rsif.2021.0058.pdf (2.04 MB)
Gravity and active acceleration limit the ability of killer flies (Coenosia attenuata) to steer towards prey when attacking from above
journal contribution
posted on 2023-06-10, 01:21 authored by Sergio RossoniSergio Rossoni, S T Fabian, G P Sutton, P T Gonzalez-BellidoInsects that predate aerially usually contrast prey against the sky and attack upwards. However, killer flies (Coenosia attenuata) can attack prey flying below them, performing what we term 'aerial dives'. During these dives, killer flies accelerate up to 36 m s -2. Although the trajectories of the killer fly's dives appear highly variable, proportional navigation explains them, as long as the model has the lateral acceleration limit of a real killer fly. The trajectory's steepness is explained by the initial geometry of engagement; steep attacks result from the killer fly taking off when the target is approaching the predator. Under such circumstances, the killer fly dives almost vertically towards the target, and gravity significantly increases its acceleration. Although killer flies usually time their take-off to minimize flight duration, during aerial dives killer flies cannot reach the lateral accelerations necessary to match the increase in speed caused by gravity. Since a close miss still leads the predator closer to the target, and might even slow the prey down, there may not be a selective pressure for killer flies to account for gravity during aerial dives.
History
Publication status
- Published
File Version
- Published version
Journal
Journal of the Royal Society InterfaceISSN
1742-5689Publisher
The Royal SocietyExternal DOI
Issue
178Volume
18Page range
1-12Article number
a20210058Event location
EnglandDepartment affiliated with
- Evolution, Behaviour and Environment Publications
Full text available
- Yes
Peer reviewed?
- Yes