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Laboratory observations on the vertical distribution of a tropical pelagic flatworm (Mesostoma sp.) in relation to satiation

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Abstract

Mesostoma sp., isolated from different lakes in Brazil, was taken to the laboratory and fed Moina sp. The vertical position of satiated and non-satiated individuals was monitored in 25 cm high columns exposed to natural sunlight. Phototactic responses were studied under standardised experimental conditions.

Satiated individuals resided nearer to the bottom than non-satiated Mesostoma. Non-satiated individuals showed an irregular vertical distribution due to swimming behaviour, whereas satiated animals remained stationary.

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Authors and Affiliations

  1. Laboratory of Animal Ecology, State University of Ghent, K.L. Ledeganckstraat 35, 9000, Gent, Belgium

    Luc De Meester & Henri J. Dumont

Authors
  1. Luc De Meester
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  2. Henri J. Dumont
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De Meester, L., Dumont, H.J. Laboratory observations on the vertical distribution of a tropical pelagic flatworm (Mesostoma sp.) in relation to satiation. Hydrobiologia 198, 103–106 (1990). https://doi.org/10.1007/BF00048626

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  • DOI: https://doi.org/10.1007/BF00048626

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