The board of trustees of the wildlife endowment fund of the Division of Natural Resources has full authority over the administration of the wildlife endowment fund. The chairman of the board is the director of the Division of Natural Resources and the members are the executive secretary of the division, the division fiscal officer, the chief of the wildlife resources section, the chief of the law-enforcement section and six citizen members, to be appointed by the Governor. To the extent possible, the Governor shall appoint the citizen members to ensure an equal geographic representation throughout the state and their terms shall be staggered from July 1, 1999. Existing citizen members shall retain their appointed positions for a period of two years from that date. Initial citizen appointments to the board shall be as follows: Two citizen members shall be appointed for a term of three years; two citizen members shall be appointed for a term of four years; and subsequent citizen member appointments to the board shall be for a term of four years. No more than three citizen members may be members of one political party. The actual expenses of the citizen members incurred in the performance of their duties under this section are payable from funds of the division. The State Treasurer is the custodian of the wildlife endowment fund and shall invest its assets in accordance with the provisions of article six, chapter twelve of this code.