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| green turtle | |
|---|---|
| Name | Green turtle |
| Status | Endangered |
| Status system | IUCN3.1 |
| Genus | Chelonia |
| Species | mydas |
| Authority | (Linnaeus, 1758) |
green turtle The green turtle is a large, herbivorous marine chelonian notable for its rounded carapace and long-distance migrations. It is a widely recognized species in global conservation, appearing in regional conventions and international agreements addressing maritime biodiversity. Populations are monitored by agencies across the Caribbean Sea, Indian Ocean, and Pacific Ocean and feature in studies by institutions such as the International Union for Conservation of Nature and the Convention on International Trade in Endangered Species of Wild Fauna and Flora.
The species was described by Carl Linnaeus in 1758 and placed in the genus Chelonia. It belongs to the family Cheloniidae, which includes other marine turtles such as loggerhead sea turtle and hawksbill sea turtle. Historic taxonomic work by naturalists associated with the Royal Society and museums like the Natural History Museum, London influenced early classification. Modern revisions have incorporated genetic analyses from laboratories at institutions including the Smithsonian Institution and the Australian Museum, clarifying relationships with taxa discussed in publications by researchers at the University of Queensland and Monash University.
Adults have a single large carapace, reaching up to 1.5 m in length and several hundred kilograms in weight, as documented in field reports from Great Barrier Reef surveys and studies by the University of Miami. The carapace coloration ranges from olive to brown with radiating patterns, while the plastron is lighter; detailed morphological descriptions appear in monographs published by the American Museum of Natural History and the Zoological Society of London. The species has a serrated jaw adapted for grazing on seagrass and algae, a trait compared in functional morphology analyses by researchers at the University of California, Davis and the Scripps Institution of Oceanography. Skeletal and developmental studies have been carried out in collaboration with the Royal Ontario Museum and the Natural History Museum of Los Angeles County.
The species inhabits tropical and subtropical waters worldwide, with significant nesting aggregations in regions such as the Galápagos Islands, Hawaii, Ascension Island, Florida Keys, Suriname, and Mauritius. Foraging grounds include seagrass beds in the Caribbean Sea and coastal lagoons in the South China Sea. Satellite telemetry projects led by teams at the Woods Hole Oceanographic Institution and NOAA have mapped migratory corridors between nesting beaches and feeding grounds, revealing transboundary movements that implicate jurisdictions including Mexico, Brazil, India, and Japan. Habitat use is influenced by coastal development assessed in reports from the World Wildlife Fund and United Nations Environment Programme.
The species exhibits site fidelity to traditional nesting beaches; behavioral ecology studies by researchers affiliated with Duke University and the Florida Sea Turtle Conservancy document natal homing and timing synchronized with lunar cycles. Diet shifts from omnivorous juveniles to predominantly herbivorous adults are recorded in ecological surveys conducted by the Organisation for Economic Co-operation and Development coastal programs and university marine labs such as the University of Exeter. The species plays a keystone role in seagrass ecosystem dynamics; restoration projects supported by the European Commission and NGOs such as The Nature Conservancy highlight its influence on seagrass productivity and carbon sequestration. Predator–prey interactions involve species protected under the Endangered Species Act and studied by teams at the Monterey Bay Aquarium Research Institute.
Reproductive biology has been documented through long-term monitoring at sites like Tortuguero National Park and Raine Island, where scientists from the University of Costa Rica and the Queensland Government conduct nesting censuses. Females lay clutches of eggs in sandy nests above the high-tide line; clutch size, incubation duration, and temperature-dependent sex determination are central topics in papers from the Smithsonian Tropical Research Institute and the James Cook University. Hatchling dispersal and early life-stage ecology, including pelagic “lost years,” have been investigated using methods developed at the National Oceanic and Atmospheric Administration and the University of Florida.
Major threats include bycatch in fisheries regulated under organizations like the Food and Agriculture Organization of the United Nations, coastal development reviewed by the World Bank, illegal harvest targeted in enforcement actions by the International Criminal Police Organization, and marine pollution addressed by MARPOL-related initiatives. Conservation measures comprise protected areas established by governments of Australia, Costa Rica, United States of America, and Brazil, as well as international listings under the IUCN Red List and CITES. Recovery programs often involve collaborations between universities such as the University of the West Indies, NGOs like Sea Shepherd Conservation Society, and indigenous communities recognized in instruments like the United Nations Declaration on the Rights of Indigenous Peoples.
The species has cultural importance for coastal peoples in locales including Hawaii, Aotearoa New Zealand, Kiribati, and Yap, where turtles appear in oral histories, traditional ceremonies, and artisanal fisheries regulated by local councils and institutions like the Secretariat of the Pacific Community. Culinary and trade uses have prompted international regulation and community-based alternatives promoted by organizations such as the Food and Agriculture Organization and UNESCO World Heritage site managers. Ecotourism centered on nesting beaches generates income in countries like Ecuador, Ghana, and Madagascar, with visitor management guidelines developed by conservation bodies including the World Tourism Organization.