Wanderlust World Wanderlust World El Yunque National Forest, the only tropical rainforest in the U.S. National Forest System, hosts a rich web of biotic interactions that sustain its biodiversity.
Bees, butterflies, hummingbirds, and bats transfer pollen among flowers, enabling reproduction of countless plant species, including many endemics.
Birds (e.g., Puerto Rican parrot), bats, and mammals consume fruits and excrete seeds elsewhere, colonizing new areas and maintaining forest regeneration.
Red-tailed hawks, Puerto Rican boas, and sharp-shinned hawks regulate populations of prey like anoles, coquís (frogs), and rodents, preventing overgrazing and maintaining balance.
Ant-plant mutualisms: Cecropia trees provide hollow stems and food bodies for Azteca ants; ants defend trees from herbivores and vines. Mycorrhizal fungi exchange soil nutrients for plant sugars.
Interspecific: Tree species compete for light, nutrients, space. Intraspecific: Dense seedlings compete; only few reach canopy. Epiphytes (orchids, bromeliads) compete for canopy perches.
These interactions drive nutrient cycling, succession, and resilience. Disruption—from invasive species, habitat fragmentation, or climate change—can cascade through the food web.
El Yunque's biotic complexity exemplifies tropical rainforest ecology and underscores the need for continued conservation.