• Publications
  • Influence
Parental investment, sexual selection and sex ratios
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. Expand
The evolution of mate choice and mating biases
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. Expand
Competition for early arrival in migratory birds
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,Expand
Lonely hearts or sex in the city? Density-dependent effects in mating systems
  • H. Kokko, D. Rankin
  • Biology, Medicine
  • Philosophical Transactions of the Royal Society B…
  • 28 February 2006
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. Expand
  • H. Kokko, I. Ots
  • Biology, Medicine
  • Evolution; international journal of organic…
  • 1 March 2006
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. Expand
The evolution of cooperative breeding through group augmentation
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. Expand
Unifying and Testing Models of Sexual Selection
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. Expand
The sexual selection continuum
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. Expand
Evolutionarily stable strategies of age-dependent sexual advertisement
  • H. Kokko
  • Biology
  • Behavioral 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. Expand
Bet‐hedging—a triple trade‐off between means, variances and correlations
  • J. Starrfelt, H. Kokko
  • Biology, Medicine
  • Biological 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. Expand