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On the Relationship between Temperature and Rate of Development of Insects at Constant Temperatures
Journal of Animal Ecology
Vol. 13, No. 1 (May, 1944), pp. 26-38
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/1326
Page Count: 13
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1. The following equation has been used to show the relationship between temperature and the time required for development in insects and other poikilothermic animals: [Note: equation omitted. See the Image of page 37 for this equation]. 1/y represents the reciprocal value of the time required for a given stage in the life cycle of an insect, to develop at a given temperature x; K, a and b are constants. The calculated values for 1/y, when plotted against appropriate values for temperature (x) describe an S-shaped velocity curve. The equation is a form of the logistic curve in which the value for K represents the upper asymptote of the curve. 2. The methods used in calculating the curve are described in detail from data relating the development of the egg and pupal stage of Drosophila melanogaster at constant temperatures. The data are taken from papers by Ludwig & Cable (1933), and Powsner (1935). 3. Data on the rate of embryonic development in four species of Diptera, given by Melvin (1934), and for Ephestia kühniella, given by Voŭte (1936), have been fitted to this form of curve. The curve faithfully represents the trend of the speed of development of insects, for 85-90% of the complete range of temperature at which development can go on. The `peak' temperature is defined as the temperature at which the given stage of the animal develops at the fastest average rate. At temperatures above the `peak', the observed values for rate of development are significantly less than the calculated values: the range of these temperatures represents 10-15% of the total range of temperature at which development can go on.
Journal of Animal Ecology © 1944 British Ecological Society