The influence of the mechanisms of nuclear reactions on the population of 195 m Hg and 197 m Hg(7/2 − ), 198 m Tl and 196 m Tl(7 + ), and 196 m Au and 198 m Au(12 − ) isomeric nuclear states obtained in reactions induced by beams of 3 He, 6 Li, and 6 He weakly bound nuclei is studied. The behavior of excitation functions and high values of isomeric ratios ( δ m / δ g ) for products of nuclear reactions proceeding through a compound nucleus and involving neutron evaporation are explained within statistical models. Reactions in which the emission of charged particles occurs have various isomeric ratios depending on the reaction type. The isomeric ratio is lower in direct transfer reactions involving charged-particle emission than in reactions where the evaporation of charged particles occurs. Reactions accompanied by neutron transfer usually have a lower isomeric ratio, which behaves differently for different direct-reaction types (stripping versus pickup reactions).