. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OVARIAN REPRODUCTIVE CYCLE OF ASTERIAS 341 ., : 76670 ii, .. 38 095 H'y, 185 \ ', 15879 Asymmetric lv,,655 • , 199 534 ». , 46224 Hy,,340 \ ': 0954 Symmetric ly;,300 «, 300 000 11, 21268 H»,,140 \> Syn letric Asv '1:400 ly.:400 • 1:14350 14:90300 fi,29073 if., 34361 Hy.:240 : 16000 1333 \',16000 \' nc Asv Ivi 484 .,200012 Hi 48202 Hvi 224 \' 2678 Symmetric ly;,282 • ; , 285 506 n, 28323 Hyj,142 , \', 0004 metric 1/1 = 36540 H'yv220 \', 1633. i • "> Proportional duration of the stages FIGURE 5. Frequency distributi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OVARIAN REPRODUCTIVE CYCLE OF ASTERIAS 341 ., : 76670 ii, .. 38 095 H'y, 185 \ ', 15879 Asymmetric lv,,655 • , 199 534 ». , 46224 Hy,,340 \ ': 0954 Symmetric ly;,300 «, 300 000 11, 21268 H»,,140 \> Syn letric Asv '1:400 ly.:400 • 1:14350 14:90300 fi,29073 if., 34361 Hy.:240 : 16000 1333 \',16000 \' nc Asv Ivi 484 .,200012 Hi 48202 Hvi 224 \' 2678 Symmetric ly;,282 • ; , 285 506 n, 28323 Hyj,142 , \', 0004 metric 1/1 = 36540 H'yv220 \', 1633. i • "> Proportional duration of the stages FIGURE 5. Frequency distribution of stages of the annual reproductive cycle ofAsterias rubens during the period December 1974 to April 1977 (• - - •: stage 1; D - - D: stage 2; • - - •: stage 3; O - - O: stage 4); approximation of the theoretical and proportional duration of the stages (see: Tables II and III). tributions of its substages were not significantly different, and the same applies to the distributions of the substages. Essential data (the mean and the standard deviation) of the frequency distributions of the stages are summarized in Table II (columns 2 and 3). These data permit an approximation of the theoretical and the proportional duration of each stage, the excentricity of the proportional duration, its corresponding proportional area of each frequency distribution and each tail-probability. These results are given in Table II (columns 4 to 9). Spawning takes place when the ovaries pass from stage 4 into stage 1. Thus, the spawning period can be defined as the period in which part of the population is in stage 4 and another part in stage 1. The theoretical duration of the spawning period is identical with the theoretical overlap of stage 4 and stage 1. Assuming a normal distribution of spawning animals, the mean and the standard deviation of this dis- tribution can be found, just as the proportional duration of the spawning period, the proportional area and the tail-probab
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
