Ultraviolet colour variation influences blue tit sex ratios
- B. Sheldon, S. Andersson, S. Griffith, J. Örnborg, J. Sendecka
- BiologyNature
- 23 December 1999
Experimental evidence that females skew the sex ratio of their offspring in response to the ultraviolet plumage ornamentation of their mates is reported, suggesting that chromosomal sex determination may not constrain the sex ratios of multiparous vertebrates.
Ultraviolet sexual dimorphism and assortative mating in blue tits
- S. Andersson, J. Örnborg, M. Andersson
- BiologyProceedings of the Royal Society of London…
- 22 March 1998
It is concluded that blue tits are markedly sex dimorphic in their own visual world, and that UV/violet coloration probably plays a role in blue tit mate acquisition.
Multiple Receivers, Multiple Ornaments, and a Trade‐off between Agonistic and Epigamic Signaling in a Widowbird
- S. Andersson, S. Pryke, J. Örnborg, M. Lawes, M. Andersson
- BiologyAmerican Naturalist
- 1 November 2002
It is proposed that the “multiple receiver hypothesis” can explain the coexistence of multiple handicap signals, and the trade‐off between signal expressions might contribute to the inverse relation between nuptial tail elongation and coloration in the genus Euplectes (bishops and widowbirds).
Agonistic carotenoid signalling in male red-collared widowbirds: aggression related to the colour signal of both the territory owner and model intruder
- S. Pryke, M. Lawes, S. Andersson
- Environmental ScienceAnimal Behaviour
- 1 October 2001
It is shown that sexually dimorphic carotenoid ornamentation functions as an agonistic signal in male red-collared widowbirds, Euplectes ardens, suggesting that the nuptial carotanoid coloration is an honest signal of dominance or fighting ability, sexually selected through male contest competition over territories.
Paternity analysis reveals opposing selection pressures on crown coloration in the blue tit (Parus caeruleus)
- K. Delhey, A. Johnsen, A. Peters, S. Andersson, B. Kempenaers
- BiologyProceedings of the Royal Society of London…
- 7 October 2003
It is shown that males with a more UV–shifted crown hue were less cuckolded, which probably resulted from female preference for more ornamented mates, and two alternative male mating tactics, where more UV-ornamented males maximize within–pair success and less UV–ornamente males maximize extra-pair success.
Ultraviolet plumage ornamentation affects social mate choice and sperm competition in bluethroats (Aves: Luscinia s. svecica): a field experiment
- A. Johnsen, S. Andersson, J. Örnborg, J. Lifjeld
- BiologyProceedings of the Royal Society of London…
- 22 July 1998
This work reports the first experimental evidence that UV signalling influences male mating success in free–ranging birds, and concludes that the treatment affected both social and extra–pair mate choice.
Seasonal changes in a ultraviolet structural colour signal in blue tits, Parus caeruleus
- J. Örnborg, J. Örnborg, S. Andersson, S. Griffith, B. Sheldon
- Biology
- 1 June 2002
It is suggested that it is important to consider plumage age when exploring variation in structural plumage coloration, and that it can largely explain the difference between the British and Swedish studies.
Female blue tits adjust parental effort to manipulated male UV attractiveness
- T. Limbourg, A. C. Mateman, S. Andersson, C. M. Lessells
- BiologyProceedings of the Royal Society of London…
- 22 September 2004
It is concluded that blue tit females use male UV coloration as an indicator of expected offspring fitness and adjust their investment accordingly, while males reduce parental feeding rates and this reduces the skeletal growth of offspring.
Red Carotenoid Coloration in the Zebra Finch Is Controlled by a Cytochrome P450 Gene Cluster
- N. Mundy, J. Stapley, J. Slate
- BiologyCurrent Biology
- 6 June 2016
Ultraviolet colour vision and ornamentation in bluethroats
- S. Andersson, T. Amundsen
- BiologyProceedings of the Royal Society of London…
- 22 November 1997
In 13 of the 16 trials, the female associated most with the NR male, a preference that implies that UV colour vision is used in mate choice by female bluethroats, suggestive of a UV colour cue in age–related mate preferences.
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