A Study On The Effect Of Temperature,relative Humidity And Illuminance On The Entomological Parameters Of Aedes Albopictus

Object:To explore the effects of temperature,relative humidity and illumination on the biological parameters related to the population growth of Aedes albopictus in Guangzhou,and to understand the changes of each parameter with each factor,so as to provide data support for the establishment of the population dynamic model driven by meteorological factors and the dynamic model of the transmission of related vector-borne diseases.Methods:Based on the life table technique,the life history of the field strains of Aedes albopictus in Guangzhou were observed under different meteorological conditions.In the process of hatching,larva growth and adult survival and reproduction of Aedes albopictus,the biological traits including hatching rate,hatching time,transition rate,pre-adult development period,adult survival time and oviposition amount were recorded,and the effects of temperature,humidity and illumination on the biological characteristics of Aedes albopictus of Guangzhou strain were compared and analyzed.The entomological parameters related to population growth dynamics were calculated,including development rate,death rate and spawning?reproduction?rate in different stages.The relationship between parameters and meteorological factors was understood by using GAM model and polynomial regression.Results:?1?The results showed that the hatchability of the eggs in the middle temperature range?22-30??was significantly higher than that in the low temperature group and the high temperature group,and the hatchability in the middle illumination group?500 lux?was also higher than that in the low illumination group and the high illumination group.The development rate of the egg stage under the medium light intensity?500 lux?was higher than that of the other two groups?100 lux,900 lux respectively?.The results of GAM regression model showed that when the temperature was lower than 29?,the hatching rate increased with the increase of temperature;when the temperature was higher than 29?,the hatching rate decreased slowly.The functions of development rate and temperature in the low light group,the middle light group and the high light group are:Y₁=0.178+0.213T-0.242T²,Y₂=0.257+0.346T-0.095T²,Y₃=0.203+0.099T-0.341T².?2?The development of Aedes albopictus in larval and pupal stages is mainly affected by temperature and relative humidity.In the temperature range of 22-30?,the adult rate of larva is the highest,the development rate first increases and then decreases with the increase of temperature,and reaches the highest development rate at about 32?.Taking the low humidity group as a reference,the average transition rate of the high humidity group increased by 0.015/d.The regression equation of larval development rate on temperature and relative humidity is as follows:Y₄=0.073+0.172T-1.102T²-0.048T³+0.012RH₂+0.023RH₃??3?The survival time of adult mosquitoes was affected by temperature and relative humidity,but not by light intensity.The survival time of adult mosquito increased with the increase of humidity,and the humidity effect was more significant at low temperature.The mean survival time of middle humidity group was 15.64 days longer than that of low humidity group,and that of high humidity group was 21.40 days longer than that of low humidity group.When the temperature is lower than about 18?,the average survival time of Aedes albopictus increases with the temperature;when the temperature is higher than about 18?,the survival time increases with the temperature,and decreases slowly.The polynomial regression equation of adult mortality rate with respect to temperature and relative humidity is as follows:Y₅=0.101+0.317T+0.280T²+0.133T³+0.107T⁴-0.014RH₂-0.026RH₃?The oviposition rate is affected by temperature and relative humidity.The regression equation is:Y₆=1.231+1.718T-9.600T²-4.913T³+4.802T⁴+1.492RH₂+1.644RH₃?Conclusions:?1?The life activities of Aedes albopictus were affected by environmental temperature,relative humidity and light intensity.The hatching of eggs was affected by temperature and light intensity.The growth and development of larval and pupal stages,the survival and reproduction of adult mosquitoes were mainly affected by temperature and relative humidity.?2?Polynomial regression analysis can well fit the relationship between the development rate of Aedes albopictus,adult mortality rate,oviposition rate and meteorological factors,and provide data support for the establishment of population dynamic model driven by meteorological factors and the transmission dynamics model of related vector infectious diseases.