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Keywords: dragonfly
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Journal Articles
J Exp Biol (2019) 222 (5): jeb188508.
Published: 01 March 2019
...Rudolf J. Schilder; Hannah Stewart ABSTRACT We previously demonstrated the existence of a naturally occurring metabolic disease phenotype in Libellula pulchella dragonflies that shows high similarity to vertebrate obesity and type II diabetes, and is caused by a protozoan gut parasite. To further...
Journal Articles
J Exp Biol (2018) 221 (19): jeb171199.
Published: 04 October 2018
...Csaba Hefler; Huihe Qiu; Wei Shyy ABSTRACT We investigated the characteristics of interwing aerodynamic interactions across the span of the high aspect ratio, flexible wings of dragonflies under tethered and free-flying conditions. This revealed that the effects of the interactions on the hindwings...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (19): 3447–3456.
Published: 01 October 2014
... this hypothesis in dragonflies by measuring the oxygen sensitivity of flight metabolic rates and behavior during hovering for 11 species of dragonflies that ranged in mass by an order of magnitude. We measured flight times and flight metabolic rates in seven oxygen concentrations ranging from 30% to 2.5...
Includes: Supplementary data
Journal Articles
J Exp Biol (2012) 215 (17): 3018–3027.
Published: 01 September 2012
... repeatable measurements of the reconstructed wing deformations. Using an Eastern pondhawk ( Erythimus simplicicollis ) dragonfly for demonstration, we quantify and visualize the wing twist and camber in both the chord-wise and span-wise directions, and discuss the implications of the results. In particular...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2008) 211 (2): 224–233.
Published: 15 January 2008
... Science Foundation grant Le905/8-1. References Alexander, D. E. ( 1984 ). Unusual phase relationships between the forewings and hindwings in flying dragonflies. J. Exp. Biol. 109 , 379 -383. Alexander, D. E. ( 1986 ). Wind tunnel studies of turns by flying dragonflies. J. Exp. Biol...
Journal Articles
J Exp Biol (2007) 210 (24): 4298–4306.
Published: 15 December 2007
...Rudolf J. Schilder; James H. Marden SUMMARY In previous work, we found that dragonflies infected with gregarine gut parasites have reduced muscle power output, loss of lipid oxidation in their flight muscles, and a suite of symptoms similar to mammalian metabolic syndrome. Here, we test...
Journal Articles
J Exp Biol (2005) 208 (19): 3785–3804.
Published: 01 October 2005
...Ji Kang Wang; Mao Sun SUMMARY The aerodynamics and forewing-hindwing interaction of a model dragonfly in forward flight are studied, using the method of numerically solving the Navier-Stokes equations. Available morphological and stroke-kinematic parameters of dragonfly ( Aeshna juncea ) are used...
Journal Articles
J Exp Biol (2004) 207 (26): 4707–4726.
Published: 15 December 2004
...Will J. Maybury; Fritz-Olaf Lehmann SUMMARY Insects flying with two pairs of wings must contend with the forewing wake passing over the beating hindwing. Some four-winged insects, such as dragonflies, move each wing independently and therefore may alter the relative timing between the fore...
Journal Articles
J Exp Biol (2004) 207 (24): 4299–4323.
Published: 15 November 2004
...Adrian L. R. Thomas; Graham K. Taylor; Robert B. Srygley; Robert L. Nudds; Richard J. Bomphrey SUMMARY Here we show, by qualitative free- and tethered-flight flow visualization,that dragonflies fly by using unsteady aerodynamic mechanisms to generate high-lift, leading-edge vortices. In normal free...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2004) 207 (22): 3999–4009.
Published: 15 October 2004
...Richard O. Prum; Jeff A. Cole; Rodolfo H. Torres SUMMARY For nearly 80 years, the non-iridescent, blue, integumentary structural colours of dragonflies and damselflies (Odonata) have been attributed to incoherent Tyndall or Rayleigh scattering. We investigated the production of the integumentary...
Journal Articles
J Exp Biol (2004) 207 (11): 1887–1901.
Published: 01 May 2004
...Mao Sun; Shi Long Lan SUMMARY Aerodynamic force generation and mechanical power requirements of a dragonfly ( Aeschna juncea ) in hovering flight are studied. The method of numerically solving the Navier–Stokes equations in moving overset grids is used. When the midstroke angles of attack...
Journal Articles
J Exp Biol (2004) 207 (5): 767–776.
Published: 15 February 2004
... systems and non-biological systems is proportional to motor mass 1.0 . Here we trace the mechanisms that cause dragonflies to achieve a change from muscle mass 0.67 scaling of maximum force output by single flight muscles to mass 1.0 scaling of dynamic force output by the intact dragonfly flight motor...
Journal Articles
J Exp Biol (2003) 206 (4): 745–757.
Published: 15 February 2003
...Hao Wang; Lijiang Zeng; Hao Liu; Chunyong Yin SUMMARY A robust technique for determining the wing kinematics, body position and attitude of a free-flight dragonfly is described. The new method is based on a projected comb-fringe technique combined with the natural landmarks on a dragonfly, allowing...
Journal Articles
J Exp Biol (2001) 204 (20): 3457–3470.
Published: 15 October 2001
...James H. Marden; Gail H. Fitzhugh; Mahasweta Girgenrath; Melisande R. Wolf; Stefan Girgenrath SUMMARY The flight muscles of Libellula pulchella dragonflies contain a mixture of six alternatively spliced transcripts of a single troponin T (TnT) gene. Here, we examine how intraspecific variation...
Journal Articles
J Exp Biol (1991) 159 (1): 135–147.
Published: 01 September 1991
...M. PECKHAM; D.C. S. WHITE The mechanical properties of demembranated muscle fibres of synchronous flight muscle from a dragonfly Libellula quadrimaculata , asynchronous flight muscle from the giant waterbug Lethocerus indicus and synchronous psoas muscle from rabbit were compared in relaxed, active...
Journal Articles
J Exp Biol (1991) 158 (1): 325–342.
Published: 01 July 1991
...MICHAEL L. MAY Most studies of insect flight deal primarily with hovering or with forward flight at constant, moderate speed. This paper reports investigations of flight characteristics that are especially relevant to the performance of dragonflies at high and/or changing velocity. Dragonflies were...
Journal Articles
J Exp Biol (1988) 137 (1): 221–252.
Published: 01 July 1988
...Akira Azuma; Tadaaki Watanabe The dragonfly, Anaxparthenope Julius (Brauer) was observed in free flight, and a theoretical analysis of flight performance at various speeds was carried out. The variation with time of forces and moments acting on wings and body in steady trimmed flight was calculated...