This chapter focuses on the ecological response mechanisms of the Luquillo Mountains tonatural and human-induced disturbances, such as hurricanes and land cover change. It identifies the ecosystems of the Luquillo Mountains as a perfect representation of large masses of a non-frost tropical land because of its naturally occurring features: high rainfall, hurricane disturbances, maritime climate, and insularity. It then sets out the Luquillo Long-Term Ecological Research (LTER) program as a by-product of the 20th and 21st century experimentations, and discusses its contributions to the basic understanding of the ecological make-up and biogeochemistry of the Luquillo Mountains
