SUMMARY: Respiration in well-fed and starved was measured by means of Cartesian diver microrespirometry at 5°C intervals between 10°C and 30°C. At 10°C encystment occurred. The optimum temperature for respiration was 25°C where a rate of 41·3 x 10 μl h per individual was recorded in well-fed animals. Mean cell size also reached a maximum at 25°C in well-fed individuals. Both respiration rate and mean cell size decreased with starvation, as did the rate of metabolism. A table of daily respiratory energy losses in well-fed and starved Podophrya is presented. The results and their implications are discussed in relation to other protozoa.


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