Research Topics
| R DudleySummaryAffiliation: University of Texas Country: USA Publications
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Detail Information
Publications
Atmospheric oxygen, giant Paleozoic insects and the evolution of aerial locomotor performanceR Dudley
Department of Zoology, University of Texas, Austin, TX 78712, USA
J Exp Biol 201:1043-50. 1998..Such manipulations permit both paleophysiological simulation of ancestral locomotor performance and an analysis of maximal flight capacity in extant forms...- The evolutionary physiology of animal flight: paleobiological and present perspectivesR Dudley
Section of Integrative Biology, University of Texas, Austin 78712, USA
Annu Rev Physiol 62:135-55. 2000..Elevated oxygen levels in the mid- to late Mesozoic would, however, have facilitated aerodynamic force production and enhanced muscle power output for ancestral birds, as well as for precursors to bats and pterosaurs... - Limits to human locomotor performance: phylogenetic origins and comparative perspectivesR Dudley
Section of Integrative Biology, University of Texas at Austin, Austin, TX 78712 1064, USA
J Exp Biol 204:3235-40. 2001..Upregulation of aerobic capacity and parallel resistance to hypoxia may represent coupled evolutionary adaptations to flight under high-altitude conditions... - Fermenting fruit and the historical ecology of ethanol ingestion: is alcoholism in modern humans an evolutionary hangover?Robert Dudley
Section of Integrative Biology, University of Texas at Austin, 78712, USA
Addiction 97:381-8. 2002..Epidemiologically demonstrated health benefits of low-level alcohol consumption are consistent with an ancient and potentially adaptive exposure of primate frugivores to this most common of the psychoactive substances... - Hovering flight mechanics of neotropical flower bats (Phyllostomidae: Glossophaginae) in normodense and hypodense gas mixturesRobert Dudley
Section of Integrative Biology, University of Texas at Austin, Austin, TX 78712, USA
J Exp Biol 205:3669-77. 2002..Revised energetic estimates suggest that mechanical power expenditure of hovering glossophagines is comparable with that in slow forward flight... - Limits to flight energetics of hummingbirds hovering in hypodense and hypoxic gas mixturesP Chai
Department of Zoology, University of Texas, Austin 78712, USA
J Exp Biol 199:2285-95. 1996..Depending on the physical context, hummingbird flight performance can therefore be limited by oxygen availability or by flight aerodynamics... - Hummingbird hovering performance in hyperoxic heliox: effects of body mass and sexP Chai
Department of Zoology, University of Texas, Austin 78712, USA
J Exp Biol 199:2745-55. 1996..Sexual dimorphism in flight adaptation also played a role, with males showing more limited hovering capacities, presumably as a trade-off for increased maneuverability... - Kinematics of hovering hummingbird flight along simulated and natural elevational gradientsDouglas L Altshuler
Section of Integrative Biology, University of Texas at Austin, Austin, Texas 78712, USA
J Exp Biol 206:3139-47. 2003..By contrast, increases in wingbeat frequency impose substantial metabolic demands, are only elicited transiently and anaerobically, and cannot be used to generate additional sustained lift at high elevations... - Transient hovering performance of hummingbirds under conditions of maximal loadingP Chai
Department of Zoology, University of Texas, Austin 78712, USA
J Exp Biol 200:921-9. 1997..More generally, the study of performance limits in flying animals necessitates careful specification of behavioral context as well as quantitative determination of wing and body kinematics... - The ecological and evolutionary interface of hummingbird flight physiologyDouglas L Altshuler
Section of Integrative Biology, University of Texas at Austin, Austin, TX 78712, USA
J Exp Biol 205:2325-36. 2002.... 
Resolution of a paradox: hummingbird flight at high elevation does not come without a costDouglas L Altshuler
Section of Integrative Biology, University of Texas, Austin, TX 78712, USA
Proc Natl Acad Sci U S A 101:17731-6. 2004..In contrast to hovering, excess power availability decreased substantially across elevations, thereby reducing the biomechanical potential for more complex flight such as competitive and escape maneuvers...- Ethanol and methanol as possible odor cues for Egyptian fruit bats (Rousettus aegyptiacus)Francisco Sanchez
Mitrani Department of Desert Ecology, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, Midreshet Ben Gurion, Israel
J Chem Ecol 32:1289-300. 2006..Thus, ethanol at high concentrations may serve as a signal for bats to avoid overripe, unpalatable fruit... - The influence of ethanol on feeding in the frugivorous yellow-vented bulbul (Pycnonotus xanthopygos)Shunit Mazeh
Mitrani Department of Desert Ecology, Jacob Blaustein Institutes for Desert Research, Ben Gurion University of the Negev, 84990 Midreshet Ben Gurion, Israel
Behav Processes 77:369-75. 2008..0%). We suggest that decreasing food intake when food ethanol concentration is relatively high may be a means of avoiding intoxication and is related to the ethanol-metabolizing ability of the bird... - Allometry of kinematics and energetics in carpenter bees (Xylocopa varipuncta) hovering in variable-density gasesStephen P Roberts
Department of Biological Sciences, University of Nevada, Las Vegas, 4505 S Maryland Parkway, Las Vegas, NV 89154 4004, USA
J Exp Biol 207:993-1004. 2004..Larger bees operate near the envelope of maximal performance even in normodense hovering due to smaller body mass-specific flight muscles and limited reserve capacities for kinematics and power production... - Allometry of maximum vertical force production during hovering flight of neotropical orchid bees (Apidae: Euglossini)Michael E Dillon
Department of Biology, University of Washington, Seattle, WA 98195, USA
J Exp Biol 207:417-25. 2004..These findings suggest an adverse scaling of vertical force production at greater body mass even if flight muscle mass scales isometrically... - The cost of living large: comparative gliding performance in flying lizards (Agamidae: Draco)Jimmy A McGuire
Museum of Vertebrate Zoology, University of California, Berkeley, California 94720, USA
Am Nat 166:93-106. 2005..Such size-dependent variation in performance has important consequences for the ecology and evolution of flying lizards and other glissant taxa... - Aquatic wing flapping at low Reynolds numbers: swimming kinematics of the Antarctic pteropod, Clione antarcticaBrendan J Borrell
Department of Integrative Biology, University of California, Berkeley, CA 94720, USA
J Exp Biol 208:2939-49. 2005..These results indicate that, in addition to serotonin-mediated modulation of wingbeat frequency reported previously in Clione, geometric alteration of wingbeat kinematics offers a precise means of controlling swimming forces... - Directed aerial descent in canopy antsStephen P Yanoviak
University of Texas Medical Branch, 301 University Boulevard, Galveston, Texas 77555, USA
Nature 433:624-6. 2005..This is the first study to document the mechanics and ecological relevance of this form of locomotion in the Earth's most diverse lineage, the insects...