Legends_ProcB.txt

Assuming female-only parental investment, the (A) relationship between parental investment per offspring (<i>m</i>) and the number of identical-by-descent (IBD) copies of a focal female's alleles that are inherited by its offspring (<i>ζ<sub>off</sub></i> for females that outbreed (<i>r=0</i>; solid curve) and females that inbreed with a first order relative (<i>r=1/2</i>; dashed curve). Tangent lines identify optimal parental investment, and their slopes define a female's inclusive fitness when outbreeding (solid line) and inbreeding with a first order relative (dashed line). (B) Relationship between the magnitude of inbreeding depression in offspring viability (<i>β</i>) and optimal parental investment (<i>m<sup>*</sup></i>) across four degrees of relatedness (<i>r</i>) between a focal female and the sire of her offspring. (C) Relationship between <i>β</i> and a focal female's inclusive fitness (<i>γ</i>) across four <i>r</i> values when focal females invest optimally given their degree of inbreeding, and (D) invest at the optimum for outbreeding.

Relationship between parental investment (<i>m</i>) and the number of identical-by-descent (IBD) copies of a focal female's alleles that are present in its viable offspring (<i>ζ<sub>off</sub></i>) for females that are outbred (<i>f = 0</i>; solid upper curve) versus females that are inbred (<i>f = 1/4</i>; dot-dashed lower curve). Grey shading between the curves shows the difference in <i>ζ<sub>off</sub></i> between outbred and inbred females across different degrees of parental investment. Thin grey tangent lines for each curve identify optimal parental investment (<i>m<sup>*</sup></i>).

Assuming strict monogamy, the (A) relationship between parental investment (<i>m</i>) and the number of identical-by-descent (IBD) copies of a focal female's alleles that are inherited by its viable offspring (<i>ζ<sub>off</sub></i>) for females that outbreed (<i>r=0</i>; solid curve) and females that inbreed with first order relatives (<i>r=1/2</i>; dashed curve). Tangent lines identify optimal parental investment (<i>m<sup>*</sup></i>), and their slopes (<i>γ<sup>*</sup></i>) define a female's inclusive fitness when outbreeding (solid line) and inbreeding (dashed line). (B) Relationship between the magnitude of inbreeding depression (<i>β</i>) and <i>m<sup>*</sup></i> across four degrees of relatedness (<i>r</i>) between a focal female and the sire of her offspring. (C) Relationship between <i>β</i> and a focal female's inclusive fitness (<i>γ</i>) across four <i>r</i> values when focal females invest optimally given their degree of inbreeding, and (D) females invest at the optimum for outbreeding.