On publication of a proclamation under this Division--
(a) the Secretary has, until the establishment of a board of management for the lands, the care, control and management of the lands and may exercise on and with respect to those lands any power, authority, duty or function conferred or imposed on the Secretary by or under this or any other Act, and
(b) officers of the Service may (subject to any plan of management in force with respect to the lands and to any directions given and supervision and oversight exercised by the board of management for the lands) exercise on and with respect to those lands any power, authority, duty or function conferred or imposed on any one or more of them by or under this or any other Act.