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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 8 | PAGES 1081-1109 | 1997
© Oxford University Press

research-article

Pelagic flagellate populations in the southern North Sea, 1988–89. I. Qualitative observations

G. Novarino, D.K. Mills1,3 and F. Hannah2

Department of Zoology, Natural History Museum Cromwell Road, London SW7 5BD, UK 1University of Wales (Bangor), School of Ocean Sciences Menai Bridge, Gwynedd LL59 5EY, UK 2University Marine Biological Station Millport, Isle of Cumbrae KA28 0EG, UK 3Present address: CEFAS, Lowesroft Laboratory Lowestoft, Suffolk NR33 OHT, UK

Received on October 15, 1996; accepted on April 14, 1997 During the UK Natural Environment Research Council (NERC) North Sea Community Programme 1987–1992, pelagic flagellate populations in the southern North Sea were examined during the period 1988–89. Not less than 84 species of flagellates were found, of which 73 could be identified down to genus or species level using light or scanning electron microscopy: 52 dinoflagel lates, six cryptomonads, five green flagellates, four prymnesiomonads, two chrysomonads, one euglenid, one silicoflagellate, one bodonid and one flagellate incertae sedis. In addition, there were not less than six unidentified species of flagellates incertae sedis, two small (<15 µm) unidentified naked dinoflagellates, one unidentified cryptomonad, one unidentified coccolithophorid, and unspecified numbers of unidentified species of choanoflagellates. There were 44 phototrophs (of which eight were mixotrophic or possibly so), 35 heterotrophs, and five flagellates whose mode of nutrition is unknown. A total of 12 flagellates were found in all of the areas investigated, while another nine were found in one area only. Areas 9 (German coastal water near Helgoland) and 1 (Anglian coastal mixed water) were the most and least species rich, respectively. Observations on size-diversity relationships suggested that the highest diversity of flagellates occurred close to the lower limits of the size ranges. Some interesting or rarely reported flagellates are described.


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