Any city member of the regional commission may, after a public hearing before the city council, be removed by the mayor by and with the consent of a three-fourths vote of the Council, for inefficiency, neglect of duty, malfeasance in office, or other good and sufficient cause. Vacancies occurring otherwise than through the expiration of term shall be filled for the unexpired term by the mayor, by and with the approval of a majority vote of all the members elected to the council.