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Morphological structure and functional patterns of Keratella cochlearis (Gosse) populations in stratified lakes

  • Galina A. Galkovskaya
  • Inessa F. Mityanina
Part of the Developments in Hydrobiology book series (DIHY, volume 52)

Abstract

Vertical distribution of the rotifer Keratella cochlearis in stratified water columns of mesotrophic and eutrophic lakes during summer stagnation has been studied. Coexisting morphs K. cochlearis hispida (Lauterborn, 1898), K. c. tecta (Gosse, 1851) and K. c. cochlearis (Gosse, 1851) inhabit different layers in the water column and are vertically subdivided. The distribution of morph abundance and reproductive potential indicate that substitution of morphs within the vertical water column may be due to trophic conditions. The maximum population productivity is observed at the epi-metalimnion border. The maximum density zone lies below the zone of the highest productivity. The principle of ‘sliced functioning’ is used to explain the adaptive significance of the morphological structure of populations under heterogeneous environmental conditions.

Key words

Keratella cochlearis diurnal vertical distribution morphological structure population and energetic patterns 

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • Galina A. Galkovskaya
    • 1
  • Inessa F. Mityanina
    • 1
  1. 1.Institute of ZoologyByelorussian Academy of SciencesMinskUSSR

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