. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 260 DONALD S. EARNER AND A. C. WILSON value of c would be approximately Engels and Jenner (1956) have ex- amined the effect of environmental temperature on the rate of testicular develop- ment in /. hyemalis subjected to daily photoperiods of 10-12 hours. Although differences in methods and analyses do not allow a direct comparison, it appears that c for this species must be of the order of Similarly, from the data log W. FIGURE 4. A comparison of predicted curves of testicular development with natural de-
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 260 DONALD S. EARNER AND A. C. WILSON value of c would be approximately Engels and Jenner (1956) have ex- amined the effect of environmental temperature on the rate of testicular develop- ment in /. hyemalis subjected to daily photoperiods of 10-12 hours. Although differences in methods and analyses do not allow a direct comparison, it appears that c for this species must be of the order of Similarly, from the data log W. FIGURE 4. A comparison of predicted curves of testicular development with natural de- velopment. Open circles represent combined testicular weights for first-year birds taken from the Snake River Canyon population; closed circles represent combined testicular weights for adults from the same population. These groups cannot be distinguished after the prenuptial molt which occurs in late March and early April. The four curves were calculated according to equation (4) including the adjustment for temperature effects indicated in equation (3). of Burger (1948) for 5". vulgaris we have estimated c to be about For these three species, then, it appears that the role of environmental temperature in testicular development is of a small, although similar, order of magnitude. A PREDICTED COURSE OF TESTICULAR DEVELOPMENT UNDER NATURAL CONDITIONS CALCULATED ON THE BASIS OF LABORATORY-ESTABLISHED RATES Using the empirical relationships presented above, an attempt has been made to "predict" the course of vernal testicular development. Since environmental. 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 the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 18
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