Rotifera IX pp 123-127 | Cite as

The effect of bacteria on interspecific relationships between the euryhaline rotifer Brachionus rotundiformis and the harpacticoid copepod Tigriopus japonicus

  • Min-Min Jung
  • Atsushi Hagiwara
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 153)


Inconsistent results have been obtained on the population growth of Brachionus rotundiformis and Tigriopus japonicus, when results from single-species and two-species mixed cultures are compared. Bacteria growth was not regulated in these experiments, which could be the cause for this. In order to test this possibility, we conducted similar experiments under axenic and synxenic (with presence of one species of bacteria) conditions. The population growth of B. rotundiformis was suppressed by the presence of T. japonicus in axenic cultures. T. japonicus could not persist in axenic cultures, but its population increased when grown in synxenic cultures. T. japonicus used RT bacteria strain as a food source, while these bacteria were toxic to B. rotundiformis. These results suggest that bacteria can modify the interspecific relationship between B. rotundiformis and T. japonicus.

Key words

axenic culture Brachionus rotundiformis copepod co-existing bacteria interspecific relation rotifer synxenic culture Tigriopus japonicus 


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Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • Min-Min Jung
    • 1
  • Atsushi Hagiwara
    • 2
  1. 1.South Sea Fisheries Research Institute (SSFRI)National Fisheries Research and Development Institute (NFRDI)Yosu-si Chullanam-doKorea
  2. 2.Faculty of FisheriesNagasaki UniversityBunkyo, NagasakiJapan

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