Fitness consequences of spousal relatedness in 46 small-scale societies

Biology letters Vol/Iss. 10(5) The Royal Society Published In Pages: 1-4
By Bailey, Drew H., Hill, Kim R., Walker, Robert S.


There will be a stronger negative relationship between spousal relatedness and offspring fitness among foragers than among non-foragers. (2)


Spousal relatedness was found to be positively associated with fitness outcomes among non-foragers, but negatively associated with fitness among foragers. However, when society-level inbreeding was introduced into the model, the effect was found to be accounted for by high society-level inbreeding, rather than a lack of foraging.


Test NameSupportSignificanceCoefficientTail
Mixed-Effect RegressionPartially supportedp < 0.01UNKNOWNUNKNOWN