Escape flight performances of night-active malaria mosquitoes the role of visual and airflow cues of an approaching object


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


93-11  Sat Jan 2  Escape flight performances of night-active malaria mosquitoes: the role of visual and airflow cues of an approaching object Cribellier, A*; Spitzen, J; Straw, AD; van Leeuwen, JL; Muijres, FT; Wageningen University, Wageningen, The Netherland; Wageningen University, Wageningen, The Netherland; Freiburg University, Freiburg, Germany; Wageningen University, Wageningen, The Netherland; Wageningen University, Wageningen, The Netherland antoine.cribellier@wur.nl

Female malaria mosquitoes have to blood feed on humans for egg development. In response, humans have developed defensive behaviors and therefore mosquitoes need to avoid being swatted while seeking for a blood meal. But the evasive maneuver dynamics of mosquito has not yet been studied. In contrast, various other species of flying insects have been shown to have great abilities in evading threatening objects. These studies focused on how insects responded to visual or auditory cues, and the role of airflow produced by the approaching object has been mostly ignored. Because malaria mosquitoes are night-active, airflow cues and airflow induced passive maneuvers might be particularly important. Here, we studied how malaria mosquitoes Anopheles coluzzii use airflow to evade a rapidly moving object in low light condition. For this, we build a flight arena with a real-time insect tracking system and an automated mosquitoes swatter. By systematically changing light intensity in the arena and the swatter disk type, we tested how escape performance changed with variations in visual cues and airflow cues generated by the swatter. We found that mosquito escape velocities were higher in bright light condition and when the swatter generated high air movements. This suggest that mosquitoes do use both airflow and visual cues to trigger their evading responses. Finally, we investigated if those maneuvers are passively induced by the airflow.

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