关键词: 家蝇, 大头金蝇, 产卵选择

Abstract:

Objective To identify the choice of spawning substrates by Musca domestica and Chrysomya megacephala. Methods The choice of spawning substrates by M. domestica and C. megacephala in insect rearing cages was recorded in laboratory. The odor preference of adult M. domestica was measured using a Y-tube olfactometer. Results A total of 86.58%, 6.08% and 7.34% of M. domestica laid eggs on the three kinds of substrate, wheat bran, lean meat and fish meal, respectively. The difference between the first spawning substrate and the others was significant (F＝162.97；υ＝2，15；P＜0.01). In contrast, C. megacephala laid eggs only on lean meat. In the two-way choice test for odors using an olfactometer, most of the males and females of M. domestica and C. megacephala were orientated towards lean meat, with wheat bran as the control. 85.02% of the males and 72.81% of the females of C. megacephala chose lean meat, between which the difference was significant (F＝8.66； υ ＝1，18；P＜0.01); however, the gender difference was insignificant in M. domestica. As for the comparison between fresh substrates and substrates fed by larvae, 73.43% of M. domestica laid eggs on the fed wheat bran and 57.57% on the fed lean meat, while 100% of C. megacephala laid eggs on the fed fish meal and 72.88% on the fed lean meat. Each of the egg laying amount was statistically different from that on fresh substrates. Conclusion Odors of the spawning substrate and information substances left by the larvae of the same species have a significant impact on the choice of spawning substrates by M. domestica and C. megacephala, which is of guiding significance for the development of fly attractants and the improvement of the fecundity of flies.

Key words: Musca domestica, Chrysomya megacephala, Spawning behavior