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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Ultraviolet colour variation influences blue tit sex ratios

Article Abstract:

Research among a wild population of blue tits, Parus caeruleus, has produced experimental evidence that females shift the sex ratio of their young in response to the ultraviolet plumage orientation of their mates. This research supports existing experimental evidence that female birds are able to control the primary sex ratio of their young, but shows an unusually high level of control. It seems that the ultraviolet colour signal itself acts as an indicator of male phenotypic quality in blue tits. This backs up other evidence indicating that this is a target of female choice.

Author: Griffith, Simon C., Sheldon, Ben C., Andersson, Staffan, Ornborg, Jonas, Sendecka, Joanna
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
Birds, Animal reproduction, Blue tit

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Environmental determination of a sexually selected trait

Article Abstract:

A population of house sparrows on Lundy island was studied between 1995 and 1996. Cross fostering experiments were used to examine the inheritance of the black throat patch of male sparrows. The results showed that non-genetic factors may be significant, and in agreement with the concept that expression of certain sexual ornaments is determined by environmental factors, or by the interaction of genetic and environmental factors.

Author: Owens, Ian P.F., Griffith, Simon C., Burke, Terry
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
Research, Sparrows, Sexual selection in animals, Sexual selection (Natural selection)

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