Why in News?
The Loggerhead Turtle (Caretta caretta) is currently in the news due to a major 17-year study published, which reveals that climate change is causing these turtles to shrink in size and produce fewer eggs.
Key Information
- Reproductive Decline: A long-term study published in the journal Animals (2026) found that warming oceans are "quietly eroding" the reproductive output of loggerheads.
- Physical Shrinking: Researchers observed that female loggerheads are becoming smaller in size, leading to smaller "clutch sizes" (fewer eggs per nest).
- Altered Breeding Cycles: While turtles are adapting by nesting earlier in the year due to warmer temperatures, the interval between their breeding seasons has doubled from two years to four years.
- Rescue and Rehabilitation: In February 2026, a rare loggerhead named "Crush" made headlines in the UK after being rescued from a beach in Jersey. The turtle was cold-stunned (a hypothermia-like state) and is currently undergoing rehabilitation at the Weymouth Sea Life Centre.
- Scientific Identity: Scientifically known as Caretta caretta, it is the world’s largest hard-shelled turtle.
- Physical Features:
- Head & Jaws: Named "Loggerhead" for its massive head and exceptionally powerful jaws, used to crush hard-shelled prey like crabs, clams, and sea urchins.
- Shell: Features a reddish-brown, heart-shaped carapace (top shell) and a pale-yellow plastron (bottom shell).
- Navigation: Known as a "magnetic navigator," it uses the Earth’s geomagnetic field as a map to travel thousands of kilometres back to the exact beach where it was born (natal homing).
- Diet: Primarily carnivorous/omnivorous, feeding on bottom-dwelling invertebrates, jellyfish, and occasionally algae.
- Conservation Status:
- IUCN Red List: Classified as Vulnerable.
- Wildlife Protection Act (India): Listed under Schedule I, providing it the highest level of legal protection.
- Major Threats:
- Bycatch: Accidental capture in fishing gear (trawls, longlines, and gillnets) is the primary threat.
- Climate Change: Warming sands lead to temperature-dependent sex determination, where hotter nests produce almost exclusively females, threatening the population's gender balance.
- Pollution: Ingestion of marine debris, particularly plastic bags mistaken for jellyfish, causes internal blockages and death.
Habitat & Distribution
- Global Range: Found in the Atlantic, Pacific, and Indian Oceans, as well as the Mediterranean Sea.
- Nesting Hotspots: Major nesting sites include Florida (USA), Oman, Greece, and Western Australia.
- Indian Context: While they do not typically nest on Indian beaches, they are frequently found in Indian coastal waters, and nests have been recorded in nearby Sri Lanka and the Gulf of Mannar.
Download Pdf
