Divorce and extra-pair paternity in the Lundy house sparrows

The question of why socially monogamous females engage in extra-pair behaviour is long-standing in evolutionary biology. Due to a lack of empirical support among passerine birds, recent work has moved away from the indirect-benefits hypothesis to explain extra-pair mating behaviour by females, instead favouring the hypothesis that this is the result of a pleiotropic effect. That is, a trait under strong positive selection in either or both sexes are genetically linked with another, potentially unrelated, trait. For example, genes beneficial to female fecundity (that promote within-pair solicitation of mating from a male partner) might also lead to extra-pair behaviour (by also promoting solicited copulations from extra-pair males).  Here, we test two predictions from this hypothesis: We test the prediction that female divorce, measured as the number of social mates within a given year, is linked with (1) the number of extra-pair males engaged by the female and (2) the proportion of the ..., , , # Divorce\_EPP\_data

[https://doi.org/10.5061/dryad.8pk0p2ntx](https://doi.org/10.5061/dryad.8pk0p2ntx)

Data contains tables from the Lundy Sparrow Project long-term database which were used to answer questions relating to frequent mate-switching (divorce) and extra-pair paternity. I have also included permutation outputs (which were lengthy) and code files.

## Description of the data and file structure

LH\_rep is a table of sparrow life history and should be explanatory from the headings - includes information on codes and identifiers used to ID the sparrows and life history traits (when they hatched, and fledged).
Nest\_Loc\_Pedigree\_rep is a table relating the the genetic pedigree of the sparrows used in our analysis and again has full column titles - Dam, Social farther and Cohort.
Suv just denotes if a bird had survived up to specific years. More information can be found in the manuscript
I have also attached two long simulation data files, and an R script showing how they wer...