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Empirical evidence for a complex diurnal movement in Hexarthra bulgarica from an oligotrophic high mountain lake (La Caldera, Spain)

  • P. Carillo
  • L. Cruz-Pizarro
  • R. Morales-Baquero
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 52)

Abstract

A detailed 24 hour sampling program has been carried out at 26 depths of 6 stations located along the two main transects of lake La Caldera. The resultant data has allowed us to define for H. bulgarica a general daily trend of movement which couples a typical nocturnal vertical migration with an ‘horizontal’ one that is particularly conspicuous at dawn and dusk when the population seemed to moved toward or away from the shore, respectively.

These results confirm our previous data and suggest that light is responsible for these complex movements.

Key words

Hexarthra bulgarica diurnal vertical movement horizontal distribution 

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References

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • P. Carillo
    • 1
  • L. Cruz-Pizarro
    • 1
  • R. Morales-Baquero
    • 1
  1. 1.Dpto. Biología Animal Ecología y Genética. Fac. CienciasUniversidad de GranadaGranadaSpain

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