Objective By simulating low temperature, the parameters of the life table of Aedes aegypti mosquitoes at various developmental stages were studied to understand their population dynamics. Methods Laboratory Ae. aegypti from Danzhou city, Hainan province, China were reared at low temperature, and the development time and survival in all life stages and the oviposition of Ae. aegypti were recorded. The survival rate in all life stages was calculated, and the population dynamics was obtained by drawing a life table. Results At 17 °C, the hatching rate, pupation rate, eclosion rate, and maturation rate of Ae. aegypti were (14.83±1.53)%, (85.73±3.92)%, (96.11±5.71)%, and (13.43±0.90)%. The pre-adult development time of female and male Ae. aegypti was (18.17±0.67) and (17.82±0.36) d, respectively. The development time of the 1st and 4th instar larvae was longer than that of the 2nd and 3rd instar larvae, and the development time of the 4th instar larvae was the longest with (5.43±0.93) d. The adult sex ratio (female: male) was 0.43±0.03; the net productivity was 41.13±0.40; the intrinsic growth rate was 0.11±0.01; the generation span was (32.66±3.23) d; the finite rate of increase was (1.12±0.01)/d. The proportion of stable age was (88.11±1.97)% in the larval stage and (11.89±1.97)% in the adult stage. The proportion of stable age over 11 d for adult mosquitoes was (21.32±2.42)% and (78.68±2.42)% with stable age less than 11 d. The instantaneous birth rate was 0.13±0.01, and the instantaneous death rate was 0.02±0.00. Conclusion Ae. aegypti can complete its life cycle at 17 °C. The egg hatching rate is low, indicating that the egg stage may be a critical stage affecting the development of Ae. aegypti at low temperature, and it may be the key impact factor which limits spreading toward lower temperature areas for Ae. aegypti. At 17 °C, Ae. aegypti mosquito has low activity capacity, prolongs the development time of each stage. The longer adult stage may increase the chance of virus infection and transmission. The vector efficiency should be evaluated in combination with growth potential, activity, and biting ability
ZHAO Mei-jie, GUO Ning-ning, LIU Qi-yong, JIN Hua-feng, MENG Feng-xia, LIU Xiao-bo, GUO Yu-hong
. Life table of Aedes aegypti at low temperature[J]. Chinese Journal of Vector Biology and Control, 2022
, 33(6)
: 771
-775
.
DOI: 10.11853/j.issn.1003.8280.2022.06.001
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