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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 3463

Umezawa Shun-ichi; [The Local Difference of Desiccation Resistance of the Rotifer, Philodina roseola]. Research Reports of The Kochi University 1(28):1-3, 1952

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Desiccation resistance of the rotifer, Philodina roseola, inhabiting in Kochi, was studied under a definite drying condition (temperature 25-27 degrees C, relative humidity 68-70%). A single rotifer on a slide glass was subjected to desiccation for various periods and its strength of desiccation resistance was indicated by the length of time to kill the rotifer. Comparing with the results which have been obtained on the same species in Sapporo under the same drying conditions in 1947, the rotifer in Kochi is more resistant to desiccation, and even after having been kept dry for about 37 hours, several individuals could survive without injury. On the contrary no rotifer in Sapporo were alive after drying for about 90 seconds. It seems apparent, from this fact, that rotifer adapted to warm climate is more resistant to desiccation than those to cold climate.