Abstract:

Temperature was one of the important ecological factors for development and reproduction of Mononychellus tanajioa. In order to learn about the ecological adaptation of M. tanajoa after its invasion into our country and provide a foundation for the monitoring early warning and effective prevention as well as analyze its invasion, diffusion and ecological adaptation mechanism, this study researched the effect of high-temperature treatment to its eggs on the development, reproduction. M. tanajoa eggs were treated for different time (0.5, 1, 2, 4, 8, 16 and 24 h) at a gradient of high-temperature (30, 33, 36, 39 and 42℃) in the artificial climate incubator, followed by incubation at room temperature (25℃). The developing periods, hatchability of the offspring eggs, offspring sex ratio (female percent) and offspring adult mites' life were observed. The results showed that eggs in high temperature had a great effect on its development and fecundity. With the increasing of temperature and extending of treatment time, its development significantly extended and egg hatching rate, percentage of female offspring and life of female offspring significantly decreased. The higher the temperature was the more significant effects on its development and reproduction. Furthermore, the developments of its egg and larvae were much more significantly affected. Eggs in 42℃ for about more than 2 h would not hatch and finish any development in 25℃; eggs in 42℃ for about 1 h were its most heat-sensitive time. High-temperature stress to the eggs affected the growth, development and fecundity of M. tanajoa, and thereby affected the dynamic variability of the M. tanajoa population. Theses results above wiould be much helpful for in-deep studies on the mechanism of heat tolerance and ecological adaptation of M.tanajioa and constructed the theory basis and technical support for scientifically forming of quarantine policy and measure for M. tanajoa in China.