Author(s): Nasrullah Ahad and RJ Rao

Abstract: Cyclomorphosis is a change that occurs seasonally in the dimensions of certain appendages or of the body size in the clone line of a parthogenetically reproducing organism. In the present work cyclomorphosis was examined in species of Brachionus caudatus. The zooplankton samples were collected from Tighra Reservoir Gwalior by filtering 50 litres of reservoir water through a plankton collecting net made of bolting nylon cloth. Sampling was done from May 2012 to October 2012 in the last week of every month. The total length observed in the month of May was 0.210mm which decreased to 0.157mm in October. Similarly, the length of lorica was decreased from 0.150 mm to 0.120mm and the width of lorica decreased from 0.135 to 0.105 mm. In this species the cyclomorphosis was greatly controlled by the change in physico-chemical parameters of water particularly due to seasonal change in temperature.

Pages: 430-433  |  1818 Views  199 Downloads

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