. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. -I 1 1 -I L. FIGURE 6. Effect of photoperiod and food quality on ovarian weight of H. convergent under either a 12L: 12D (A) or 16L: 8D (B) environmental regime. Each day three females were sacrificed and the weight of the fixed reproductive tract was determined. Solid circles, broken lines indicate females fed frozen aphids while solid circles, solid lines indicate females fed live aphids (P = for A, P < for B; Mann Whitney U test). animals were fed for only 3 days prior to starvation, flight activity was sig
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. -I 1 1 -I L. FIGURE 6. Effect of photoperiod and food quality on ovarian weight of H. convergent under either a 12L: 12D (A) or 16L: 8D (B) environmental regime. Each day three females were sacrificed and the weight of the fixed reproductive tract was determined. Solid circles, broken lines indicate females fed frozen aphids while solid circles, solid lines indicate females fed live aphids (P = for A, P < for B; Mann Whitney U test). animals were fed for only 3 days prior to starvation, flight activity was significantly enhanced over that of the fed control group (Fig. 7A). When beetles of euacr sex were fed for 7 days and then starved, flight activity was not significantly dif- ferent from that of fed controls at the P = .05 level, although it fell near the borderline of significance (Fig. 7B). Mean ovarian weight of fed controls after 11-12 days was mg. Starva- tion for 5 days after 7 days of food decreased this to a mean of mg while females fed for 3 days and starved for 6 days had a mean ovarian weight of mg. 33% of the females that were fed for 7 days and then starved oviposited at least once, while none of the females fed for only 3 days prior to starvation laid eggs. DISCUSSION In order to investigate the environmental and physiological factors which affect migratory behavior, one must study an insect in which migratory flight can be conveniently assayed in the laboratory and distinguished from "trivial" or appetitive flights. In a group such as the Diptera, in which the animals move about by flying, some ambiguity might exist in interpreting the significance of a long tethered flight. However, since Coleoptera usually move about by walking and fly only occasionally, the tendency to make long continuous flights is likely to indi-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
