Abstract
Estimates of population size and biomass of net plankton were made in two tropical fish ponds in relation to the ecological data over a period of one year. There was a wide spatial and seasonal variation of population size and biomass of net plankton in two ponds studied. Always predominant over zooplankton, phytoplankton demonstrated three distinct annual peaks in the pond N-1 while a single peak was obtained in the pond N-2. A variable result was found in two ponds in the values of Shannon index of general diversity for phyto- and zooplankton. The seasonal changes of phytoplankton number in these ponds showed an inverse characteristic either with absolute concentration or with the rate of concentration changes of bicarbonate in the water, while the former and concentration of dissolved oxygen was positively correlated. In the multiple correlation analysis, the greatest importance of the concentration of PO4 was indicated on the phytoplankton population as HCO −3 and dissolved oxygen were not considered to be included in the final regression formula in both the ponds studied but the rate of changes of HCO −3 , PO4 and dissolved oxygen were influential on phytoplankton in the pond N-1.
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Jana, B.B., De, U.K. & Das, R.N. Environmental factors affecting the seasonal changes of net plankton in two tropical fish ponds in India. Schweiz. Z. Hydrologie 42, 225–246 (1980). https://doi.org/10.1007/BF02502435
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DOI: https://doi.org/10.1007/BF02502435