Supplementary material from "Conversion efficiency of flight power is low, but increases with flight speed in the migratory bat Pipistrellus nathusii " ...

• Main Authors: Currie, Shannon E., Johansson, Christoffer, Aumont, Cedric, Voigt, Christian C., Hedenström, Anders
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: The Royal Society 2023
• Subjects: Physiology; FOS Biological sciences; Ecology; 110601 Biomechanics; FOS Health sciences; Pipistrellus nathusii
• Online Access: https://dx.doi.org/10.6084/m9.figshare.c.6602651.v1; https://rs.figshare.com/collections/Supplementary_material_from_Conversion_efficiency_of_flight_power_is_low_but_increases_with_flight_speed_in_the_migratory_bat_i_Pipistrellus_nathusii_i_/6602651/1

The efficiency with which flying animals convert metabolic power to mechanical power dictates an individual's flight behaviour and energy requirements. Despite the significance of this parameter, we lack empirical data on conversion efficiency for most species as in vivo measurements are notoriously difficult to obtain. Furthermore, conversion efficiency is often assumed to be constant across flight speeds, even though the components driving flight power are speed dependent. We show, through direct measurements of metabolic and aerodynamic power, that conversion efficiency in the migratory bat ( Pipistrellus nathusii ) increases from 7.0% to 10.4% with flight speed. Our findings suggest that peak conversion efficiency in this species occurs near maximum range speed, where the cost of transport is minimized. A meta-analysis of 16 bird and 8 bat species revealed a positive scaling relationship between estimated conversion efficiency and body mass, with no discernible differences between bats and birds. This ...