Studies On The Population Ecology Of Aleuroglyphus Ovatus (Troupeau)(Acari: Acaridae)

Aleuroglyphus ovatus (Troupeau), 1878 has a worldwide distribution and belongs to the commonest pests of various food.This paper studies systematically on population ecology of A. ovatus.The main results were as follows:1. Effect of temperature on development of A.ovatus: The duration among all immature stages were shortened with increasing temperature. Between 20℃and 32℃, developmental time was 39.13 days at 20℃and 14.7 days at 32℃. The analysis suggested that the relationship between development and temperatures was fitter for logistic equation model. And the developmental threshold temperature and effective temperature summation of different developmental stages were worked out by the linear regression equation and Lidian-mo's optional methods. And we considered that Lidian-mo's optional methods is better than the linear regression equation by C.V.2. The experimental population life tables of A.ovatus: The longest longevity was 42.870 days at 20℃, and the maximum total eggs per female were 70.828 at 28℃. The experimental population life tables of A.ovatus were constructed at 20℃,24℃,28℃and 32℃. The results showed that the net reproductive rate(R₀) reached the highest values of 45.532 at 28℃, and the intrinsic rate of natural increase (r_m) and finite rate of increase (λ) increased with temperature to a peak of 0.156 and 1.169 at 28℃. The time for population to double was shortest of 4.431 days at 28℃. However, the sex ratio was increased with increasing temperatures.3. The influence of higher temperature(37℃-49℃) on different stages of A.ovatus: At 49℃,it taked 35min to kill all the adults,30min to all the tonymphs and 25min to all the larva, but it taked 42h to kill all the adults,21h to kill all the tonymphs and 18h to kill all the larva at 40℃. At 37℃, it could continue growth.4. The predation of Cheyletidae to A.ovatus: the predaceous role of 3 mites of Cheyletidae to A. ovatus was studied in different density, the results showed that the number of feeding was the maxium for Cheyletus eruditus. At five constant temperatures, all the functional response of Cheyletus eruditus on A.ovatus exhib ited Holling's Type-â…¡functional response. The adult female of Cheyletus eruditus was the most efficient predatory stage, followed by the adualt male, tonymph and larva; Among all stages and temperatures, adult female was the most efficient predatory stage at 28℃. The predator's density affected its preying ratio and the preying ratio decreased with the increasing predator's density.