Effects of sublethal exposure at low temperature on the two-sex life table parameters of Lasioderma serricorne(Coleoptera:Anobiidae)offspring
[Aim]Low temperature is one of the key methods for controlling the important tobacco storage pest Lasioderma serricorne in China,yet the population dynamics and resistance mechanism of L.serricorne to low temperature remains largely unexplored.Examining the sublethal impacts of low temperature exposure on insects could help us understanding their adaptive responses to low temperatures.This study aims to reveal the adaptive capacity of L.serricorne to low temperature and its population development potential under such conditions by analyzing the life table parameters of L.serricorne offspring affected by sublethal low temperature exposure.[Methods]To construct the time-mortality curve,we exposed the last instar larvae of L.serricorne to-20 ℃ for different time.Using this data,we calculated the lethal time for 10％and 50％mortalities(LT10 and LT50).Later,we constructed the age-stage,two-sex life tables for the survived F1 population by exposing the last instar larvae of the F0 generation of L.serricorne to-20 ℃for LT10 and LT50,respectively.[Results]The LT10 and LT50 values of the low temperature of-20℃ to the last instar larvae of L.serricorne were 5.32 and 12.84 min,respectively.More than 90％of the F1 individuals originated from the F0 population exposed to-20 ℃ for LT10 and LT50 survived and completed the whole life cycle.No significant differences in the total longevity from egg to adult,female adult longevity,net reproductive rate(R0),intrinsic rate of increase(rm)and finite rate of increase(λ)were found between the control population reared at 28 ℃ and the F1 populations from the F0 populations exposed to-20 ℃ for LT10 and LT50.However,compared to the control,exposure of the last instar larvae of the F0 generation to the low temperature of-20 ℃ for LT10 and LT50 significantly reduced the initial life expectancy of eggs and the 1st instar larvae,the 1st instar larval duration and the reproductive value of the whole larval stage of the F1 population,but increased the proportion of males in the F1 population.[Conclusion]Exposure of the last instar larvae of L.serricorne to-20 ℃ for LT10 and LT50 leads to decrease in the initial life expectancy and population reproductive rate of the F1 offspring.However,the population structure and the basic life table parameters remain normal.The results indicate that L.serricorne larvae have good adaptability to low temperatures,and the surviving individuals can quickly expand the population after undergoing low temperature treatment.
Lasioderma serricornelow temperaturesublethal timeage-stage life table
万方数据
维普
