diatom peak, at least as long ago as 1897. Summer or automn peaks ofPhaeocystis sp., frequent now, were also observed in 1898 and 1899. The duration of thePhaeocystis blooms in 1897 to 1899 was shorter than observed after 1978, but longer than in the early 1970s. The recent (1987 to 1989) duration ofPhaeocystis blooms is 2 to 3 times that of 1897–1899. This increase surpasses normal yearly variation and can be related to anthropogenically caused in crease in nutrient concentrations. A number of diatomspecies, at present numerically dominant in the spring peak, are not mentioned as dominant in the earlier periods of observation. They are small and passed through the nets used.Biddulphia sinensis, at present often abundant, is an immigrant in the North Sea since 1903, and for that reason absent from the earliest Marsdiep observations. No clear trend in duration of diatom blooms is apparent during 1965 to 1989. Anthropogenic eutrophication did not affect diatom blooms. Marsdiep records in the literature ofPhaeocystis globosa, P. pouchetii andP. sp. all refer to the same species.


Phytoplankton trends Marsdiep Wadden Sea Phaeocystis 


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Copyright information

© Netherlands Hydrobiological Society 1991

Authors and Affiliations

  • Gerhard C. Cadée
    • 1
  • Jan Hegeman
    • 1
  1. 1.Netherlands Institute for Sea ResearchTexel, NL

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