. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Social Biology of \Iisciiocyttarvs • Jeanne 137 20 15 10 < Workers Non-workers Males *—•. 15 Dec 25 14 Jan 24 3 13 Feb Figure 41. Adult populations, colony 342. 23 5 15 Mar 25 4 14 Apr 24 4 May they were counted as .such. On colon\- 268, for instance, XwM W rose to on 3 XoNCMiiber 1968, when the first two off- spring emerged (Fig. 26A). The queen was still the only "worker" from 3 to 5 November. After three days the ratio dropped then rose again as the two workers emerged. As the numbe
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Social Biology of \Iisciiocyttarvs • Jeanne 137 20 15 10 < Workers Non-workers Males *—•. 15 Dec 25 14 Jan 24 3 13 Feb Figure 41. Adult populations, colony 342. 23 5 15 Mar 25 4 14 Apr 24 4 May they were counted as .such. On colon\- 268, for instance, XwM W rose to on 3 XoNCMiiber 1968, when the first two off- spring emerged (Fig. 26A). The queen was still the only "worker" from 3 to 5 November. After three days the ratio dropped then rose again as the two workers emerged. As the number of work- ers on the nest increased, the effects of each newly emerging adult on the NwM/W ratio diminished. The same effect was seen in colonies 347 (Fig. ) and 310 (Fig. 27A). There was nomially no brood abortion accompanying this period of high XwM W ratio, probably because it was brief and larval secretion could make up for what the queen could not provide. Colony 342, however, was somewhat un- usual in that there was some abortion of lar\ae (a total of ten) and a rise in empt\' cells during this period (Fig. 21). This was apparently because the first two adults to emerge were nonworkers. This caused an unusually long period of high NwM/W ratio, long enough for the adults to require more food than the foragers could provide. The effects of this showed up as a stoppage of nest growth for two weeks, which was unusual for this stage of colony develop- ment, and also as a higher peak and more gradual decline of the larval duration curve (Fig. 14B) as compared with those for colonies 268 (Fig. 12B) and 310 (Fig. 13B). This anomaly supports the hypothe- sis. Thus there does appear to be a positive correlation between a rise in NwM/W ratio and an increase in abortion. The "critical ratio," or threshold, above which abortion begins probably depends on several fac- tors, which vary from one colony to an- other. Intuitively, a high ratio would cause abortion to b
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