Mangrove forests provide several important ecosystem services including (1) storage of high quantities of organic materials and nutrients; (2) sources of organic material supply to coral reefs; (3) environmental purification functions via feeding behaviors of benthic animals; (4) refuge for young coral reef fish; (5) sites for marine leisure activities such as kayaking; (6) habitat provision to birds, insects, and other animal species; (7) opportunities for food resources; and (8) opportunities for environmental education including ecotours; and others. To clarify these services, a preliminary survey was conducted in Palau, where mangroves connected to coral reefs are dominant along the coast.
Accumulations of organic materials were conspicuous around a river mouth area but were dispersed in coral reef areas. Research into biogeochemical cycles is necessary to clarify the importance of the ecosystem services of mangrove forests, and information on the sustainable use of mangrove and coral reef ecosystems for tourists is required. Ecosystem evaluations should also be conducted through interdisciplinary study.