. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. II 10 J> o 9 Z 8 ^ 7 ° 6 I ^ § 4 Z 3 10 20 30 40 50 60 70 80 90 100 Adult Age (days). Interval after First Parturition (days) II 1 FIGURE 1. Graphic representation of morphological changes in the corpora aliata of adult females of Lcucophaca maderac in conjunction with reproductive cycles. - —•— —•— -= vol- ume of both corpora aliata in million ; - —O O— - — number of nuclei, calculated for both glands; - - = nuclear-cytoplasmic ratio (number of ). Diagram includes (I) entire period of first re
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. II 10 J> o 9 Z 8 ^ 7 ° 6 I ^ § 4 Z 3 10 20 30 40 50 60 70 80 90 100 Adult Age (days). Interval after First Parturition (days) II 1 FIGURE 1. Graphic representation of morphological changes in the corpora aliata of adult females of Lcucophaca maderac in conjunction with reproductive cycles. - —•— —•— -= vol- ume of both corpora aliata in million ; - —O O— - — number of nuclei, calculated for both glands; - - = nuclear-cytoplasmic ratio (number of ). Diagram includes (I) entire period of first reproductive cycle (from emergence of adult to first parturi- tion at about 100 days of adult age), (II) second reproductive cycle (from first parturition to early part of second pregnancy). In this and subsequent figures of this series the curves do not represent mathematically correct summaries of the quantitative data which do not lend themselves to such treatment; they are merely intended to facilitate the visualization of the changes over the periods indicated. Note that volumetric changes are paralleled by changes in nuclear numbers and in nuclear-cytoplasmic ratios. For details see text. as those of newly emerged females. This level was maintained throughout "pregnancy" to be followed by a more pronounced and more rapid rise (maximum volume million ^3) reached after 15 days in the pre-ovulation period of the second cycle. A study of this and older groups (Table I) indicated that essentially the same periodic changes in corpus allatum volume in conjunction with alternating phases of activity and inactivity occur in consecutive reproductive cycles. The first cycle differs from the subsequent ones only in degree in that the volumetric maximum is lower and is reached more slowly. In this respect our data agree with those of Engelmann (1957). We came to different results, however, with respect to the remarkable cellular changes accompanying th
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
