Good genes |
Extra-pair partners that signal a greater genetic
proposition than the social male is sought to provide indirect benefits
to her offspring |
(Hamilton and Zuk 1982; Birkhead 1995) |
Fertility insurance |
Extra-pair copulations are sought to protect
against infertility in her own social partner, with or without phenotype
cues |
(Wetton and Parkin 1991; Sheldon 1994; Vedder
2022) |
Sociality as a mediator of variation in extra-pair behaviour |
The
social environment provides a mechanism for extra-pair behaviour through
increased mate-choice. |
(Maldonado-Chaparro et al. 2018) |
Intersexual antagonistic pleiotropy |
Non adaptive female extra-pair
mating derived of alleles where the cost of extra-pair behaviour to
females is small relative to the benefit to males. |
(Halliday and
Arnold 1987; Forstmeier et al. 2014; Wang et al. 2020) |
Intrasexual antagonistic pleiotropy |
Female extra-pair behaviour is
derived of alleles traits beneficial to female fecundity, for example
solicitation of social partners (considered here). |
(Forstmeier et al.
2014; Wang et al. 2020) |