, Volume 203, Issue 1–2, pp 111–119 | Cite as

The hypolimnetic protozoan plankton of a eutrophic lake

  • Johanna Laybourn-Parry
  • Judith Olver
  • Sian Rees


The seasonal distribution of benthic species in the water column above and below the thermocline in a small eutrophic lake is described. During summer stratification populations of Spirostomum spp, Loxodes spp., Plagiopyla and Deltopylum become established in the plankton on or below the oxycline/thermocline. At shallow sites no migration occurred and populations of the migratory species in the benthos were sparse, with the exception of Plagiopyla which occurred in high densities in the sediment. Two distinct planktonic populations are established during stratification: an epilimnetic community of obligate planktonic ciliates and a hypolimnetic community of benthic migrants.

Key words

ciliate protozooplankton oxygen epilimnion hypolimnion benthos migration 


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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Johanna Laybourn-Parry
    • 1
  • Judith Olver
    • 1
  • Sian Rees
    • 1
  1. 1.Institute of Environmental and Biological Sciences, Division of Biological SciencesUniversity of LancasterLancasterUK

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