. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TEMPERATURE AND DIAPAUSE 209 of any other temperature within the physiological range. The temperatures selected for study in this manner were 2y2, 10, 15, 20 and 30° C, the effects in each case being judged in terms of the time subsequently required for the initiation of adult development at 25° C. In order to facilitate comparisons with the results at 6° C., unchilled diapausing pupae of the same 1953-brood were utilized and all experiments were set up synchronously. The over-all results, including those previously de- scri
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TEMPERATURE AND DIAPAUSE 209 of any other temperature within the physiological range. The temperatures selected for study in this manner were 2y2, 10, 15, 20 and 30° C, the effects in each case being judged in terms of the time subsequently required for the initiation of adult development at 25° C. In order to facilitate comparisons with the results at 6° C., unchilled diapausing pupae of the same 1953-brood were utilized and all experiments were set up synchronously. The over-all results, including those previously de- scribed for 6° C., have been summarized in Table III. In Figure 5 the data have been computed on a rate (I/Time) basis and plotted as a series of asymmetric, bell-shaped curves. Each curve records the rate with 100- 80 o o UJ UJ 40 20. 10 15 TEMPERATURE (°C.) 20 25 30 FIGURE 5. The rate (100/Weeks) of initiation of adult development at 25° C. after preliminary exposure to 21/->-30° C. for 0-15 weeks. which adult development is initiated at 25° C. after a particular period of prelimi- nary exposure to temperatures ranging from 2y2 to 30° C. For comparison, the corresponding rate in the absence of any preliminary treatment has been recorded as the straight line paralleling the X-axis. Exposure to any of these temperatures for less than 5 weeks is without detect- able effects on the subsequent rate of development at 25° C.—a conclusion already noted in the experiments at 6° C. After 5 weeks of the preliminary treatment, the distribution of results becomes bimodal at 6, 10, and 15° C. (see Table III). In Figure 5 this fact is not evident in the 5-week curve because the plotted points de- scribe the primary mode in each of the three bimodal distri^ ations. However, the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble th
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
