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The uropygial gland is an exocrine gland located above the tail of birds that produces a diverse range of biochemicals. It has been hypothesized to be involved in chemical protection, water-proofing and maintenance of plumage brightness. Although these not necessarily mutually exclusive functions have received some empirical support, there has been little empirical research on the function of water-proofing.
Here we analyzed data for 229 individual eiders (Somateria mollissima) collected by Danish hunters during 2016?2018.
The Eider is a sea-duck that spends almost its entire life in sea water emphasizing water-proofing of the plumage. The size of the uropygial gland increased with body mass in males, but not in females, and it increased with age. The size of the uropygial gland decreased during winter. Eiders with small uropygial glands grew their feathers at a fast rate. Eiders with large wing areas had large uropygial glands.
These findings are consistent with large uropygial glands playing a role in water-proofing during molt and foraging, but also that uropygial glands may play a role in chemical defense.
The uropygial gland is an exocrine gland located above the tail of birds that produces a diverse range of biochemicals. It has been hypothesized to be involved in chemical protection, water-proofing and maintenance of plumage brightness. Although these not necessarily mutually exclusive functions have received some empirical support, there has been little empirical research on the function of water-proofing.
Here we analyzed data for 229 individual eiders (Somateria mollissima) collected by Danish hunters during 2016?2018.
The Eider is a sea-duck that spends almost its entire life in sea water emphasizing water-proofing of the plumage. The size of the uropygial gland increased with body mass in males, but not in females, and it increased with age. The size of the uropygial gland decreased during winter. Eiders with small uropygial glands grew their feathers at a fast rate. Eiders with large wing areas had large uropygial glands.
These findings are consistent with large uropygial glands playing a role in water-proofing during molt and foraging, but also that uropygial glands may play a role in chemical defense.
Bakken GS, Banta MR, Higginbotham CM, Lynott AJ. It's just ducky to be clean: The water repellency and water penetration resistance of swimming mallard Anas platyrhynchos ducklings. J Avian Biol. 2006;37:561-71.
Fülöp A, Czirják GA, Pap PL, Vágási CI. Feather-degrading bacteria, uropygial gland size and feather quality in House Sparrows Passer domesticus. Ibis. 2016;158:362-70.
Galván I. No effect of uropygial gland secretion on hatching success in great tits Parus major. Rev Ecol. 2011;66:93-7.
Galván I, Sanz JJ. Feather mite abundance increases with uropygial gland size and plumage yellowness in Great Tits Parus major. Ibis. 2006;148:687-97.
Galván I, Sanz JJ. The cheek plumage patch is an amplifier of dominance in Great Tits. Biol Lett. 2008;4:12-5.
Giraudeau M, Czirják GA, Duval C, Bretagnolle V, Eraud C, McGraw KJ, Heeb P. Effect of restricted preen-gland access on maternal self-maintenance and reproductive investment in mallards. PLoS ONE. 2010a;5:e13555.
Giraudeau M, Duval C, Guillon N, Bretagnolle V, Gutierrez C, Heeb P. Effects of access to preen gland secretions on mallard plumage. Naturwissenschaften. 2010b;97:577-81.
Giraudeau M, Czirják GA, Duval C, Bretagnolle V, Gutierrez J, Guillon N, Heeb P. Effect of preen oil on plumage bacteria: an experimental test with the mallard. Behav Proc. 2013;92:1-5.
Giraudeau M, Czirják GA, Duval C, Bretagnolle V, Gutierrez C, Heeb P. An experimental test in Mallards (Anas platyrhynchos) of the effect of incubation and maternal preen oil on eggshell microbial load. J Ornithol. 2014;155:671-7.
Grubb TC Jr. Ptilochronology. New York: Oxford University Press; 2006.
Jaatinen K, Öst M, Hobson KA. State-dependent capital and income breeding: a novel approach to evaluating individual strategies with stable isotopes. Front Zool. 2016;13:24.
Jacob S, Immer A, Leclaire S, Parthuisot N, Ducamp C, Espinasse G, Heeb P. Uropygial gland size and composition varies according to experimentally modified microbiome in Great tits. BMC Evol Biol. 2014;14:134.
Laursen K, Frikke J. Hunting from motorboats displaces Wadden Sea Eiders Somateria mollissima from their favoured feeding distribution. Wildl Biol. 2008;14:423-33.
Laursen K, Asferg K, Frikke J, Sunde P. Mussel fishery affects diet and reduces body condition of Eiders Somateria mollissima in the Wadden Sea. J Sea Res. 2009;62:22-30.
Meijer T, Drent R. Re-examination of the capital and income dichotomy in breeding birds. Ibis. 1999;141:399-414.
Moreno-Rueda G. House sparrows Passer domesticus with larger uropygial glands show reduced feather wear. Ibis. 2011;153:195-8.
Moreno-Rueda G. Preen oil and bird fitness: a critical review of the evidence. Biol Rev. 2017;92:2131-43.
Møller AP. Preening activity of swallows Hirundo rustica, in relation to experimentally manipulated loads of haematophagous mites. Anim Behav. 1991;42:251-60.
Møller AP, Erritzøe J, Nielsen JT. Predators and microorganisms of prey: Goshawks prefer prey with small uropygial glands. Funct Ecol. 2010;24:608-13.
Møller AP, Nielsen JT. The trade-off between rapid feather growth and impaired feather quality increases risk of predation. J Ornithol. 2018;159:165-71.
Nehls G, Ketzenberg C. Do common eiders Somateria mollissima exhaust their food resources? A study on natural mussel Mytilus edulis beds in the Wadden Sea. Dan Rev Game Biol. 2003;16:47-61.
Pap PL, Vágási CI, Osváth G, Murecan C, Barta Z. Seasonality in the uropygial gland size and feather mite abundance in house sparrows Passer domesticus: Natural covariation and an experiment. J Avian Biol. 2010;41:653-61.
Pennycuick CJ. Modelling the flying bird. London: Academic Press; 2008.
Salibián A, Montalti D. Physiological and biochemical aspects of the avian uropygial gland. Braz J Biol. 2009;69:437-46.
Surmacki A. Preen waxes do not protect carotenoid plumage from bleaching by sunlight. Ibis. 2008;150:335-41.
Thomas RH, Price ER, Seewagen CL, Mackenzie SA, Bernards MA, Guglielmo CG. Use of TLC-FID and GC-MS/FID to examine the effects of migratory state, diet and captivity on preen wax composition in white-throated sparrows Zonotrichia albicollis. Ibis. 2010;152:782-92.
Vágási C, Pap PL, Vincze O, Osváth O, Erritzøe J, Møller AP. Morphological adaptations to migration in birds. Evol Biol. 2016;43:48-59.
Walther BA, Clayton DH. Elaborate ornaments are costly to maintain: evidence for high maintenance handicaps. Behav Ecol. 2005;16:89-95.
We thank the hunters from Denmark and Åland for collecting eiders.
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