Table. 2 Overview of the maternal investment metrics in mammals according to six alternative regression models fitted to the same dataset (N = 738 species)

From: Quantifying maternal investment in mammals using allometry

Model

Metric

SLR

\({{MI}}_{{\rm SLR}}={\log }_{10}\frac{{m}_{{\rm lw}}}{{{0.637\times m}_{\rm a}}^{0.778}}\)

PLMM

\({{MI}}_{{\rm PLMM}}=\log_{10}\frac{{m}_{{\rm lw}}}{{{0.643\times m}_{\rm a}}^{0.806}}\)

SMA

\({{MI}}_{{\rm SMA}}={\log }_{10}\frac{{m}_{{\rm lw}}}{0.645\times {{m}_{\rm a}}^{0.799}}\)

MA

\({{MI}}_{{\rm MA}}=\log_{10}\frac{{m}_{{\rm lw}}}{0.643\times {{m}_{\rm a}}^{0.795}}\)

MSLR

\({{MI}}_{{\rm MSLR}}={\log }_{10}\frac{{m}_{{\rm lw}}}{4.61\times {{m}_{\rm a}}^{0.867}\times {d}^{-0.398}}\)

MPLMM

\({{MI}}_{{\rm MPLMM}}=\log_{10}\frac{{m}_{{\rm lw}}}{1.60\times {{m}_{\rm a}}^{0.836}\times {d}^{-0.199}}\)

  1. mlw represents the observed litter mass at weaning. See legend Table 1 for more details.