Very low levels of direct additive genetic variance in fitness and fitness components in a red squirrel population.
McFarlane SE, Gorrell JC, Coltman DW, Humphries MM, Boutin S, McAdam AG. Very low levels of direct additive genetic variance in fitness and fitness components in a red squirrel population. Ecol Evol. 2014 May; 4(10):1729-38.