Female guppies increase their propensity for polyandry as an inbreeding avoidance strategy

Speechley, Elizabeth M.; Gasparini, Clelia; Evans, Jonathan P.

doi:10.1016/j.anbehav.2019.08.016

Cited by 6 publications

(2 citation statements)

References 58 publications

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“…Finally, mountain gorillas could also rely on postcopulatory mechanisms for inbreeding avoidance which could result in few offspring being born as a result of inbreeding even if mating between relatives remains common. However, despite the breadth of studies on inbreeding avoidance through mate choice in primates, far less is known about post-copulatory inbreeding avoidance, which has more commonly been studied in birds, fish and arthropods [22,[65][66][67].…”

Section: Introductionmentioning

confidence: 99%

Multiple mechanisms for inbreeding avoidance used simultaneously in a wild ape

Morrison,

Ndayishimiye,

Stoinski

et al. 2023

Proc. R. Soc. B.

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Mating with close kin can have considerable negative fitness consequences, which are expected to result in selective pressure for inbreeding avoidance mechanisms, such as dispersal, mate choice and post-copulatory biases. Captive studies have suggested that inbreeding avoidance through mate choice is far less widespread than expected and may be absent where other mechanisms already limit inbreeding. However, few studies have examined multiple mechanisms of inbreeding avoidance simultaneously, particularly in the wild. We use 13 years of detailed dispersal, copulation and paternity data from mountain gorillas to examine inbreeding avoidance. We find that partial dispersal of both sexes results in high kinship in multimale groups, but that copulations between close kin occur 40% less than expected. We find strong kin discrimination in mate choice, with significant avoidance of maternal kin but more limited avoidance of paternal kin. We find no evidence for post-copulatory inbreeding avoidance. Our analyses support familiarity-based mechanisms of kin identification and age-based avoidance that limits mating between fathers and daughters in their natal group. Our findings demonstrate that multiple complementary mechanisms for inbreeding avoidance can evolve in a single species and suggest that inbreeding avoidance through mate choice may enable more flexible dispersal systems to evolve.

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Section: Introductionmentioning

confidence: 99%

Multiple mechanisms for inbreeding avoidance used simultaneously in a wild ape

Morrison,

Ndayishimiye,

Stoinski

et al. 2023

Proc. R. Soc. B.

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“…Furthermore, polyandrous mating behaviour, i.e. increased matings, of female guppies following matings with brothers is described as postcopulatory inbreeding avoidance mechanism and may minimise inbreeding through a dilution effect [ 32 , 33 ]. To note, the generality of inbreeding avoidance has been questioned and recently it was settled that this phenomenon is rare even in animals [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Sex-specific effects of inbreeding on body colouration and physiological colour change in the cichlid fish Pelvicachromis taeniatus

2022

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Background Colour expression is highly variable in animals. In fishes, rapid colour change, i.e. physiological colour change, can be observed in multiple contexts, e.g. in camouflage or communication, and is affected by various factors, such as stress. Pelvicachromis taeniatus is a cichlid fish from West Africa with sexual dichromatism and both sexes being brightly coloured and flexible in ornament expression. In the present study, inbred and outbred P. taeniatus were photographed before and after a stress situation to investigate the stress response regarding colour expression in both sexes. Results The chromaticity and the colour patch size (relative coloured area at the abdomen) were determined at both timepoints and the changes were analysed. Additionally, the coefficients of variation within family groups for the chromaticity (CVchromaticity) and colour patch size (CVarea) were calculated. Chromaticity as well as the extent of colouration increased significantly following handling stress. The change in chromaticity was not significantly different between in- and outbred individuals in females and males. Inbred males showed more intense yellow colouration than outbred males. Independent from inbreeding, the CVchromaticity decreased following the handling stress. The change in CVarea of females and males differed between in- and outbred individuals. In females, the decrease was significantly stronger in inbred individuals and in males the decrease was stronger in the outbred group. Conclusion The results show that short-term stress can increase colouration, potentially advertising individual’s stress tolerance. Furthermore, this study shows positive inbreeding effects on a sexually selected trait.

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A taste for the familiar: explaining the inbreeding paradox

Dorsey¹,

Rosenthal²

2023

Trends in Ecology & Evolution

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Female guppies increase their propensity for polyandry as an inbreeding avoidance strategy

Cited by 6 publications

References 58 publications

Multiple mechanisms for inbreeding avoidance used simultaneously in a wild ape

Multiple mechanisms for inbreeding avoidance used simultaneously in a wild ape

Sex-specific effects of inbreeding on body colouration and physiological colour change in the cichlid fish Pelvicachromis taeniatus

A taste for the familiar: explaining the inbreeding paradox

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