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RESEARCH ARTICLE
Contents Vol 107(3)

Skewed paternity distribution in the extremely size dimorphic Musk Duck (Biziura lobata)

P.-J. Guay A B and R. A. Mulder A
+ Author Affiliations
- Author Affiliations

A Department of Zoology, University of Melbourne, Parkville, Vic. 3010, Australia.

B Corresponding author. Email: p.guay@pgrad.unimelb.edu.au

Emu 107(3) 190-195 https://doi.org/10.1071/MU07012
Submitted: 12 February 2007  Accepted: 10 July 2007   Published: 3 September 2007

Abstract

Although most species of Anseriformes form long-term or seasonal pair-bonds and breed monogamously, some are thought to be polygynous. The Musk Duck (Biziura lobata) is unique among Anseriformes in that it has been suggested to have a lek mating system. Musk Ducks also display extreme size dimorphism and many secondary sexual traits whose functions are not clearly understood. We studied paternity in a resident population of Musk Ducks in order to explore the genetic mating system and to investigate the role of different male secondary sexual traits. We obtained blood samples from seven males, five breeding females and seven ducklings from six broods on Lake Wendouree, Ballarat, Australia, during the 2003 breeding season and used microsatellite markers to assign paternity to ducklings. Two of the seven sampled males fathered all of the ducklings in the five broods for which we could assign paternity. Both of these males were territorial and heavier, had larger lobes and displayed more frequently than the remaining males. They also produced a large amount of musk. Our results provide the first unequivocal genetic demonstration of polygyny occurring in a wild anseriform population. Discovery of polygyny in Musk Ducks corresponds well with previous field studies suggesting that they have a lek mating system. The skewed paternity distribution towards more ornamented and larger males also suggests that these traits may have evolved under sexual selection.

Additional keywords: lek, mating system, microsatellite


Acknowledgements

This research was supported by Birds Australia, the Department of Zoology and the Faculty of Science of the University of Melbourne, le Fonds québécois de la recherche sur la nature et les technologies, the Holsworth Wildlife Research Endowment, the Australian Bird Study Association, the Royal Zoological Society of NSW, Australian Geographic and Sigma Xi. Blood samples were collected under Animal Experimentation and Ethics Committee Register 02088 and permits from the Department of Sustainability and Environment, Victoria. We thank Wouter van Dongen, Greg Adcock and Grainne Maguire for assistance in the laboratory and John Gregurke and Carol G. Hall for their help in the field. We also thank Dr Peter O. Dunn and Dr Graham Hall and the anonymous referees for comments on earlier versions of this manuscript.


References

Ardia, D. R. (2005). Super size me: an experimental test of the factors affecting lipid content and the ability of residual body mass to predict lipid stores in nestling European Starlings. Functional Ecology 19, 414–420.
| Crossref | GoogleScholarGoogle Scholar | Black J. M. (2005). Ecology of social behaviour. In ‘Ducks, Geese and Swans’. (Ed. J. Kear.) pp. 57–67. (Oxford University Press: New York.)

Bowler J. (2005). Breeding strategies and biology. In ‘Ducks, Geese and Swans’. (Ed. J. Kear.) pp. 68–111. (Oxford University Press: New York.)

Braithwaite, L. W. , and Frith, H. J. (1969). Waterfowl in an inland swamp in New South Wales. III. Breeding. CSIRO Wildlife Research 14, 65–109.
Bruford M. W., Hanotte O., Brookfield J. F. Y., and Burke T. (1992). Single locus and multi-locus fingerprinting. In ‘Molecular Genetics Analysis of Population – A Molecular Approach’. (Ed. A. R. Hoelzel.) pp. 227–229. (IRL Press: Oxford, UK.)

Coker, C. R. , McKinney, F. , Hays, H. , Briggs, S. V. , and Cheng, K. M. (2002). Intromittent organ morphology and testis size in relation to mating system in waterfowl. Auk 119, 403–413.
| Crossref | GoogleScholarGoogle Scholar | Frith H. J. (1967). ‘Waterfowl in Australia.’ (Angus and Robertson: Sydney.)

Frith, H. J. , and Davis, S. J. J. F. (1961). Ecology of the Magpie Goose, Anseranas semipalmata Latham (Anatidae). CSIRO Wildlife Research 6, 91–141.
Fullagar P., Davey C., Shepherd P., and Peters C. (2005). Freckled Duck Stictonetta naevosa. In ‘Ducks, Geese and Swans’. (Ed. J. Kear.) pp. 339–343. (Oxford University Press: New York.)

Gamble K. E. (1966). Breeding biology and food habits of the Musk Duck (Biziura lobata). M.Sc. Thesis, University of Wisconsin, Madison, USA.

Goudet J. (2001). ‘FSTAT: A Program to Estimate and Test Gene Diversities and Fixation Indices, Version 2.9.3.’ Available from http://www2.unil.ch/popgen/softwares/fstat.htm/ [Verified 7 August 2007].

Green, A. J. (2001). Mass/length residuals: measures of body condition or generators of spurious results? Ecology 82, 1473–1483.
Höglund J., and Alatalo R. V. (1995). ‘Leks.’ (Princeton University Press: Princeton.)

Horrock N. (2005). Plasticity of ornament size in the Mute Swan Cygnus olor: evidence for a sexually selected trait? M.Sc. Thesis, Oxford University, Oxford, UK.

Johnsgard, P. A. (1961). Breeding biology of the Magpie Goose Annual Report of the Wildfowl Trust 12, 92–103.
Johnsgard P. A., and Carbonell M. (1996). ‘Ruddy Ducks and Other Stifftails: Their Behavior and Biology.’ (University of Oklahoma Press: Norman, OK.)

Jones, I. L. , Hagelin, J. C. , Major, H. L. , and Rasmussen, L. E. L. (2004). An experimental field study of the function of Crested Auklet feather odor. Condor 106, 71–78.
| Crossref | GoogleScholarGoogle Scholar | Kear J. (1970). The adaptative radiation of parental care in waterfowl. In ‘Social Behaviour in Birds and Mammals’. (Ed. J. H. Crook.) pp. 357–392. (Academic Press: London.)

Kraaijeveld, K. , Carew, P. J. , Billing, T. , Adcock, G. J. , and Mulder, R. A. (2004a). Extra-pair paternity does not result in differential sexual selection in the mutually ornamented black swan (Cygnus atratus). Molecular Ecology 13, 1625–1633.
| Crossref | GoogleScholarGoogle Scholar | PubMed | Marchant S., and Higgins P. J. (Eds) (1990). ‘Handbook of Australian, New Zealand, and Antarctic Birds. Vol. 1: Ratites to Ducks.’ (Oxford University Press: Melbourne.)

McCracken K. G. (1999). Systematics, ecology, and social biology of the Musk Duck (Biziura lobata) of Australia. Ph.D. Thesis, Louisiana State University, Baton Rouge, USA.

McCracken, K. G. , Afton, A. D. , and Paton, D. C. (2000a). Nest and eggs of Musk Ducks Biziura lobata at Murray Lagoon, Cape Gantheaume Conservation Park, Kangaroo Island, South Australia. South Australian Ornithologist 33, 65–70.
Rees E. C., Lievesley P., Pettifor R. A., and Perrins C. (1996). Mate fidelity in swans: an interspecific comparison. In ‘Partnerships in Birds: The Study of Monogamy’. (Ed. J. M. Black.) pp. 118–137. (Oxford University Press: Oxford.)

Roper, T. J. (1999). Olfaction in birds. Advances in the Study of Behavior 28, 247–332.
Todd F. S. (1979). ‘Waterfowl: Ducks, Geese and Swans of the World.’ (Sea World Press: San Diego.)

Triggs, S. , Williams, M. , Marshall, S. , and Chambers, G. (1991). Genetic relationships within a population of blue ducks Hymenolaimus malacorhynchos. Wildfowl 42, 87–93.
Young G. (2005). African Comb Duck Sarkidiornis melanotos. In ‘Ducks, Geese and Swans’. (Ed. J. Kear.) pp. 391–393. (Oxford University Press: New York.)