Parental investment, sexual selection and sex ratios
- H. Kokko, M. Jennions
- BiologyJournal of Evolutionary Biology
- 1 July 2008
An integrative model shows how factors interact to generate sex roles and underscores the need to distinguish between the ASR and the operational sex ratio (OSR) if mortality is higher when caring than competing this diminishes the likelihood of sex role divergence.
Competition for early arrival in migratory birds
- H. Kokko
- Economics
- 1 September 1999
Summary
1. It is widely accepted that the arrival order of migratory birds is correlated with the condition of the birds, which leads to high quality individuals occupying prime sites. However,…
The evolution of mate choice and mating biases
- H. Kokko, R. Brooks, M. Jennions, J. Morley
- Biology, PsychologyProceedings of the Royal Society of London…
- 22 March 2003
It is argued that progress in understanding the evolution of mate choice is currently hampered by spurious distinctions among models and a misguided tendency to test the processes underlying each model as mutually exclusive alternatives.
Lonely hearts or sex in the city? Density-dependent effects in mating systems
Considering density-dependent selection may be essential for understanding how populations can persist at all despite sexual conflict, but simple models seem to fail to predict the diversity of observed responses in nature.
WHEN NOT TO AVOID INBREEDING
A model that derives expected values of inbreeding tolerance, that is, the magnitude of in breeding depression that is required to make individuals avoid inbreeding, for different animal life histories and parental investment patterns is developed.
The evolution of cooperative breeding through group augmentation
- H. Kokko, R. Johnstone, Clutton-Brock T. H.
- BiologyProceedings of the Royal Society of London…
- 22 January 2001
The results show that group augmentation (either passive or active) can be evolutionarily stable and explain costly helping by non–reproductive subordinates, either alone or leading to elevated help levels when acting in concert with kin selection.
Unifying and Testing Models of Sexual Selection
- H. Kokko, M. Jennions, R. Brooks
- Biology, Psychology
- 7 November 2006
This work reviews evolutionary explanations for the relationship between anisogamy, potential reproductive rates, parental care, sex roles, and mate choice, and considers other forms of selection that can make females mate nonrandomly.
The sexual selection continuum
- H. Kokko, R. Brooks, J. McNamara, A. Houston
- BiologyProceedings of the Royal Society of London…
- 7 July 2002
A general model of female choice for indirect benefits that captures the essence of both the ‘Fisherian’ and ‘good genes’ models is built and all versions of the model point to a single process that favours female preference for males siring offspring of high reproductive value.
Bet‐hedging—a triple trade‐off between means, variances and correlations
- J. Starrfelt, H. Kokko
- BiologyBiological Reviews of The Cambridge Philosophical…
- 1 August 2012
A general model is presented showing how evolutionary changes are affected by variance in fitness and how genotypic fitness variance can be separated into variance in Fitness at the level of the individuals and correlations in fitness among them, and it is shown that this division can be considered a false dichotomy.
Evolutionarily stable strategies of age-dependent sexual advertisement
- H. Kokko
- EconomicsBehavioral Ecology and Sociobiology
- 6 August 1997
The model shows that an increase in the expression of the sexually selected trait over several years is an evolutionarily stable strategy under a wide range of situations, so that a correlated preference for old age can emerge through a viability indicator mechanism.
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