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Behavioral Ecology and Sociobiology

, Volume 29, Issue 6, pp 421–427 | Cite as

An experimental study of male adornment in the scarlet-tufted malachite sunbird: II. The role of the elongated tail in mate choice and experimental evidence for a handicap

  • Matthew R. Evans
  • B. J. Hatchwell
Article

Summary

Scarlet-tufted malachite sunbirds (Neetarinia johnstoni) are endemic to the high altitude zones of East African mountains. On Mount Kenya the males are resident and territorial all year. The females arrive over an extended period at the beginning of the breeding season, after spending the non-breeding season in nomadic flocks at slightly lower elevations. Males are bright iridescent green with elongated central tail feathers, which are displayed during courtship. We examined the role of the tail in mate choice using natural variation and investigated the influence of tail length on male time budgets by experimental manipulation. Territorial males that paired had longer tails than territorial males which remained unpaired. Males with naturally long tails started breeding earlier, resulting in fledglings being produced earlier in the season when the weather was more clement. Birds which bred together in one year were paired together in the next year if they both survived. Thus the male's tail may only be involved as a cue in the formation of new pairs. Males which were already paired were subjected to one of three experimental treatments — having their tail elongated, shortened, or manipulated but kept at the same length. Males with experimentally shortened tails spent more time in flight and hawked for flying insects with a higher efficiency than control males. Both control and elongated tail males reduced the amount of time in flight and had a lower hawking efficiency after manipulation. These results suggest that the long tail of male scarlet-tufted malachite sunbirds is a handicap. The factors influencing the reproductive success of a pair are discussed.

Keywords

Reproductive Success Breeding Season Mate Choice Malachite Tail Length 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Alatalo RV, Lundberg A, Glynn C (1986) Female pied flycatchers choose territory quality and not male characteristics. Nature 323:152–153Google Scholar
  2. Andersson M (1982a) Female choice selects for extreme tail length in a widowbird. Nature 299:818–820Google Scholar
  3. Andersson M (1982b) Sexual selection, natural selection and quality advertisement. Biol J Linn Soc 17:375–393Google Scholar
  4. Butcher GS, Rohwer S (1989) The evolution of conspicuous and distinctive coloration for communication in birds. In: Power DM (ed) Current Ornithology, vol 6. Plenum Press, New York, London, pp 51–108Google Scholar
  5. Coe MJ (1967) The ecology of the alpine zone of Mount Kenya. Junk, The HagueGoogle Scholar
  6. Evans MR (in press) The size of male adornments in the scarlet-tufted malachite sunbird vary with environmental conditions. Anim BehavGoogle Scholar
  7. Evans MR, Hatchwell BJ (1991) An experimental study of male adornment in the scarlet-tufted malachite sunbird: I. The role of the pectoral tufts in territorial defence. Behav Ecol Sociobiol 29:413–419Google Scholar
  8. Evans MR, Thomas ALR (in press) The aerodynamic and mechanical effects of elongated tails in the scarlet-tufted malachite sunbird: measuring the cost of a handicap. Anim BehavGoogle Scholar
  9. Fisher RA (1930) The genetical theory of natural selection. Clarendon Press, OxfordGoogle Scholar
  10. Grafen A (1990a) Sexual selection unhandicapped by the Fisher process. J Theor Biol 144:473–516Google Scholar
  11. Grafen A (1990b) Biological signals as handicaps. J Theor Biol 144:517–546PubMedGoogle Scholar
  12. Halliday TR (1983) The study of mate choice. In: Bateson P (ed) Mate choice. Cambridge University Press, CambridgeGoogle Scholar
  13. Lande R (1981) Models of speciation by sexual selection on poylgenic traits. Proc Nat Acad Sci USA 78:3721–3725Google Scholar
  14. Møller AP (1988) Female choice selects for male sexual tail ornaments in the monogamous swallow. Nature 332:640–642Google Scholar
  15. Møller AP (1989) Viability costs of male tail ornaments in a swallow. Nature 339:132–135Google Scholar
  16. Møller AP (1990) Male tail length and female mate choice in the monogamous swallow Hirondo rustica. Anim Behav 39:458–465Google Scholar
  17. Myers JP, Conners PG, Pitelka FA (1981) Optimal territory size and the sanderling: compromises in a variable environment. In: Kamil AC, Sargent TD (eds) Foraging behaviour: ecological, ethological and psychological approaches. Garland STPM Press, New York, pp 135–158Google Scholar
  18. Norris KJ (1990) Female choice and the evolution of the cpnspicuous pluamge colouration of monogamous male great tits. Behav Ecol Sociobiol 26:129–138Google Scholar
  19. O'Donald P (1980) Genetic models of sexual selection. Cambridge University Press, CambridgeGoogle Scholar
  20. Partridge L, Harvey P (1986) Contentious issues in sexual selection. Nature 323:580–581Google Scholar
  21. Tyler S (1979) Time-sampling: a matter of convention. Anim Behav 27:801–810Google Scholar
  22. Perrins CM (1965) Population fluctuations and clutch size in the great tit Parus major L. J Anim Ecol 34:601–647Google Scholar
  23. Van Noordwijk AJ, van Balen JH, Scharloo W (1980) Heritability of ecologically important traits in the great tit. Ardea 68:193–203Google Scholar
  24. Williams JG (1951) Nectarina johnstoni: a revision of the species together with data on plumages, moults and habits. Ibis 93:579–595Google Scholar
  25. Zahavi A (1975) Mate selection — a selection for a handicap. J Theor Biol 53:205–214PubMedGoogle Scholar
  26. Zahavi A (1977) The cost of honesty (Further remarks on the handicap principle). J Theor Biol 67:603–605Google Scholar

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Matthew R. Evans
    • 1
  • B. J. Hatchwell
    • 1
  1. 1.Department of ZoologyUniversity of CambridgeCambridgeUK

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