Some factors influencing phase characters in the nymphs of the locust, Locusta migratoria migratorioides (R. and F.)

摘要: 1. WhenLocusta nymphs are reared crowded they generally show a number of characteristics that typical swarm populations in the field, i.e. march well, have low F/C ratios and black orange colour later instars. Nymphs isolation, on other hand, marching activity, high green or fawn colour. Thus, nymphs' own rearing conditions profoundly affect these characters. 2. Newly hatched vary from jet to fawn. During first second instars, were pale at hatching marched less than those dark. However, rapidly became more important factor, so by third instar, showed similar behaviour dark hatching. 3. The experiments shown parents grandparents etc. also influence expression phase characters offspring line locusts continuously isolation there was an accumulation thesolitaria generation generation. 4. The various appear be related general way, but steady cumulative effect colour. 5. As regards both colour, results suggested during females towardssolitaria easily males, while under crowding retainedsolitaria morphometrics longer males.