Abstract
For long-distance migratory songbirds, morphological traits such as longer wings and a smaller body size are predicted to increase migration efficiency. Due to previous limitations in our ability to track the long-distance journeys of small-bodied birds, the relationship between morphology and start-to-finish migration performance has never been fully tested in free-living songbirds. Using direct-tracking data obtained from light-level geolocators, we examined the effects of morphological factors (wing and body size) on spring and fall migration performance (flight speed, duration of stopovers, total stopovers taken) of a widely distributed, trans-hemispheric migratory songbird, the purple martin (Progne subis) (n = 120). We found that smaller-bodied birds spent fewer days at stopovers along fall migration, but larger-bodied birds spent fewer days at stopover and took fewer stopovers during spring migration. More of the variation in fall migration performance was explained by morphology, as compared to spring migration, possibly indicating a larger influence of environmental conditions on spring performance. Overall, our results partially support long-standing and previously untested predictions regarding the influence of intrinsic factors on migration performance. Future research should examine the influence of environmental variation on migration performance as well as additional morphological traits that may contribute to migration performance.
References
[1] Berthold P., Bird Migration: A General Survey, Oxford University Press, Oxford, 2001. Search in Google Scholar
[2] Åkesson S., Hedenström A., How migrants get there: migratory performance and orientation. BioScience, 2007, 57, 123-133 10.1641/B570207Search in Google Scholar
[3] Dingle H., Drake V.A., What is migration? Bioscience, 2007, 57, 113-121 10.1641/B570206Search in Google Scholar
[4] Newton I., The Migration Ecology of Birds, Academic Press, Elsevier, London, 2008. Search in Google Scholar
[5] Egevang C., Stenhouse I.J., Phillips R.A., Petersen A., Fox J.W., Silk J.R., et al., Tracking of Arctic terns (Sterna paradisaea) reveals longest animal migration, Proc Natl Acad Sci U S A, 2010, 107, 2078-2081 10.1073/pnas.0909493107Search in Google Scholar
[6] Fraser K.C., Stutchbury B.J., Kramer P., Silverio C., Barrow J., Newstead D., et al., Consistent range-wide pattern in fall migration strategy of purple martin (Progne subis), despite different migration routes at the Gulf of Mexico, Auk, 2013, 130, 291-296 10.1525/auk.2013.12225Search in Google Scholar
[7] Alerstam T., Bird flight and optimal migration, Trends Ecol Evol, 1991, 6, 210-215 10.1016/0169-5347(91)90024-RSearch in Google Scholar
[8] Alerstam T., Bird Migration, Cambridge University Press, Cambridge, 1993 Search in Google Scholar
[9] Hedenström A., Migration by soaring or flapping flight in birds: the relative importance of energy cost and speed, Philos Trans R Soc Lond B Biol Sci, 1993, 342, 353-361 10.1098/rstb.1993.0164Search in Google Scholar
[10] Hedenström A., Alerstam T., Optimum fuel loads in migratory birds: distinguishing between time and energy minimization, J Theor Biol, 1997, 189, 227-234 10.1006/jtbi.1997.0505Search in Google Scholar PubMed
[11] Alerstam T., Hedenström A., Åkesson S., Long‐distance migration: evolution and determinants, Oikos, 2003, 103, 247-260 10.1034/j.1600-0706.2003.12559.xSearch in Google Scholar
[12] Pennycuick C.J., Mechanics of flight, Avian Biology, 1975, 5, 1-75 10.1016/B978-0-12-249405-5.50009-4Search in Google Scholar
[13] Smith R.J., Moore F.R., Arrival timing and seasonal reproductive performance in a long-distance migratory landbird, Behav Ecol Sociobiol, 2015, 57, 231-239 10.1007/s00265-004-0855-9Search in Google Scholar
[14] Kokko H., Gunnarsson T.G., Morrell L.J., Gill J.A., Why do female migratory birds arrive later than males? J Anim Ecol, 2006, 75, 1293-1303 10.1111/j.1365-2656.2006.01151.xSearch in Google Scholar PubMed
[15] Bowlin M.S., Sex, wingtip shape and wing-loading predict arrival date at a stopover site in the Swainson’s thrush (Catharus ustulatus), Auk, 2007, 124, 1388-1396 10.1093/auk/124.4.1388Search in Google Scholar
[16] McKinnon E.A., Fraser K.C., Stanley C.Q., Stutchbury B.J., Tracking from the tropics reveals behaviour of juvenile songbirds on their first spring migration, PLoS ONE, 2014, 9, e105605. 10.1371/journal.pone.0105605Search in Google Scholar PubMed PubMed Central
[17] Swaddle J.P., Witter M.S., The effects of molt on the flight performance, body mass, and behavior of European starlings (Sturnus vulgaris): an experimental approach, Can J Zool, 1997, 75, 1135-1146 10.1139/z97-136Search in Google Scholar
[18] Tarof S., Brown C., Purple Martin (Progne subis), In: A Poole, The Birds of North America, Online, http://bna.birds.cornell. edu/bna/species/287 Search in Google Scholar
[19] Gardner J.L., Peters A., Kearney M.R., Joseph L., Heinsohn R., Declining body size: a third universal response to warming? Trends Ecol Evol, 2011, 26, 285-291 10.1016/j.tree.2011.03.005Search in Google Scholar PubMed
[20] Rising J.D., Somers K.M., The measurement of overall body size in birds, Auk, 1989, 106, 666-674 Search in Google Scholar
[21] Senar J.C., Pascual J., Keel and tarsus length may provide a good predictor of avian body size, Ardea, 1997, 85, 269-274 Search in Google Scholar
[22] Bowlin M.S., Wikelski M., Pointed wings, low wingloading and calm air reduce migratory flight costs in songbirds, PLoS ONE, 2008, 3, e2154 10.1371/journal.pone.0002154Search in Google Scholar PubMed PubMed Central
[23] Saino N., Rubolini D., Ambrosini R., Romano M., Scandolara C., Fairhurst G., et al., Light-level geolocators reveal covariation between winter plumage molt and phenology in a trans- Saharan migratory bird, Oecologia, 2015, 178, 1105-112 10.1007/s00442-015-3299-1Search in Google Scholar PubMed
[24] Stutchbury B.J., Tarof S.A., Done T., Gow E., Kramer P.M., Tautin J., et al. Tracking long-distance songbird migration by using geolocators, Science, 2009, 323, 896 10.1126/science.1166664Search in Google Scholar PubMed
[25] Pyle P., Howell S.N., DeSante D.F., Yunick R.P., Identification guide to North American birds, Slate Creek Press, Bolinas, 1997 Search in Google Scholar
[26] Fraser K.C., Stutchbury B.J., Silverio C., Kramer P.M., Barrow J., Newstead D., et al. Continent-wide tracking to determine migratory connectivity and tropical habitat associations of a declining aerial insectivore, Proc Biol Sci, 2012, 279, 4901-4906 10.1098/rspb.2012.2207Search in Google Scholar PubMed PubMed Central
[27] Doughty R.W., Fergus R., The Purple Martin, University of Texas Press, Austin, 2002 Search in Google Scholar
[28] R Core Team, R: A Language and Environment for Statistical Computing, R Foundation for Statistical Computing, Vienna, 2011, URL: http://www.R-project.org/ Search in Google Scholar
[29] Hamilton T.H., The adaptive significances of intraspecific trends of variation in wing length and body size among bird species, Evolution, 1961, 15, 180-195 10.1111/j.1558-5646.1961.tb03142.xSearch in Google Scholar
[30] James, F.C., Geographic Size Variation in Birds and Its Relationship to Climate, Ecology, 1970, 51, 365-390 10.2307/1935374Search in Google Scholar
[31] Alatalo R.V., Gustafsson L., Lundberg A., Why do young passerine birds have shorter wings than older birds? Ibis, 1984, 126, 410-415 10.1111/j.1474-919X.1984.tb00264.xSearch in Google Scholar
[32] Pennycuick C.J., The mechanics of bird migration, Ibis, 1969, 111, 525-556 10.1111/j.1474-919X.1969.tb02566.xSearch in Google Scholar
[33] Newton I., Weather‐related mass‐mortality events in migrants, Ibis, 2007, 149, 453-467 10.1111/j.1474-919X.2007.00704.xSearch in Google Scholar
[34] Wikelski M., Tarlow E.M., Raim A., Diehl R.H., Larkin R.P., Visser G.H., Avian metabolism: costs of migration in free-flying songbirds, Nature, 2003, 423, 704 10.1038/423704aSearch in Google Scholar PubMed
[35] Allen R.W., Nice M.M., A study of the breeding biology of the Purple Martin (Progne subis), Am. Midl. Nat., 1952, 47, 606-665 10.2307/2422034Search in Google Scholar
[36] Van Buskirk J., Mulvihill R.S., Leberman R.C., Variable shifts in spring and autumn migration phenology in North American songbirds associated with climate change, Glob Chang Biol, 2009, 15, 760-771 10.1111/j.1365-2486.2008.01751.xSearch in Google Scholar
[37] Nilsson C., Klaassen R.H., Alerstam T., Differences in speed and duration of bird migration between spring and autumn, Am Nat, 2013, 181, 837-845 10.1086/670335Search in Google Scholar PubMed
[38] Gordo O., Why are bird migration dates shifting? A review of weather and climate effects on avian migratory phenology, Clim Res, 2007, 35, 37-58 10.3354/cr00713Search in Google Scholar
[39] Strandberg R., Alerstam T., The strategy of fly-and-forage migration, illustrated for the osprey (Pandion haliaetus), Behav Ecol Sociobiol, 2007, 61, 1865-1875 10.1007/s00265-007-0426-ySearch in Google Scholar
© 2015 Lawrence Lam et al.
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