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dc.contributor.authorPark, Kirstyen_UK
dc.contributor.authorEvans, Matthewen_UK
dc.contributor.authorBuchanan, Katherine Louiseen_UK
dc.description.abstractOf the three species of Hirundine that breed sympatrically across the U.K., one, the barn swallow, has outer tail feathers elongated into streamers, whereas the other two species, the house martin and the sand martin, do not. The tail streamer of the barn swallow is regarded as a classic example of a sexually selected trait. Recent evidence, however, has suggested that streamers may have evolved largely through natural selection for enhanced flight performance and increased maneuverability. We tested the hypotheses that small streamers 1) increase performance in turning flight, but 2) decrease performance in flight variables related to velocity. We manipulated the lengths of house martin outer tail feathers and measured changes in their free-flight performance, using stereo-video to reconstruct the birds’ 3D flight paths. Five flight variables were found to best describe individual variation in flight performance. Of these five, the three variables determining maneuverability predicted that flight performance would be optimized by a 6 to 10mm increase in the length of the outer tail feathers. In contrast, for mean velocity and mean acceleration, extension of the outer tail feathers appears to have a detrimental effect on flight performance. We suggest that the initial selection pressure for streamers in ancestral short-tailed ‘barn swallows’ was via natural selection for increased maneuverability. In addition, we propose that the benefits of increased maneuverability has differed between hirundines in the past, such that the cost of increasing the length of the outer tail feather has, to date, outweighed the benefits of doing so in streamer-less hirundines.en_UK
dc.publisherSpringer Verlagen_UK
dc.relationPark K, Evans M & Buchanan KL (2000) Assessing the aerodynamic effects of tail elongations in the house martin (Delichon urbica): Implications for the initial selection pressures in hirundines. Behavioral Ecology and Sociobiology, 48 (5), pp. 364-372.
dc.rightsThe original publication is available at www.springerlink.comen_UK
dc.subjectFlight performanceen_UK
dc.subjectTail streamersen_UK
dc.subjectsexual selectionen_UK
dc.subjectNatural selectionen_UK
dc.subjectBirds Anatomyen_UK
dc.subjectBirds Behavioren_UK
dc.subjectSexual selection in animalsen_UK
dc.titleAssessing the aerodynamic effects of tail elongations in the house martin (Delichon urbica): Implications for the initial selection pressures in hirundinesen_UK
dc.typeJournal Articleen_UK
dc.citation.jtitleBehavioral Ecology and Sociobiologyen_UK
dc.type.statusAM - Accepted Manuscripten_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationUniversity of Stirlingen_UK
dc.contributor.affiliationUniversity of Stirlingen_UK
rioxxterms.typeJournal Article/Reviewen_UK
local.rioxx.authorPark, Kirsty|0000-0001-6080-7197en_UK
local.rioxx.authorEvans, Matthew|en_UK
local.rioxx.authorBuchanan, Katherine Louise|en_UK
local.rioxx.projectInternal Project|University of Stirling|
Appears in Collections:Biological and Environmental Sciences Journal Articles

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