Upper panel: Redshift evolution of the median number of minor mergers that triggered the growth of MBHs hosted in different galaxies (N_{minor,  merg}). Lower panel: Redshift evolution of the median maximum baryonic mass ratio of minor mergers ($m_{R,\mathrm{minor}}^{\max }$) that triggered the MBH growth in different galaxies. The colour coding and mass dependence are the same as in Fig. 4.