, Volume 213, Issue 2, pp 141–148 | Cite as

Substrate selection and seasonal variation in densities of invertebrates in stream pools of a tropical river

  • M. Arunachalam
  • K. C. Madhusoodanan Nair
  • J. Vijverberg
  • K. Kortmulder
  • H. Suriyanarayanan


Spatial distribution and seasonal variation in densities of the invertebrates were investigated for a year in three stream pools of a South Indian river. The effects of season, substrate type and water depth on the distribution were analyzed. Substrate type and season influenced the invertebrate distribution the most. Leaf packs harboured most of the organisms followed by macro-algal substrate and sand. The lowest densities were observed on rocky substrates and in the water column. Rocky substrates in shallow water supported higher densities of total invertebrates than deeper areas. Chironomid larvae dominated all benthic substrates throughout the year. Of the 19 invertebrate taxa studied, 6 showed no seasonality in densities, and most of the rest showed their highest densities in the pre-monsoon period and lowest in the SW monsoon or post-monsoon periods. However, in two of the three pools, the densities of total invertebrates were highest during the post-monsoon period with secondary peaks in the pre-monsoon period.

Key words

microdistribution seasonality invertebrate densities substrate selection stream pools tropical river 


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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • M. Arunachalam
    • 1
  • K. C. Madhusoodanan Nair
    • 1
  • J. Vijverberg
    • 2
  • K. Kortmulder
    • 3
  • H. Suriyanarayanan
    • 1
  1. 1.Department of Aquatic Biology & FisheriesUniversity of KeralaTrivandrumIndia
  2. 2.Limnological InstituteTjeukemeer LaboratoryVD OosterzeeThe Netherlands
  3. 3.Zoological LaboratoryUniversity of LeidenRA LeidenThe Netherlands

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