Carbon dioxide and blood-feeding shift visual cue tracking during navigation in < em > Aedes aegypti < /em > mosquitoes

Biol Lett. 2022 Sep;18(9):20220270. doi: 10.1098/rsbl.2022.0270. Epub 2022 Sep 28.ABSTRACTHaematophagous mosquitoes need a blood meal to complete their reproductive cycle. To accomplish this, female mosquitoes seek vertebrate hosts, land on them and bite. As their eggs mature, they shift attention away from hosts and towards finding sites to lay eggs. We asked whether females were more tuned to visual cues when a host-related signal, carbon dioxide, was present, and further examined the effect of a blood meal, which shifts behaviour to ovipositing. Using a custom, tethered-flight arena that records wing stroke changes while displaying visual cues, we found the presence of carbon dioxide enhances visual attention towards discrete stimuli and improves contrast sensitivity for host-seeking Aedes aegypti mosquitoes. Conversely, intake of a blood meal reverses vertical bar tracking, a stimulus that non-fed females readily follow. This switch in behaviour suggests that having a blood meal modulates visual attention in mosquitoes, a phenomenon that has been described before in olfaction but not in visually driven behaviours.PMID:36166270 | DOI:10.1098/rsbl.2022.0270

Source: Biology Letters - September 27, 2022 Category: Biology Authors: Elina Barredo Joshua I Raji Michael Ramon Matthew DeGennaro Jamie Theobald Source Type: research