Long-Term Ecological Changes of Coral Reefs in the Luis Peña Channel No-Take Natural Reserve, Culebra Island, Puerto Rico. Edwin A. Hernández-Delgado Alberto M. Sabat University of Puerto Rico Department of Biology Coral Reef Research Group PO Box 23360 San Juan, Puerto Rico 00931-3360 E-mail: coral_giac@yahoo.com Technical Report submitted to the Sea Grant College Program University of Puerto Rico, Mayagüez Campus Project R-101-3-00 November 1, 2003