By W. Danthanarayana (auth.), Professor Dr. Wijesiri Danthanarayana (eds.)
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Extra info for Insect Flight: Dispersal and Migration
Plexippus has frequently been reported to migrate at a time when the ovaries are immature or regressed, it was of interest to determine whether our flight assay would identify an oogenesis-flight syndrome in this species. 5 as adults; in a second experiment animals were field collected as spring migrants. Decrease in flight activity with ovarian development was much more striking in lab-reared animals (Fig. 9A) than in spring migrants (Fig. 9B). Possibly spring migrants, which are emerging from the winter diapause, tolerate more ovarian development as an adaptation for rapid exploitation of the northern breeding grounds.
10. 5 III acetone. Injections were given through the intersegmental membrane between the 2nd and 3rd abdominal tergites using a calibrated 5 III micropipette pulled to a fme tip. A tether-attachment device (strapping tape doubled so that fibers in the two pieces of tape were at right angles to one another) was affIxed to the dorsal mesothoracic cuticle with rubber cement and remained in place for the lifetime of the animal. Butterflies were attached to the tether via a small hole made in the tape; the tether consisted of a fIShhook swivel which passed through the hole in the tape at one end and which was suspended from its other end by a light wire which was in tum attached to a flight rack.
8). These results indicate that JH stimulates migratory flight behavior in this species along with reproductive development. It is likely that the hormone serves to coordinate migration with reproduction in the young adult. Higher doses of JHM (10 Ilgjanimal) seemed to have a dual effect in females, increasing flight and stimulating ovarian development. The sharp decline in flight on day 8 among females given 10 Ilg JHM may have been due to an ovarian-based inhibitory effect (Fig. 7; Rankin and Rankin 1980a).
Insect Flight: Dispersal and Migration by W. Danthanarayana (auth.), Professor Dr. Wijesiri Danthanarayana (eds.)