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• W2334145045 endingPage "4122" @default.
• W2334145045 startingPage "4110" @default.
• W2334145045 abstract "SUMMARY In this study we compared the wing kinematics of 27 bats representing six pteropodid species ranging more than 40 times in body mass (Mb=0.0278–1.152 kg), to determine whether wing posture and overall wing kinematics scaled as predicted according to theory. The smallest species flew in a wind tunnel and the other five species in a flight corridor. Seventeen kinematic markers on the midline and left side of the body were tracked in three dimensions. We used phylogenetically informed reduced major axis regression to test for allometry. We found that maximum wingspan (bmax) and maximum wing area (Smax) scaled with more positive allometry, and wing loading (Qs) with more negative allometry (bmax∝Mb0.423; Smax∝Mb0.768; Qs∝Mb0.233) than has been reported in previous studies that were based on measurements from specimens stretched out flat on a horizontal surface. Our results suggest that larger bats open their wings more fully than small bats do in flight, and that for bats, body measurements alone cannot be used to predict the conformation of the wings in flight. Several kinematic variables, including downstroke ratio, wing stroke amplitude, stroke plane angle, wing camber and Strouhal number, did not change significantly with body size, demonstrating that many aspects of wing kinematics are similar across this range of body sizes. Whereas aerodynamic theory suggests that preferred flight speed should increase with mass, we did not observe an increase in preferred flight speed with mass. Instead, larger bats had higher lift coefficients (CL) than did small bats (CL∝Mb0.170). Also, the slope of the wingbeat period (T) to body mass regression was significantly more shallow than expected under isometry (T∝Mb0.180), and angle of attack (α) increased significantly with body mass [α∝log(Mb)7.738]. None of the bats in our study flew at constant speed, so we used multiple regression to isolate the changes in wing kinematics that correlated with changes in flight speed, horizontal acceleration and vertical acceleration. We uncovered several significant trends that were consistent among species. Our results demonstrate that for medium- to large-sized bats, the ways that bats modulate their wing kinematics to produce thrust and lift over the course of a wingbeat cycle are independent of body size." @default.
• W2334145045 created "2016-06-24" @default.
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• W2334145045 date "2010-12-01" @default.
• W2334145045 modified "2023-10-18" @default.
• W2334145045 title "The effect of body size on the wing movements of pteropodid bats, with insights into thrust and lift production" @default.
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• W2334145045 doi "https://doi.org/10.1242/jeb.043091" @default.
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• W2334145045 hasPublicationYear "2010" @default.
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