POIKIL OTHER MIC ADAPTATIONS 



PROSSER; No, I do not think it conflicts. All I am saying is 

 that I think that Fisher's data* suggests that there are central 

 nervous components which are involved in the swimming responses 

 in addition to the metabolic ones. The difference between our 

 curves and your data** is that your activity curves rise to a peak 

 and then drop off rather gradually. The ones which Dr. Root has 

 obtained come up to a peak as you saw, and drop off very steeply. 



HART: Yes, but the active metabolism may drop off very 

 rapidly, too. 



PROSSER; Yes, I think it does. In the data which I showed 

 you from Kanungo, the curves would come up to a maximum. The 

 shape is somewhat different from those of Fry . The metabolism 

 of these goldfish was measured at different temperatures. It was 

 not measured at the temperature of acclimation only as it was in 

 Fry's data. 



HANNON; In the data that you have just presented, I have seen 

 a number of instances where the effects of temperature on poikilo- 

 therms and homeotherms are quite similar. For example, in many 

 poikilotherms acclimatization to cold is accompanied by an increased 

 metabolic rate. We see this same effect in small mammals such 

 as the rat. 



PROSSER: For a different reason, though. 



*Fisher, K. C. 1959. Adaptation to temperature in fish and small mammals. 

 Physiological Adaptation, pp 3-49. Ed. C. L. Prosser. Amer. Physiol. Soc., 

 Washington. 



**Fry, F. E. J, and J. S. Hart. 1949. Cruising speed of goldfish in relation to 

 temperature. Jour. Fish. Res. Bd. Canada, 7:169-175. 



AFry, F. E. J. and J. S. Hart. 1948. Relation of temperature to oxygen con- 

 sumption in goldfish. Biol. Bull. 94:66-77. 



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