The Organisation for Economic Co-operation and Development has published a book on barriers to effective biodiversity policy reform. It includes a chapter on the use of conservation trust funds in funding marine protected areas, in Mauritania and Guinea-Bissau, through a mechanism akin to international payments for ecosystem services (chapter prepared by Fabien Quétier and Ariane Amin of Biotope).
The publication is currently available in e-book form, here. The print version should be available in the coming days.