Context: In a landmark conservation success, the International Union for Conservation of Nature (IUCN) has upgraded the Green Sea Turtle (Chelonia mydas) from Endangered to Least Concern. This reflects decades of global conservation efforts and improved protection of nesting beaches, feeding grounds, and migratory routes.
Population Recovery
Global populations of Green Sea Turtles have risen by approximately 28% since the 1970s, particularly in the Atlantic and Indo-Pacific regions. This rebound highlights the effectiveness of marine protected areas (MPAs), nesting site protection, and international conventions such as CITES and the Convention on Migratory Species (CMS).
However, certain regional subpopulations remain vulnerable due to localized habitat loss, fisheries bycatch, and illegal harvesting.
About the Green Sea Turtle (Chelonia mydas)
- Taxonomy: Belongs to the family Cheloniidae.
- Physical Traits: The largest hard-shelled sea turtle, named for the green hue of its body fat and cartilage, not its outer shell.
- Diet:
- Hatchlings: Omnivorous, feeding on small invertebrates.
- Adults: Strictly herbivorous, grazing on seagrasses and algae with beak-like jaws.
- Distribution: Found across tropical and subtropical oceans — the Atlantic, Pacific, and Indian Oceans, and parts of the Mediterranean.
- In India: Occurs along the mainland coasts, Lakshadweep, and Andaman–Nicobar Islands, with key nesting sites in Saurashtra and Great Nicobar.
- Habitat:
- Juveniles: Pelagic (open-ocean).
- Adults: Shallow coastal waters, lagoons, coral reefs, and seagrass meadows.
- Migration: Extremely migratory, travelling thousands of kilometres between feeding and nesting sites, guided by Earth’s magnetic field.
- Reproduction: Temperature-dependent sex determination — warmer sand produces more females, cooler produces more males.
Ecological Importance
- Keystone Role: Grazing maintains healthy seagrass ecosystems, enhances carbon sequestration, and supports marine biodiversity.
- Indicator Species: As long-lived (~80 years) marine reptiles, their health reflects oceanic ecosystem stability.
Threats
Despite recovery, the species faces persistent threats:
- Overharvesting and illegal egg collection.
- Bycatch in trawl and gill nets.
- Coastal development and light pollution disrupting nesting.
- Climate change altering sex ratios and nesting patterns.
Conservation Framework
| Convention/Act | Protection Status |
|---|---|
| IUCN Red List | Least Concern |
| CITES | Appendix I |
| CMS | Appendix I & II |
| Wildlife (Protection) Act, 1972 | Schedule I |
Conclusion
The upgradation of the Green Sea Turtle signals a major global conservation win and reinforces the impact of sustained community engagement, habitat protection, and international cooperation.
Continued vigilance is essential to ensure that regional populations also recover fully and the species continues to thrive as a vital guardian of marine ecosystems.