, Volume 169, Issue 2, pp 251–257 | Cite as

Analysis of factors controlling responses of an aquatic microcosm to organic loading

  • Shuichi Shikano
  • Yasushi Kurihara


The changes in the numbers of individuals of the constituent species and ammonia concentrations in 6 subsystems (Bacteria, bacteria-Cyclidium, bacteria-Aeolosoma, bacteria-Chlorella, bacteria-Cyclidium-Chlorella, bacteria-Aeolosoma-Chlorella) of an aquatic microcosm were examined after the addition of organic substance (peptone) at both the young and mature stages of succession. Organic loading led to decreases in the numbers of bacteria and Aeolosoma after temporary increases in their numbers and an oscillation in the numbers of Cyclidium but the densities of these populations were maintained at constant values in the presence of Chlorella. When organic substance was added at a young stage where the photosynthetic activities of algae were high, invertebrates, especially Aeolosoma, were damaged by unionized ammonia which was formed as the pH value increased. In contrast, organic loading at the mature stage enhanced the population densities and biomasses of all constituent species.

Key words

Aeolosoma aquatic microcosm Chlorella Cyclidium organic loading 


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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • Shuichi Shikano
    • 1
  • Yasushi Kurihara
    • 1
  1. 1.Biological Institute, Faculty of ScienceTohoku UniversitySendaiJapan

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