🗞️ Why in News: Researchers have documented a giant coral colony near Kadmat Island, Lakshadweep — a massive Pavona clavus formation locally called the “Potato Patch” covering approximately 4,250 square metres (about 0.43 hectares). Preliminary growth-rate estimates suggest the colony is 700 to 1,800 years old, and it could be among the world’s largest known single living coral colonies. The study also found that 58.47% of its tissue remains alive — a sign of remarkable resilience given repeated bleaching events and marine heatwaves.
Discovery at a Glance
| Parameter | Detail |
|---|---|
| Species | Pavona clavus (a reef-building / hermatypic coral) |
| Location | Kadmat Island, Lakshadweep |
| Local name | “Potato Patch” |
| Size | ~4,250 sq m (~0.43 ha; ~1.05 acres) |
| Estimated age | 700–1,800 years (needs scientific dating to confirm) |
| Tissue alive | 58.47% — indicates relatively healthy state |
| Significance | Possibly one of the world’s largest known single living coral colonies |
About Pavona clavus
- Pavona clavus is a species of stony (scleractinian) coral belonging to the family Agariciidae.
- It grows as a massive, mound-shaped colony (“massive coral”) — unlike branching or table corals.
- Slow-growing species — making a 4,250 sq m colony a multi-century-old ecosystem.
- Reef-building (hermatypic) — contributes calcium carbonate skeleton to the reef structure.
Lakshadweep’s Coral Ecosystems
| Feature | Detail |
|---|---|
| Islands | 36 islands, atolls, and reef systems; 12 inhabited |
| Coral-reef area | Among India’s most pristine and biodiverse coral ecosystems |
| IUCN status | Part of Indian Ocean biodiversity hotspot |
| Threats | Marine heatwaves (bleaching), ocean acidification, rising sea temperatures, anchoring damage |
| Governance | Lakshadweep is a Union Territory (centrally administered); marine protected areas under the Indian Wildlife (Protection) Act |
Why Colony Size Matters
- Genetic diversity reservoir — a centuries-old mega-colony is a genetic repository of climate-adapted coral strains.
- Reef structure — massive corals are the backbone of reefs; their size contributes to reef accretion and coastal protection.
- Resilience signal — 58.47% live tissue after repeated bleaching events (2016, 2020, 2025) shows this colony has exceptional thermal tolerance — a trait of high conservation value.
- Scientific benchmark — mega-colonies allow scientists to study multi-century responses to environmental change without proxy records.
Context — Coral Bleaching and Climate Change
Coral bleaching occurs when elevated sea surface temperatures (SSTs) cause coral to expel their zooxanthellae (symbiotic algae that provide 70-90% of the coral’s energy via photosynthesis). Without zooxanthellae, corals turn white and, if stress persists, die.
- The 2025–26 global bleaching event (NOAA confirmed 4th global bleaching event) affected Indian Ocean reefs including Lakshadweep.
- India’s average SST in the Arabian Sea has risen faster than global ocean averages.
UPSC Relevance
| Paper | Relevance |
|---|---|
| GS3 | Environment — coral reefs, bleaching, marine biodiversity, climate change |
| GS1 | Geography — Lakshadweep, Indian Ocean islands, atolls |
| Prelims | Pavona clavus; Lakshadweep (UT, 12 inhabited); coral bleaching mechanism (zooxanthellae); NOAA global bleaching events; hermatypic / scleractinian corals |
Facts Corner
📌 Facts Corner — Knowledgepedia
Lakshadweep “Potato Patch” Coral:
- Species: Pavona clavus (stony coral, family Agariciidae)
- Location: Kadmat Island, Lakshadweep (UT)
- Size: ~4,250 sq m (~0.43 ha)
- Estimated age: 700-1,800 years (scientific dating pending)
- Live tissue: 58.47%
- Significance: possibly world’s largest known single living coral colony
Coral bleaching:
- Triggered by elevated SST → coral expels zooxanthellae (symbiotic algae) → turns white
- Prolonged stress → death
Lakshadweep: 36 islands; 12 inhabited; Union Territory; Kadmat is one of the inhabited islands
Hermatypic corals: reef-building corals; secrete calcium carbonate skeleton
Sources: Down to Earth, The Hindu, Ministry of Environment, Forest and Climate Change
Source: Lakshadweep's 'Potato Patch' — One of the World's Largest Living Coral Colonies — Ujiyari.com | Free UPSC & State PCS Current Affairs
