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Article: Assessing the aerodynamic effects of tail elongations in the house martin (Delichon urbica): Implications for the initial selection pressures in hirundines

TitleAssessing the aerodynamic effects of tail elongations in the house martin (Delichon urbica): Implications for the initial selection pressures in hirundines
Authors
KeywordsTail streamers
Hirundines
Flight performance
Natural selection
Sexual selection
Issue Date2000
Citation
Behavioral Ecology and Sociobiology, 2000, v. 48, n. 5, p. 364-372 How to Cite?
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' three-dimensional 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 10-mm 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 have 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 streamerless hirundines.
Persistent Identifierhttp://hdl.handle.net/10722/230699
ISSN
2015 Impact Factor: 2.382
2015 SCImago Journal Rankings: 1.373

 

DC FieldValueLanguage
dc.contributor.authorPark, K. J.-
dc.contributor.authorEvans, M. R.-
dc.contributor.authorBuchanan, K. L.-
dc.date.accessioned2016-09-01T06:06:34Z-
dc.date.available2016-09-01T06:06:34Z-
dc.date.issued2000-
dc.identifier.citationBehavioral Ecology and Sociobiology, 2000, v. 48, n. 5, p. 364-372-
dc.identifier.issn0340-5443-
dc.identifier.urihttp://hdl.handle.net/10722/230699-
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' three-dimensional 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 10-mm 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 have 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 streamerless hirundines.-
dc.languageeng-
dc.relation.ispartofBehavioral Ecology and Sociobiology-
dc.subjectTail streamers-
dc.subjectHirundines-
dc.subjectFlight performance-
dc.subjectNatural selection-
dc.subjectSexual selection-
dc.titleAssessing the aerodynamic effects of tail elongations in the house martin (Delichon urbica): Implications for the initial selection pressures in hirundines-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0033787877-
dc.identifier.volume48-
dc.identifier.issue5-
dc.identifier.spage364-
dc.identifier.epage372-

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