THE EFFECT OF SEX AND AGE ON THE TEMPERATURE AT WHICH REVERSAL IN REACTION TO LIGHT IN ERISTALIS TENAX OCCURS

Publisher Website
Google Scholar
Abstract
Over 1.620 observations were made on over 1,000 drone flies in ascertaining the temp. at which E. tenax becomes negative to light. In a luminous intensity of 700 foot candles Eristalis is highly photopositive within a temp. range between approx. 10[degree] and 30 [degree]C. Outside these limits it is highly negative. Reversal of the photopositive reaction can be produced either by increase or decrease of the temperature. In high temps. the temp. at which Eristalis changes in its reaction to light depends on the sex of the flies. Females cease their positive reaction to light and become negative at a higher temp. than do [male][male] - In high temps., the temp. at which Eristalis changes in its reaction to light depends also on the age of the flies. The younger the fly, the higher the temp. at which it ceases its positive reaction to light and becomes negative.
Keywords

This publication has 1 reference indexed in Scilit: