Puerto Rico
Biodiversity

Puerto Rico is home to three terrestrial ecoregions: Puerto Rican moist forests, Puerto Rican dry forests, and Greater Antilles mangroves. Puerto Rico has two biosphere reserves recognized by the UNESCO Man and the Biosphere Programme: Luquillo Biosphere Reserve represented by El Yunque National Forest and the Guánica Biosphere Reserve.

Species endemic to the archipelago number 239 plants, 16 birds and 39 amphibians / reptiles, recognized as of 1998. Most of these (234, 12 and 33 respectively) are found on the main island. The most recognizable endemic species and a symbol of Puerto Rican pride is the coquí, a small frog easily identified by the sound of its call, from which it gets its name. Most coquí species (13 of 17) live in the El Yunque National Forest, the only tropical rainforest in the U.S. Forest Service system, located in the northeast of the island. It was previously known as the Caribbean National Forest. El Yunque is home to more than 240 plants, 26 of which are endemic to the island. It is also home to 50 bird species, including the critically endangered Puerto Rican amazon.

In addition to El Yunque National Forest, the Puerto Rican moist forest ecoregion is represented by protected areas such as the Maricao and Toro Negro state forests. These areas are home to endangered endemic species such as the Puerto Rican boa (Chilabothrus inornatus), the Puerto Rican sharp-shinned hawk (Accipiter striatus venator), the Puerto Rican broad-winged hawk (Buteo platypterus brunnescens) and the elfin woods warbler (Setophaga angelae). The Northern Karst country of Puerto Rico is also home to one of the remaining rainforest tracts in the island, with the Río Abajo State Forest being the first focus for the reintroduction of the highly endangered Puerto Rican parrot outside of the Sierra de Luquillo.

In the southwest, the Guánica State Forest and Biosphere Reserve contain over 600 uncommon species of plants and animals, including 48 endangered species and 16 that are endemic to Puerto Rico, and is considered a prime example of the Puerto Rican dry forest ecoregion and the best-preserved dry forest in the Caribbean. Other protected dry forests in Puerto Rico can be formed within the Caribbean Islands National Wildlife Refuge complex at the Cabo Rojo, Desecheo, Culebra and Vieques National Wildlife Refuges, and in the Caja de Muertos and Mona and Monito Islands Nature Reserves. Examples of endemic species found in this ecoregion are the higo chumbo (Harrisia portoricensis), the Puerto Rican crested toad (Peltophryne lemur), and the Mona ground iguana (Cyclura stejnegeri), the largest land animal native to Puerto Rico.

Puerto Rico has three of the seven year-long bioluminescent bays in the Caribbean: Laguna Grande in Fajardo, La Parguera in Lajas and Puerto Mosquito in Vieques. These are unique bodies of water surrounded by mangroves that inhabited by the dinoflagellate Pyrodinium bahamense. However, tourism, pollution, and hurricanes have highly threatened these unique ecosystems.
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