Abstract
Social odours, conspecific chemical signals, have been demonstrated in every class of vertebrate except birds. The apparent absence is surprising, as every bird examined has a functional olfactory system and many produce odours. The crested auklet (Aethia cristatella), a monogamous seabird, exhibits a distinctive tangerine-like scent closely associated with courtship. Using T-maze experiments, we tested whether auklets preferred conspecific odours and whether they distinguished between different types of scent, two prerequisites of chemical communication. Crested auklets exhibited: (i) an attraction to conspecific feather odour; (ii) a preference for two chemical components of feather scent (cis-4-decenal and octanal), which we identified as seasonally elevated; and (iii) differential responses to odours, as indicated by a preference for auklet odour, an aversion to mammalian musk, but no significant response to banana essence (amyl acetate). Our results suggest that crested auklets detect plumage odour and preferentially orientate towards this stimulus. The striking and well-described courtship display that involves the scented neck region, the 'ruff sniff', provides a conspicuous behavioural mechanism for odour transmission and the potential for scent assessment during sexual selection. Although the importance and full social function of chemical signals are just beginning to be understood in birds, including crested auklets, social odours promise to reveal a largely unexplored and possibly widespread means of avian communication.
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Selected References
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- Balthazart J., Schoffeniels E. Pheromones are involved in the control of sexual behaviour in birds. Naturwissenschaften. 1979 Jan;66(1):55–56. doi: 10.1007/BF00369365. [DOI] [PubMed] [Google Scholar]
- Bennett A. T., Cuthill I. C., Partridge J. C., Lunau K. Ultraviolet plumage colors predict mate preferences in starlings. Proc Natl Acad Sci U S A. 1997 Aug 5;94(16):8618–8621. doi: 10.1073/pnas.94.16.8618. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Douglas H. D., 3rd, Co J. E., Jones T. H., Conner W. E. Heteropteran chemical repellents identified in the citrus odor of a seabird (crested auklet: Aethia cristatella): evolutionary convergence in chemical ecology. Naturwissenschaften. 2001 Aug;88(8):330–332. doi: 10.1007/s001140100236. [DOI] [PubMed] [Google Scholar]
- Fluck E., Hogg S., Mabbutt P. S., File S. E. Behavioural and neurochemical responses of male and female chicks to cat odour. Pharmacol Biochem Behav. 1996 May;54(1):85–91. doi: 10.1016/0091-3057(95)02170-1. [DOI] [PubMed] [Google Scholar]
- Grubb T. C., Jr Olfactory navigation to the nesting burrow in Leach's petrel (oceanodroma leucorrhoa). Anim Behav. 1974 Feb;22(1):192–202. doi: 10.1016/s0003-3472(74)80069-2. [DOI] [PubMed] [Google Scholar]
- Jones R. B., Gentle M. J. Olfaction and behavioral modification in domestic chicks (Gallus domesticus). Physiol Behav. 1985 Jun;34(6):917–924. doi: 10.1016/0031-9384(85)90014-9. [DOI] [PubMed] [Google Scholar]
- KARLSON P., LUSCHER M. Pheromones': a new term for a class of biologically active substances. Nature. 1959 Jan 3;183(4653):55–56. doi: 10.1038/183055a0. [DOI] [PubMed] [Google Scholar]
- Meredith M. Human vomeronasal organ function: a critical review of best and worst cases. Chem Senses. 2001 May;26(4):433–445. doi: 10.1093/chemse/26.4.433. [DOI] [PubMed] [Google Scholar]
- Rasmussen L. E. Source and cyclic release pattern of (Z)-7-dodecenyl acetate, the pre-ovulatory pheromone of the female Asian elephant. Chem Senses. 2001 Jul;26(6):611–623. doi: 10.1093/chemse/26.6.611. [DOI] [PubMed] [Google Scholar]
- Walker J. C., Walker D. B., Tambiah C. R., Gilmore K. S. Olfactory and nonolfactory odor detection in pigeons: elucidation by a cardiac acceleration paradigm. Physiol Behav. 1986 Oct;38(4):575–580. doi: 10.1016/0031-9384(86)90428-2. [DOI] [PubMed] [Google Scholar]
- Wenzel B. M. Olfactory sensation in the kiwi and other birds. Ann N Y Acad Sci. 1971 Dec 3;188:183–193. doi: 10.1111/j.1749-6632.1971.tb13097.x. [DOI] [PubMed] [Google Scholar]