The provisions of this Section are applicable to all developments, enlargements and site alterations within the Special Natural Area District, pursuant to Section 105-02 (General Provisions). When pursuant to Sections 105-41 (Certification) or 105-021 (Actions not requiring special review), it is not necessary for an applicant for a development, enlargement or a site alteration to apply for an authorization or special permit, such development, enlargement or site alteration shall nonetheless comply with the natural feature preservation requirements of this Section, inclusive.