All boards and commissions established for or under the authority of the City before the effective date of this Charter shall continue to exist and operate unless abolished by this Charter or by ordinance of City Council. Members of the boards and commissions existing on the effective date of this Charter and not abolished by its provisions shall remain in office for as long as their respective terms continue or until the status of their respective boards or commissions shall be altered by City Council. Vacancies in the membership of such boards and commissions shall be filled in accordance with this Charter.