Data from: Pedigree error due to extra-pair reproduction substantially biases estimates of inbreeding depression

Understanding the evolutionary dynamics of inbreeding and inbreeding
depression requires unbiased estimation of inbreeding depression across
diverse mating systems. However, studies estimating inbreeding depression
often measure inbreeding with error, for example, based on pedigree data
derived from observed parental behavior that ignore paternity error
stemming from multiple mating. Such paternity error causes error in
estimated coefficients of inbreeding (f) and reproductive success and
could bias estimates of inbreeding depression. We used complete “apparent”
pedigree data compiled from observed parental behavior and analogous
“actual” pedigree data comprising genetic parentage to quantify effects of
paternity error stemming from extra-pair reproduction on estimates of f,
reproductive success, and inbreeding depression in free-living song
sparrows (Melospiza melodia). Paternity error caused widespread error in
estimates of f and male reproductive success, causing inbreeding
depression in male and female annual and lifetime reproductive success and
juvenile male survival to be substantially underestimated. Conversely,
inbreeding depression in adult male survival tended to be overestimated
when paternity error was ignored. Pedigree error stemming from extra-pair
reproduction therefore caused substantial and divergent bias in estimates
of inbreeding depression that could bias tests of evolutionary theories
regarding inbreeding and inbreeding depression and their links to
variation in mating system.