Plumage colour acquisition and behaviour are associated with androgens in a phenotypically plastic tropical bird

@article{Lindsay2009PlumageCA,
  title={Plumage colour acquisition and behaviour are associated with androgens in a phenotypically plastic tropical bird},
  author={Willow R. Lindsay and Michael S. Webster and Claire W. Varian and Hubert Schwabl},
  journal={Animal Behaviour},
  year={2009},
  volume={77},
  pages={1525-1532}
}

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References

SHOWING 1-10 OF 90 REFERENCES

Plumage color and reproduction in the red-backed fairy-wren: Why be a dull breeder?

TLDR
The results suggest that males may not reap any fitness benefits by breeding in dull coloration, compared with breeding in bright plumage, but rather may be constrained to breed in suboptimal plumage by the timing of plumage acquisition.

Testosterone is involved in acquisition and maintenance of sexually selected male plumage in superb fairy-wrens, Malurus cyaneus

TLDR
The evidence suggests that development of the nuptial plumage is testosterone dependent, although it cannot exclude that testosterone exerts its action after conversion to a metabolite such as oestrogen.

The effects of delayed plumage maturation on aggression and survival in male red-backed fairy-wrens

TLDR
The hypothesis that DPM is related to increased male survival in the red-backed fairy-wren via either female mimicry or status signaling is tested, indicating that male plumage coloration signals social status but that dull plumage does not afford a net survival advantage, perhaps because plumagecolor is a conditional strategy.

The effects of elevated testosterone on plumage hue in male House Finches

TLDR
In captive male House Finches elevated testosterone delayed molt and resulted in drabber, less red plumage, even when birds were supplemented with dietary carotenoids, while wild males implanted with testosterone showed wide variation in expression of plumage coloration.

COSTS AND BENEFITS OF VARIABLE BREEDING PLUMAGE IN THE RED‐BACKED FAIRY‐WREN

  • J. Karubian
  • Biology
    Evolution; international journal of organic evolution
  • 2002
TLDR
Although it appears that bright plumage increases access to higher quality mates, age also plays a central role in determining a male's overall reproductive success because of the high levels of sexual promiscuity exhibited by the red‐backed fairy‐wren.

Age-dependent association between testosterone and crown UV coloration in male blue tits (Parus caeruleus)

The proximate basis of sexual traits can suggest mechanisms maintaining honesty in signalling. A central role hereby has been attributed to testosterone, although its importance for brightly coloured

Testosterone and melanin-based black plumage coloration: a comparative study

TLDR
This study is the first to test and support the T-regulation hypothesis interspecifically, suggesting that among-species differences in melanization may have evolved in response to differences in circulating T in certain avian taxa.

Plumage coloration is a sexually selected indicator of male quality

TLDR
Results of field studies indicate that females prefer to mate with colourful males and that plumage brightness correlates with a male's capactity for parental care and perhaps its genotypic quality.

Condition-dependent sexual traits and social dominance in the house finch

TLDR
It is found that, as predicted, testosterone elevation increased dominance rank in captive males, but in free-living males, testosterone levels were higher in redder males, suggesting that testosterone is dissociated from dominance status under natural circumstances.
...