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Sex and death: CHD1Z associated with high mortality in moorhens

Lee, Patricia L.M., Brain, Paul F., Forman, Dan W., Bradbury, Richard B. and Griffiths, Richard 2002, Sex and death: CHD1Z associated with high mortality in moorhens, Evolution, vol. 56, no. 12, pp. 2548-2553, doi: 10.1111/j.0014-3820.2002.tb00180.x.

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Title Sex and death: CHD1Z associated with high mortality in moorhens
Author(s) Lee, Patricia L.M.ORCID iD for Lee, Patricia L.M. orcid.org/0000-0002-8489-9206
Brain, Paul F.
Forman, Dan W.
Bradbury, Richard B.
Griffiths, Richard
Journal name Evolution
Volume number 56
Issue number 12
Start page 2548
End page 2553
Total pages 6
Publisher Wiley
Place of publication London, England
Publication date 2002-12
ISSN 0014-3820
1558-5646
Keyword(s) Gallinula chloropus
genetic incompatibility
maternal effects
sex chromosomes
sex ratios
underdominance
Summary Sex ratios in clutches of moorhens (Gallinula chloropus) in Britain were measured on 83 chicks using the sex-linked CHD1 gene (Chromo-helicase/ATPase-DNA binding protein 1). Among birds, the female is the hetero-gametic sex (Z and W chromosomes), and the male is homogametic (two copies of the Z chromosome). We report variation among the PCR-amplified fragments of the CHD1Z, and the death of nearly all heterozygous male chicks (92%). In contrast, survivorship among females and homozygote males was 54–60%. Mortality in male heterozygotes was significantly higher than that of male homozygotes (P < 0.001). Chick and egg biometrics were not significantly different between these males. The CHD1Z was unlikely to be directly responsible but may have been hitchhiked by the causal gene(s). The observations appear to follow a classic underdominance (heterozygote inferiority) pattern, but raise the paradoxical question of why one form of the Z chromosome has not been fixed, as is expected from evolutionary theory. We discuss possible explanations and include a survey of British populations based on skin specimens.
Language eng
DOI 10.1111/j.0014-3820.2002.tb00180.x
Field of Research 060411 Population, Ecological and Evolutionary Genetics
060399 Evolutionary Biology not elsewhere classified
060208 Terrestrial Ecology
Socio Economic Objective 960899 Flora, Fauna and Biodiversity of Environments not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2002, Wiley
Persistent URL http://hdl.handle.net/10536/DRO/DU:30056224

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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