Aquatic Ecology

, Volume 40, Issue 1, pp 23–32 | Cite as

Statistical quantification of the effect of thermal stratification on patterns of dispersion in a freshwater zooplankton community

  • Stephen J. Thackeray
  • D. Glen George
  • Roger I. Jones
  • Ian J. Winfield
Article

Abstract

The vertical distribution of crustacean zooplankton species was examined during 2000 in Windermere, Cumbria. Patterns of dispersion were evaluated quantitatively using two different approaches. Firstly, Morisita’s index was used to test whether patterns of dispersion differed significantly from a state of randomness and, secondly, the relative distribution of zooplankton individuals between the epilimnion and hypolimnion was investigated, for a series of standardised vertical profiles of organism density. All six of the dominant species of planktonic crustaceans showed aggregated patterns of dispersion throughout the year. For most species, patterns of dispersion were affected by the onset and breakdown of thermal stratification in the lake. The degree of aggregation in the vertical plane, measured using Morisita’s index, increased when the lake became thermally stratified. Furthermore, for most species, there was a positive association between the degree of vertical differentiation in abundance across the thermocline, and the degree of temperature differentiation in the stratified water column. The results of the present analysis provide quantitative evidence for the phenomenon known as ‘zooplankton stratification’ and for temporal variation in patterns of zooplankton dispersion.

Key words

Morisita’s index Plankton Spatial heterogeneity Zooplankton stratification 

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Notes

Acknowledgements

We thank S. C. Maberly and an anonymous reviewer for providing useful comments on the manuscript and J. B. James and J. M. Fletcher for assistance in collecting the field data. The work was funded under a studentship awarded to S. J. Thackeray by the Freshwater Biological Association.

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Stephen J. Thackeray
    • 1
  • D. Glen George
    • 1
  • Roger I. Jones
    • 2
  • Ian J. Winfield
    • 1
  1. 1.Centre for Ecology and HydrologyLancaster Environment CentreBailrigg, LancasterUK
  2. 2.Department of Biological and Environmental ScienceUniversity of JyväskyläJyväskylän YliopistoFinland

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