Effect of food conditions on the bacterial feeding of Daphnia galeata

Jotaro Urabe, Yasunori Watanabe

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Feeding selectivities of Daphnia galeata were measured using various density combinations of 14C-labeled Chlamydomonas and 3H-labeled natural bacteria. In all food combinations, D. galeata preferred algae. Selectivity coefficient (bacterial clearance rate: algal clearance rate) was 0.35 at the level of incipient food limitation (1.5 × 106 μm3 ml-1).However, it increased up to 0.9 with increasing total food concentration. A simple mechanical sieving model alone cannot explain such a change in the selectivity coefficient. A mechanism of 'clogging' suggestively explain the increase of bacterial ingestion efficiency by D. galeata, especially at high food concentrations. The change of selectivity coefficient related to food condition suggests that bacterial feeding by the Daphnia is incidental event associated with the algal feeding.

Original languageEnglish
Pages (from-to)121-128
Number of pages8
Issue number1
Publication statusPublished - 1991 Nov 1
Externally publishedYes


  • Chlamydomonas
  • Daphnia galeata
  • adaptation
  • bacteria
  • clearance rate
  • feeding mechanism
  • ingestion efficiency
  • zooplankton

ASJC Scopus subject areas

  • Aquatic Science


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