Abstract
In many animal species, cognitive abilities are under strong natural selection because decisions about foraging, habitat choice and predator avoidance affect fecundity and survival. But how has sexual selection, which is usually stronger on males than females, shaped the evolution of cognitive abilities that influence success when competing for mates or fertilizations? We aimed to investigate potential links between individual differences in male cognitive performance to variation in paternity arising solely from sexual selection. We therefore ran four standard cognitive assays to quantify five measures of cognitive performance by male mosquitofish (Gambusia holbrooki). Males were then assigned to 11 outdoor ponds where they could compete for females. Females mate many times, which leads to intense sperm competition and broods with mixed paternity. We genotyped 2,430 offspring to identify their fathers. Males with greater inhibitory control and better spatial learning abilities sired significantly more offspring, while males with better initial impulse control sired significantly fewer offspring. Associative and reversal learning did not predict a male’s share of paternity. In sum, there was sexual selection on several, but not all, aspects of male cognitive performance.
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Data availability
The data that support the findings of this study are available via figshare at https://figshare.com/s/4cc0aeaa01188668c0e7 (ref. 114).
Code availability
The R code is available via figshare at https://figshare.com/s/4cc0aeaa01188668c0e7 (ref. 114).
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Acknowledgements
We thank the ANU Animal Services staff, U. Aich, M.-H. Chung and L. Harrison for assistance with fish husbandry. We thank T. Neeman for assistance with statistical analysis. We thank the Australian Research Council (DP2019100279) and the German Primate Centre for funding. We extend special thanks to A. Kilian from DaRT for providing genotyping services at a generously discounted rate.
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All authors conceived and designed the study. I.M.V. and R.J.F. collected and analysed the data. All authors interpreted the data, co-wrote the paper and gave permission for publication.
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Extended data
Extended Data Fig. 1 Null PCA distributions calculated from 10 000 simulated data sets using PCAtest package in R120 and empirical statistics from measurements of cognitive abilities in mosquitofish (n = 63).
Grey and red points represent random permutations and mean observed values, respectively, with error-bars showing 95% confidence intervals (CI).
Extended Data Fig. 2 Linear relationship between principal component 1 (PC1) and the composite cognitive score (CCS) for cognitive measures in male mosquitofish Gambusia holbrooki.
CCS was calculated as the mean of the standardised values for spatial learning, associative learning, reversal learning, and a standardised combined mean of inhibitory control and initial impulse time.
Extended Data Fig. 3 Histogram of the number of offspring sired per male (A) and produced per female (B) by mosquitofish Gambusia holbrooki in 11 mating ponds.
Each pond initially had 7-11 males and an equal number of virgin females.
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Vinogradov, I.M., Fox, R.J., Fichtel, C. et al. Paternity analysis reveals sexual selection on cognitive performance in mosquitofish. Nat Ecol Evol 9, 692–704 (2025). https://doi.org/10.1038/s41559-025-02645-3
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DOI: https://doi.org/10.1038/s41559-025-02645-3
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