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By W. Danthanarayana (auth.), Professor Dr. Wijesiri Danthanarayana (eds.)

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Extra resources for Insect Flight: Dispersal and Migration

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The increased flight behavior of JHM-treated males occurred without a subsequent depression in flight activity (Fig. 78), suggesting that in the absence of ovaries, flight stimulation by JH may be more prolonged. This is similar to the effect of JH in male and ovariectomized female Oncopeltus [asciatus (Rankin 1974). As with O. [asciatus, precocene treatment inhibited both oogenesis and flight behavior in H. convergens, and JH replacement therapy restored both (Fig. 8). We have not investigated the possible involvement of the corpus cardiacum in flight in this species, nor have we pursued the mechanism of the JH effect on flight.

Similarly CC extracts injected into precocenetreated animals who were displaying no long-duration flight activity had no restorative effect on flight (Rankin and Riddiford 1977) nor did it elevate hemolymph lipid levels, while JH injection both stimulated flight behavior and caused a rapid increase in hemolymph lipid (Rankin, unpublished results). 2 Hippodamia convergens Another insect in which the role of JH in migratory flight has been examined is the ladybeetle, Hippodamia convergens. A. Rankin et al.

Genetic aspects. Biochem Genet 7 :127 -138 Palmer JO (1985) Ecological genetics of wing length, flight propensity, and early fecundity in a migratory insect. In: Rankin MA (ed) Migration: mechanisms and adaptive significance. Contrib Mar Sci (Suppl) 27 :653 -663 Parker GA, Stuart RA (1976) Animal behavior as a strategy optimizer: evolution of resource assessment strategies and optimal emigration thresholds. Am Nat 110:1055 -1076 Rabb RL, Stinner RE (1978) The role of insect dispersal and migration in population processes.

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