Eye-lens weight curve for estimation of age in the Japanese grass vole, Microtus montebelli Milne-Edwards (Rodentia: Muridae)

抄録

We established a standard curve for age estimation of the Japanese grass vole, Microtus montebelli, from eye-lens weight as a tool for analyses of ages in the vole population. Predicted age was given by the equations, x=10^{(Y+2.00)/3.24} for males, and x=10^{(Y+1.72)/2.94} for females, where Y is weight of paired lenses in mg and x is predicted age in days. Indices of predictive accuracy of the technique (S_yx/Y: the standard error of estimate divided by the mean of Y) were 0.059 and 0.073 for males and females, respectively.