DOI: 10.5061/dryad.dfn2z350d
title: The contribution of extra-pair paternity to the variation in lifetime and age-specific male reproductive success in a socially monogamous species

description: In socially monogamous species, extra-pair paternity (EPP) is predicted to
 increase variance in male reproductive success beyond that resulting from
 genetic monogamy, thus increasing the ‘opportunity for selection’ (maximum
 strength of selection that can act on a trait). This prediction is
 challenging to investigate in wild populations because lifetime
 reproduction data are often incomplete. Moreover, age-specific variances
 in reproductive success have been rarely quantified. We analysed 21 years
 of near-complete social and genetic reproduction data from an insular
 population of Seychelles warblers (Acrocephalus sechellensis). We
 quantified the contribution of EPP to lifetime and age-specific
 opportunities for selection in males. We also compared the variance in
 male genetic reproductive success (RS) vs. social (‘apparent’)
 reproductive success (RSap) to assess if EPP increased the opportunity for
 selection over that resulting from genetic monogamy. EPP contributed
 substantially to the variance in lifetime RS, despite not causing a
 statistically significant excess of this over the variance in lifetime
 RSap. Partitioning the opportunity for selection into age-specific
 (co)variance components, showed that EPP provided a substantial
 contribution at most ages, varying with age. Therefore, in Seychelles
 warblers EPP likely provides an age-dependent contribution to the
 opportunity for selection, which can influence evolutionary processes in
 age-structured populations.
description: <strong>Data file
 "Lifetime_Data.xlsx": </strong>data on social and genetic
 reproductive success (and its components) in the period 1997-2018 for 237
 male Seychelles warblers born in 1997-2005 on Cousin Island
 (Seychelles). <strong>File
 tabs</strong> "Lifetime reproduction":
 data on lifetime reproduction, age of first dominance and
 longevity "Additive method": data on
 age-specific reproduction across all males (data analysed with the
 additive method of variance partitioning)
 "Independent method": data on age-specific reproducion
 across males surviving to each age (data analysed with the independent
 method of variance partitioning) "Lifetime M N
 P": data on lifetime number of mates, mate fecundity and paternity
 allocation of males that sired at least 1 within-group and 1 extra-group
 offspring in life <strong>Variables in the
 file</strong> MaleID: male identity; AgeClass:
 age class (in years; "12"= 12+); AFD: age of first dominance
 (years); Longevity: lifespan (years) EGP: extra-group
 paternity; WGP: within-group paternity; RS: reproductive success; RSap:
 apparent reproductive success LEGP: lifetime
 extra-group paternity; LWGP: lifetime within-group paternity; LRS:
 lifetime reproductive success; LRSap: lifetime apparent reproductive
 success  LMe: number of extra-group mates in life;
 LMw: number of within-group mates in life LNe: number
 of offspring per extra-group mate throughout the male's
 life LNw: number of offspring per within-group mate
 throughout the male's life LPe: proportion of
 young sired per extra-group mate throughout the male's life
 LPw: proportion of young sired per within-group mate throughout
 the male's life