Replacement migration in France involving populations
exhibiting lower means of IQ and higher rates of total fertility, such as Algerians, Moroccans, Tunisians and Roma (
Čvorić, 2014 and
Lynn and Vanhanen, 2012) may be increasing the rate of secular losses at the level of g, consistent with speculations advanced in
Dutton and Lynn (2015), however the additional loss in g due to this process is anticipated to be very small. Based on a simulation,
Nyborg (2012)estimates that in Denmark, replacement migration may be reducing heritable g by .28 points per decade, which would increase the overall loss in gto 1.51 points per decade (
Woodley of Menie, 2015),
this still being only 37.75% of the loss observed in the French cohort.