Gas metallicity gradient as a function of the number of mergers up to redshift 2. Left and right panels: indicate major and minor mergers, respectively. Circles indicate subhalos from the control sample, while diamonds the subhalos in Fornax-like clusters. All the symbols are color coded according to their stellar mass. For the sake of clarity, all the subhalos in the control sample with a number of mergers between 0 and 2 were assigned random shifts (in the range ±0.25) around their actual value, while the subhalos in Fornax-like clusters are shifted to the right.