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| Tropical Eastern Pacific | |
|---|---|
| Name | Tropical Eastern Pacific |
| Location | Eastern Pacific Ocean |
| Countries | Ecuador; Peru; Colombia; Panama; Costa Rica; Nicaragua; Honduras; El Salvador; Guatemala; Mexico |
Tropical Eastern Pacific is a marine biogeographic region of the eastern equatorial Pacific Ocean characterized by warm tropical waters, distinctive currents, and high levels of endemism. The region spans coastlines and offshore islands influenced by the intertropical convergence, equatorial current system, and periodic climate oscillations such as El Niño. It supports important fisheries, unique coral and mangrove habitats, and internationally significant migratory pathways.
The Tropical Eastern Pacific encompasses coastal and insular zones from southern Mexico through Central America to northern Peru, including the Gulf of Tehuantepec, Galápagos Islands, Cocos Island, Revillagigedo Islands, and the continental shelves off Ecuador, Colombia, Panama, Costa Rica, Nicaragua, Honduras, El Salvador, and Guatemala. It lies adjacent to major oceanographic regions such as the Equatorial Pacific, North Pacific Ocean, and the South Pacific Ocean and is bounded to the east by the Pacific coast of the Americas and to the west by the open Pacific basin and island arcs like the Line Islands. Prominent geographic features include the Humboldt Current upwelling system interface, the Eastern Pacific Barrier, and the Equatorial Counter Current pathways that affect connectivity to regions like the Central Pacific and Western Pacific Warm Pool.
Surface conditions are governed by the Intertropical Convergence Zone, trade winds associated with the Hadley cell, and variability tied to the El Niño–Southern Oscillation as identified by institutions such as the National Oceanic and Atmospheric Administration and International Research Institute for Climate and Society. The Tropical Eastern Pacific exhibits seasonal sea surface temperature gradients influenced by the Cromwell Current (also called the Pacific Equatorial Undercurrent), the Peru Current (Humboldt), and episodic intrusions from the California Current during extreme events. Oceanographic phenomena documented by expeditions like the HMS Challenger and programs such as the Global Ocean Observing System include strong thermocline shoaling, variable upwelling intensity near the Peruvian coast, and mesoscale eddies tracked by satellites from NASA and European Space Agency missions.
The region hosts notable ecosystems including coral reefs (fringing and patch reefs around the Galápagos Islands and Revillagigedo Islands), extensive mangrove forests along the Guayas River estuary and Central American coasts, seagrass meadows, rocky intertidal zones, and pelagic habitats that support tuna and shark assemblages. Endemic taxa are recorded across taxa such as reef fishes, gastropods, and echinoderms; notable genera include Spondylus, Conus, and Holothuria. The Tropical Eastern Pacific is a migratory corridor for species listed in conventions like the Convention on Migratory Species including humpback whale populations that utilize breeding grounds in Ecuador and Costa Rica, sea turtle populations (e.g., olive ridley sea turtle) nesting on beaches like those in Osa Peninsula and Nicaragua, and seabird colonies such as blue-footed booby aggregations on the Galápagos Islands.
Coastal communities in ports like Manta, Salinas (Ecuador), Buenaventura, Limon (Costa Rica), and Manzanillo, Colima rely on artisanal and industrial fisheries targeting small pelagics and large tunas managed under regional bodies such as the Inter-American Tropical Tuna Commission and national agencies like the Instituto Geofísico del Perú. Major fisheries include catches of skipjack tuna, yellowfin tuna, anchoveta exploited by fleets operating from harbors like Callao and Guayaquil. Aquaculture ventures near lagoons documented by development banks and NGOs focus on shrimp and bivalves. Shipping lanes linking ports such as Balboa (Panama) and Acapulco traverse the region, and tourism to sites like the Galápagos Islands and Manuel Antonio National Park contributes to regional economies promoted by organizations like the World Tourism Organization.
Protected areas include national and international designations such as the Galápagos Marine Reserve, Cocos Island National Park, Revillagigedo National Park, and multiple Ramsar sites along Central American coasts recognized under the Ramsar Convention. Conservation efforts involve NGOs such as World Wildlife Fund, Conservation International, and regional research bodies including the Smithsonian Tropical Research Institute and Charles Darwin Foundation. Multilateral instruments like the Convention on Biological Diversity and initiatives by the Inter-American Development Bank support marine spatial planning, marine protected area networks, and community-based management schemes in places like Chocó-Darién and the Gulf of Panama.
The Tropical Eastern Pacific experiences strong ecological and socioeconomic impacts from El Niño events, documented in historical records including the 1997–98 El Niño and 1982–83 El Niño, which caused coral bleaching, fishery collapses (notably Peruvian anchoveta), and altered rainfall patterns affecting cities like Lima and Quito. Long-term climate change projections by the Intergovernmental Panel on Climate Change indicate warming sea surface temperatures, acidification trends monitored by programs like the Joint Oceanographic Institutions collaborations, and shifts in upwelling intensity that threaten kelp, mangrove, and coral systems. Response strategies reference frameworks developed by the United Nations Framework Convention on Climate Change and regional adaptation plans implemented by institutions such as the Food and Agriculture Organization.
Scientific research is conducted by universities and institutes including the University of California, Santa Cruz programs in marine ecology, Pontificia Universidad Católica del Ecuador studies in oceanography, and multinational projects coordinated by NOAA, NASA, Scripps Institution of Oceanography, and the Woods Hole Oceanographic Institution. Long-term monitoring networks employ float arrays from the Argo program, satellite altimetry from TOPEX/Poseidon and Jason series, and fisheries data compiled by the Food and Agriculture Organization of the United Nations. Collaborative research campaigns and expeditions by vessels like the RV Roger Revelle and institutions such as the Monterey Bay Aquarium Research Institute focus on biodiversity assessments, trophic dynamics, and the impacts of climate variability in the Tropical Eastern Pacific.