, Volume 38, Issue 2, pp 213–223 | Cite as

An ecological study of three freshwater ponds of Hyderabad-India. I. The environment

  • V. S. Rao


The data on which the paper is based were collected over a period of two years to study the ecology of algae in three freshwater ponds lying in the vicinity of Hyderabad — India. For the present it discusses only the temperature lags and ionic composition of the waters studied and brings forth the following:
  1. 1.

    It is not the size of the body of water alone that controls the temperature lag in time and amplitude but the salinity of water and the density of its phytoplankton also alter the thermal behaviours.

  2. 2.

    Ionic diagrams on the pattern proposed by Maucha, have been drawn.

  3. 3.

    The ionic proportions of the waters studied differed considerably from those proposed for lakes in general by Rodhe (1949). Ionic composition of two of the ponds was Na > Ca > Mg > K; HCO3 > Cl > S04, but it was Ca > Na > Mg > K; HCO3 > C1 > S04, for the third.

  4. 4.

    The ionic composition of the same body of water also differed from season to season and it was felt that the seasonal fluctuations which have secondary importance in lakes, become more significant in small freshwater bodies. Therefore, it is stressed that the ionic composition assessed from a limited number of observations may lead to wrong conclusions.



India Phytoplankton HCO3 Thermal Behaviour Ecological Study 
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Copyright information

© Dr. W. Junk n.v. Publishers 1971

Authors and Affiliations

  • V. S. Rao
    • 1
  1. 1.Hydrobiology Laboratory, Department of BotanyOsmania UniversityHyderabad-7India

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