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Parental care and adaptive brood sex ratio manipulation in birds.

  • Dennis Hasselquist
  • Bart Kempenaers
Publishing year: 2002
Language: English
Pages: 363-372
Publication/Series: Royal Society of London. Philosophical Transactions B. Biological Sciences
Volume: 357
Issue: 1419
Document type: Journal article review
Publisher: Royal Society

Abstract english

Under many circumstances, it might be adaptive for parents to bias the investment in offspring in relation to sex. Recently developed molecular techniques that allow sex determination of newly hatched offspring have caused a surge in studies of avian sex allocation. Whether females bias the primary brood sex ratio in relation to factors such as environmental and parental quality is debated. Progress is hampered because the mechanisms for primary sex ratio manipulation are unknown. Moreover, publication bias against non-significant results may distort our view of adaptive sex ratio manipulation. Despite this, there is recent experimental evidence for adaptive brood sex ratio manipulation in birds. Parental care is a particularly likely candidate to affect the brood sex ratio because it can have strong direct effects on the fitness of both parents and their offspring. We investigate and make predictions of factors that can be important for adaptive brood sex ratio manipulation under different patterns of parental care. We encourage correlational studies based on sufficiently large datasets to ensure high statistical power, studies identifying and experimentally altering factors with sex-differential fitness effects that may cause brood sex ratio skew, and studies that experimentally manipulate brood sex ratio and investigate fitness effects.


  • Biological Sciences


  • Molecular Ecology and Evolution Lab
  • ISSN: 1471-2970
Dennis Hasselquist
E-mail: dennis [dot] hasselquist [at] biol [dot] lu [dot] se



+46 46 222 37 08



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PhD Students, assistant supervisor


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