Mark-Release-Recapture Trial with <em>Aedes albopictus</em> (Diptera, Culicidae) Irradiated Males and the Influence of Climatic Factors

Aedes albopictus is considered one of the major invasive species in the world and can transmit viruses such as dengue, Zika, or chikungunya. The Sterile Insect Technique (SIT) can be used to suppress the native populations of Ae. albopictus. To support the development of the release strategy during the SIT application, Mark-Release-Recapture (MRR) studies are crucial. Mean-while, weather conditions can affect the MRR trial’s results and it is critical to understand the influence of climatic factors on the results. In October 2022 in Faro, Southern Portugal, 84,000 ir-radiated sterile males were released for three consecutive weeks and mosquitoes were recapture by Human Landing Collections (HLC) one, two, four and six days after. Generalised linear models with a negative binomial family and log function were used to estimate the factors asso-ciated with the number of recaptured mosquitoes, prevalence ratios, and the 95% confidence in-tervals (CI). A total of 84,000 sterile male mosquitoes were released, with 528 recaptured (0.8%) by HLC. The prevalence of recaptured mosquitoes was 23% lower when the wind intensity was moderate. Sterile-marked males had an average median distance travelled of 88.7 m. Median probability of daily survival and the average life expectancy were 61.6% and 2.1, respectively. Wild male population estimates was 443.33 males/ ha. Despite no statistically significant asso-ciation was found with humidity, temperature and precipitation, it is crucial to consider weather conditions during MRR trials analyses to obtain the best determinants estimation and a more ef-ficient application of SIT in an integrated vector management program.