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Hydrobiologia

, Volume 463, Issue 1–3, pp 133–140 | Cite as

Selective feeding by the aquatic oligochaete Tubifex tubifex (Tubificidae, Clitellata)

  • Pilar Rodriguez
  • Maite Martinez-Madrid
  • Jesús Angel Arrate
  • Enrique Navarro
Article

Abstract

The particle size distribution of faecal pellets produced by the tubificid worm Tubifex tubifex in laboratory culture, was measured with a Coulter® Multisizer. The faecal material from worms cultured in a range of sediments was composed of particles with a mean diameter of less than 63 μm, and only a few isolated larger particles were found by microscopic analysis. This suggests that this species actively selects the silt-clay fraction, avoiding larger sand particles. A more detailed analysis of faeces revealed that about 75%, by volume, was composed of particles with a mean diameter < 25μm, and the mode was < 10μm. T. tubifex fed selectively on the organic rich particles of the sediment, and this feeding was independent of particle size. Measurement of the organic content of faeces (measured as % loss on ignition) showed that they had a consistently higher organic content than the sediment, considered as whole sediments or the <63 μm sieved fraction. On the basis of these results, we hypothesise that this species exhibits two levels of selectivity in its feeding behaviour. Thus selection is primarily based on particle size, avoiding the ingestion of sand particles and also, on the preferential selection of particles associated with organic material, within the fine (silt-clay) fraction of the sediment.

Feeding biology feeding selection tubificids Tubifex faeces 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Pilar Rodriguez
    • 1
  • Maite Martinez-Madrid
    • 1
  • Jesús Angel Arrate
    • 1
  • Enrique Navarro
    • 1
  1. 1.Departamento de Biología Animal y Genética, Facultad de CienciasUniversidad del País VascoBilbaoSpain

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