Scientific Research at Isla del Coco National Park and Adjacent Waters, Pacific Costa Rica.

Revista de Biología Tropical proudly presents the fourth Special Issue on Isla del Coco (Cocos Island) and its adjacent waters (see references below). This volume is the result of the Isla del Coco International Symposium, organized by the Center for Research in Marine Science and Limnology (CIMAR) of the University of Costa Rica. The symposium, held on February 13-15, 2018, celebrating the 40^th anniversary of the creation of Isla del Coco National Park, and featuring experts from diverse fields coming from Costa Rica, Argentina, Chile, Ecuador, El Salvador, Spain, México, United States and Venezuela. For this Special Issue, 35 manuscripts were received and, after peer review, 25 were accepted.

We are grateful to the participants of the symposium and especially to the contributors of manuscripts. As a result of the critical work carried out by 73 reviewers, we now have in our hands an issue that will advance the knowledge of the treasure that is Isla del Coco and its adjacent waters.

The production of this Special Issue has been possible thanks to the economic support provided by Universidad de Costa Rica, Undersea Hunter Group, and Costa Rica for Ever.