. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MONARCH REPRODUCTIVE DIAPAUSE 97. 15 20 5 DAYS AT LD 25 10 15 20 FIGURE 3. Mean mature oocyte production (MO) and ejaculatory duct (ED) net wet weight changes in monarch butterflies held at LD25 for various intervals. Dashed line indicates diapause animals, and solid lines indicate prediapause (PrD) and postdiapause (PoD); vertical bars indicate SEM. Numbers of animals tested same as in Figures 1 and 2. 170% in pre- and postdiapause animals, respectively. Comparable, but quantita- tively less striking changes occurred in the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MONARCH REPRODUCTIVE DIAPAUSE 97. 15 20 5 DAYS AT LD 25 10 15 20 FIGURE 3. Mean mature oocyte production (MO) and ejaculatory duct (ED) net wet weight changes in monarch butterflies held at LD25 for various intervals. Dashed line indicates diapause animals, and solid lines indicate prediapause (PrD) and postdiapause (PoD); vertical bars indicate SEM. Numbers of animals tested same as in Figures 1 and 2. 170% in pre- and postdiapause animals, respectively. Comparable, but quantita- tively less striking changes occurred in the male ED (Figure 3). After 5 days at LD25 the mean net wet weight increase of these organs in diapause males was 37% and 78% that observed in pre- and postdiapause males, respectively. By contrast, the mean net wet weight increase of the ED in diapause males held at LD25 for 5 to 20 days was 246% ( mg), while the comparable values for pre- and postdiapause males were 107% and 224%, respectively. (Males differed from fe- males in that weight changes in the postdiapause ED more closely resembled those of diapause animals.) Comparable plots of the OV and CG data of Table I, and the AG and TG data of Table III, produced similar results. Thus, monarch re- productive diapause was characterized by a severe depression of JH-sensitive organ development during the first 5 days at LD25. Storage of monarchs at LD25 from 5 to 20 days, however, results in a developmental rate of the pertinent organs during diapause that apparently exceeds that observed in prediapause and postdiapause. Effect of juvenile hormone on diapause and postdiapause monarchs Diapause males and females were fed immediately after arrival in the labo- ratory, injected with 100 ^g AJH or used as controls, held at LD25 for 10 days, and then dissected. Comparable experiments were performed in each of 3 diapause months (, September November) in each of 2 years. The results of individual experiments, and the combi
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
