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Adaptation and carry over effects of extreme sporadic heat stress in Culex mosquitoes. | LitMetric

Adaptation and carry over effects of extreme sporadic heat stress in Culex mosquitoes.

Acta Trop

Department of Pathogen Biology, School of Basic Medicine, Nanjing Medical University, 101Longmian Avenue, Jiangning, Nanjing, 211166, PR China; Jiangsu Province Key Laboratory of Modern Pathogen Biology, Nanjing Medical University, Nanjing, China. Electronic address:

Published: December 2024

AI Article Synopsis

  • Mosquitoes are impacted by temperature changes, and the study looks at how Culex pipiens pallens (Cx. pallens) responds to sudden heat increases, examining both larvae and adult mosquitoes.
  • The results showed that extreme temperatures (especially 42 °C) lead to high mortality rates, with adult males being the most vulnerable compared to larvae and females.
  • Overall, prolonged heat exposure notably reduced larvae development and male reproductive success, indicating that temperature shifts can affect mosquito populations and inform pest management strategies.

Article Abstract

Mosquitoes, as temperature-sensitive ectothermic vectors, exhibit temperature-dependence. This study investigates Culex pipiens pallens (Cx. pallens) responses to abrupt temperature increases and their implications on mosquito physiology. First instar larvae (24hr post hatching) and newly enclosed adults (24hr post emergence) were separately exposed to heat shock regimes of 33 °C, 37 °C, and 42 °C for 3 days alongside a control temperature of 27 °C. Results showed that mortality was triggered at 42 °C within a day. Adult male mosquitoes were less tolerant to all temperatures than larvae and adult females (p < 0.05). Exposing larvae to constant temperatures for 3 days significantly decreased larvae's development time, growth rate and adult emergence (p < 0.05). Reproductive fitness was significantly reduced (p < 0.05) in males emerging from larvae exposed to 37 °C. Life table parameters showed significant increased mortality rate, kill power and decreased life expectancy at the embryonic stage (p < 0.05). Furthermore, heatwaves deactivated the Transient receptor protein ankyrin 1 at 37 °C (p < 0.05) in larvae but not adults. Calmodium, Heat shock protein 90, and small heat shock protein expression were significantly decreased in larvae at 37 °C (p < 0.05) as compared to larvae raised at 33 °C and 27 °C. In conclusion, we classified the heat waves into three categories: adaptable (33 °C), critical (37 °C), and fatal (42 °C). Prolonged exposure of Culex pallens larvae to extreme heat affects the male reproductive output. These findings may serve as an important reference for forecasting vector and pest dynamics and used to tailor mosquito prevention and control measures.

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Source
http://dx.doi.org/10.1016/j.actatropica.2024.107417DOI Listing

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