The coral reefs in India are among the most ancient and dynamic ecosystems, providing a habitat for thousands of marine species. In the marine ecosystem notes UPSC syllabus, these reefs are classified as a “major ecosystem” that requires intensive conservation due to their sensitivity to climate change and human interference.
Definition of Coral Reefs
Coral reefs are large underwater structures composed of the skeletons of colonial marine invertebrates called polyps. These polyps have a symbiotic relationship with zooxanthellae (microscopic algae), which provide food through photosynthesis. The accumulation of calcium carbonate secreted by these polyps over thousands of years forms the massive reef structures we see today.
Distribution of Coral Reefs in India
The major indian coral reefs notes highlight four primary regions where reefs are concentrated:
Andaman and Nicobar Islands: The most extensive reef area in India, characterized by fringing reefs and high biodiversity.
Lakshadweep Islands: The only region in India consisting entirely of atolls (ring-shaped reefs surrounding a lagoon).
Gulf of Mannar: Located between India and Sri Lanka, this region features fringing reefs and is part of a UNESCO Biosphere Reserve.
Gulf of Kachchh: Notable for being the northernmost reefs in India, these are patchy/fringing reefs that survive under high-stress conditions like high turbidity.
Characteristics of Indian Coral Reefs
- Diversity of Forms: India is unique in hosting almost all types of coral reefs—fringing, barrier, and atoll.
- Climatic Sensitivity: Most Indian reefs are tropical and thrive in water temperatures between 20°C and 30°C.
- High Endemism: Many species found in the Andaman or Lakshadweep waters are unique to the northern Indian Ocean.
Biodiversity of Coral Reefs in India
Indian reefs are home to:
- Corals: Over 500 species of hard and soft corals.
- Marine Fauna: Species like the Dugong (Sea Cow), Sea Turtles (Green and Hawksbill), Dolphins, and thousands of varieties of reef fish like the Parrotfish and Butterflyfish.
- Flora: Vast beds of seagrasses and associated mangrove ecosystems that act as nurseries for reef species.
Types of Coral Reefs in India
The types of coral reefs in india can be categorized as:
- Fringing Reefs: Andaman & Nicobar, Gulf of Mannar, and Gulf of Kachchh.
- Atolls: Exclusively in the Lakshadweep archipelago.
- Barrier Reefs: Small sections are found off the coast of the Andaman Islands.
Government Initiatives & Legal Framework
The Government of India has taken several steps to protect these fragile biomes:
- Wildlife Protection Act, 1972: All reef-building corals in India are listed under Schedule I, giving them the highest level of legal protection (equivalent to tigers).
- Coastal Regulation Zone (CRZ) Notification: Prohibits construction and certain industrial activities near reef areas.
- National Committee on Wetlands, Mangroves, and Coral Reefs: Formulates policy and monitors conservation projects.
- Coastal Ocean Monitoring and Prediction System (COMAPS): Monitors health parameters of coral ecosystems.
Importance of Coral Reefs in India
- Economic Security: Supports the livelihoods of millions through fisheries and eco-tourism.
- Coastal Protection: Acts as a natural barrier against cyclones, tsunamis, and storm surges, which are frequent in the Bay of Bengal.
- Bio-prospecting: Potential sources for new medicines and biochemicals.
Threats to Coral Reefs in India
The phenomenon of coral bleaching in india is the most pressing threat:
- Climate Change: Rising Sea Surface Temperatures (SST) causing massive bleaching events, notably in 1998, 2010, and 2016.
- Anthropogenic Pressure: Overfishing, destructive fishing practices (dynamite), and unregulated tourism.
- Pollution: Siltation from agricultural runoff and plastic pollution in the islands.
- Invasive Species: Outbreaks of the Crown-of-Thorns starfish.
Conservation Measures
- Coral Restoration: Use of Biorock technology in the Gulf of Kachchh and “coral gardening” in Lakshadweep.
- Marine Protected Areas (MPAs): Establishment of Marine National Parks (e.g., Mahatma Gandhi Marine National Park, Port Blair).
- Community Engagement: Involving local fishermen in monitoring reef health and preventing illegal poaching.
Conclusion
For the coral reefs in india UPSC syllabus, it is clear that these ecosystems are at a crossroads. While they provide immense ecological value, they are highly vulnerable to the global climate crisis. Strengthening our marine ecosystem notes UPSC through sustainable management and robust policy implementation is the only way to ensure that India’s “blue heritage” remains intact for future generations.
UPSC Prelims: PYQs & Practice Questions
Previous Year Questions (Prelims)
Q: Which of the following have coral reefs?
1. Andaman and Nicobar Islands
2. Gulf of Kachchh
3. Gulf of Mannar
4. Sunderbans
Select the correct answer using the code given below:
(a) 1, 2 and 3 only
(b) 2 and 4 only
(c) 1 and 3 only
(d) 1, 2, 3 and 4
Answer: (a) 1, 2 and 3 only
Explanation:
Major coral reefs in India are found in the Andaman & Nicobar Islands, Gulf of Mannar, Gulf of Kachchh, and Lakshadweep. The Sunderbans is a mangrove ecosystem. The heavy freshwater discharge and high sediment load from the Ganga-Brahmaputra system create conditions of high turbidity and low salinity, which are unsuitable for coral growth.
Q: "Biorock technology" is talked about in which one of the following contexts?
(a) Restoration of damaged coral reefs
(b) Development of building materials using plant residues
(c) Identification of areas for exploration/extraction of shale gas
(d) Providing salt licks for wild animals in forests
Answer: (a) Restoration of damaged coral reefs
Explanation:
Biorock technology (or mineral accretion technology) uses low-voltage electrical currents in seawater to crystallize dissolved minerals on steel structures. These structures provide an ideal surface for coral larvae to attach and grow rapidly, even under stressed environmental conditions. The technology has been piloted in the Gulf of Kachchh by the Zoological Survey of India.
Practice Questions
Q: With reference to the legal protection of corals in India, consider the following statements:
1. All reef-building corals are protected under Schedule I of the Wildlife Protection Act, 1972.
2. The Gulf of Mannar Marine National Park was the first marine biosphere reserve in Southeast Asia.
3. Coastal Regulation Zone (CRZ)-I allows the setting up of chemical industries if they are 500 meters away from the High Tide Line of a coral reef.
Which of the statements given above is/are correct?
(a) 1 and 2 only
(b) 2 only
(c) 3 only
(d) 1, 2 and 3
Answer: (a) 1 and 2 only
Explanation:
Statement 1 is correct because reef-building corals receive the highest legal protection under Schedule I of the Wildlife Protection Act, 1972. Statement 2 is also correct as the Gulf of Mannar Biosphere Reserve, established in 1989, was the first marine biosphere reserve in Southeast Asia. Statement 3 is incorrect because CRZ-I areas are ecologically sensitive zones where new industries are strictly prohibited.
Q: Which of the following regions in India is the ONLY one to host atoll formations?
(a) Andaman and Nicobar Islands
(b) Gulf of Mannar
(c) Lakshadweep
(d) Malvan Coast
Answer: (c) Lakshadweep
Explanation:
Lakshadweep is India’s only coral archipelago composed entirely of atolls, which are circular coral reefs surrounding a lagoon. Other coral reef regions in India, such as the Andaman & Nicobar Islands and the Gulf of Mannar, mainly contain fringing reefs.
UPSC Mains – Previous Year & Practice Questions
Mains Previous Year Questions
Question: Discuss the causes and effects of ocean acidification on the marine food chain. (Mains 2022)
(Directly impacts the calcification and survival of Indian coral reefs)
Question: Assess the impact of global warming on the coral life system with suitable examples. (Mains 2018)
(Important for understanding coral bleaching events in India)
Question: Account for the variations in oceanic salinity and discuss its multi-dimensional effects. (Mains 2017)
(Explains why coral reefs are absent in highly deltaic regions like the Bay of Bengal coast)
Question: What is the economic importance of the marine ecosystem in India? Discuss the potential of the Blue Economy. (Mains 2015)
Question: Explain the formation of Atolls and distinguish them from Barrier Reefs. (Mains 2014)
Mains Practice Questions
[10 Marks | 150 Words]
Question: Despite India’s long coastline, coral reefs are restricted to only a few specific pockets. Analyze the geographical factors responsible for this limited distribution.
[15 Marks | 250 Words]
Question: How does the degradation of coral reefs in the Andaman and Nicobar Islands increase the vulnerability of the region to natural disasters such as tsunamis and storm surges?
[15 Marks | 250 Words]
Question: Critically evaluate the role of the Coastal Regulation Zone (CRZ) norms in balancing infrastructure development and coral reef conservation in India.
Coral reefs in India-FAQs
Why are there no coral reefs on the East Coast of mainland India (e.g., Odisha, Andhra Pradesh)?
The East Coast receives massive amounts of sediment and freshwater from large rivers like the Ganga, Brahmaputra, Mahanadi, and Godavari. Corals require clear, saline water; high turbidity (silt) chokes them, and low salinity prevents their growth.
What is 'Coral Bleaching' and has it happened in India?
Coral bleaching in India occurs when Sea Surface Temperatures (SST) rise, causing corals to expel their symbiotic algae. Major events were recorded in 1998, 2010, and 2016, with the Lakshadweep and Andaman reefs being the hardest hit.
What is the 'Dugong' and how is it related to Indian reefs?
The Dugong (Sea Cow) is a herbivorous marine mammal found in the Gulf of Mannar and Andaman Islands. It feeds on seagrass beds, which are an integral part of the larger coral reef ecosystem.
Which Indian reef is known for 'Biorock' restoration?
The Gulf of Kachchh in Gujarat. It was the first site in India to use this technology to restore damaged reef patches.
Are corals plants or animals?
They are animals. Corals are tiny colonial organisms called polyps (Phylum Cnidaria). They look like plants because of the colorful algae (zooxanthellae) living inside their tissues.
