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Van Island Restoration in Gulf of Mannar – Complete UPSC Environment Case Study on Artificial Reefs

 

Van Island Restoration in Gulf of Mannar – Complete UPSC Case Study 

India has many environmental problems, but Van Island restoration in the Gulf of Mannar shows how science can restore nature. This is an important case study for UPSC Prelims, GS-3 Environment, and even Ethics.

This article explains everything in simple language with clear points.

1. Location and Geography

Van Island is a small uninhabited rocky island in the Gulf of Mannar near Tuticorin in Tamil Nadu. It is about 8 km away from the coast and is one of the 21 islands in this region.

The Gulf of Mannar lies between the southeast coast of India and northwest Sri Lanka. The coast here is called the Coromandel Coast. This region is part of the Laccadive Sea.

Important facts:

These facts are important for Prelims map questions.

2. What Was the Problem?

Van Island was shrinking very fast because of both natural and human causes.

Main reasons:

Between 1969 and 2015, the island lost about 92 percent of its area. This caused loss of coral reefs, fish habitats, and marine biodiversity.

This is an example of anthropogenic environmental damage.

3. How Scientists Restored the Island

Scientists used artificial reef technology.

They installed around 10,600 artificial reef modules around the island.

Purpose of artificial reefs:

  • Reduce wave force.

  • Trap sand and sediment.

  • Stop further erosion.

  • Help coral growth.

  • Increase fish population.

Artificial reefs act like natural coral structures. They protect the coast and provide homes for marine life.

This is called a nature-based solution.

4. Results of the Restoration

The project showed very good results.

Ecological results:

  • Island area increased from 1.53 hectares to more than 2.3 hectares.

  • 81 coral colonies formed.

  • Fish population increased eight times.

  • 26 native plant species protected.

  • Marine habitats improved.

Economic results:

  • Project cost about Rs 26.37 crore.

  • Benefits about Rs 61.61 crore.

  • Benefit-cost ratio greater than one.

This proves conservation can also be economically useful.

Social results:

  • Better income for fishermen.

  • Protection from storms for coastal villages.

  • Improved food security.

This case shows coastal erosion can be reversed.

5. Biodiversity of Gulf of Mannar

The Gulf of Mannar is one of India’s richest marine biodiversity areas.

Habitats present:

  • Coral reefs

  • Mangroves

  • Seagrass beds

  • Mudflats

  • Sandy and rocky shores

Species present:

  • 117 coral species

  • 450 fish species

  • Dugong (sea cow)

  • Whale shark

  • Sea turtles

  • Dolphins

Dugong habitat makes the region globally important.

Coral reefs are important because they protect coasts, support fish breeding, and maintain marine ecosystems.

6. Why This Case Study Is Important for UPSC

This topic connects with many current affairs.

Development vs environment example:

India-Sri Lanka fishing dispute:

  • Bottom trawling near Katchatheevu damages coral reefs.

IUCN priority habitats in India:

  • Trans-Himalaya

  • Western Ghats

  • Sundarbans

This case shows how conservation and development can be balanced.

7. Important Concepts to Remember

Artificial Reef
Man-made underwater structure to restore marine life.

Marine Biosphere Reserve
UNESCO programme to protect biodiversity with sustainable use.

Coastal Regulation Zone
Rules to protect coastal ecosystems.

Nature-Based Solution
Using natural methods to solve environmental problems.

8. Key Facts for Quick Revision

  • Gulf of Mannar between India and Sri Lanka.

  • Coromandel Coast location.

  • Asia’s first Marine Biosphere Reserve.

  • Van Island is one of 21 islands.

  • Artificial reefs used for restoration.

  • Dugong habitat present.

  • Marine National Park declared in 1982.

9. Possible UPSC Prelims Questions

  1. Gulf of Mannar lies between which countries?
    India and Sri Lanka.

  2. Which coast lies near Gulf of Mannar?
    Coromandel Coast.

  3. Artificial reefs are used mainly for what?
    Coastal protection and biodiversity restoration.

  4. Gulf of Mannar is habitat of which endangered animal?
    Dugong.

10. Use in UPSC Mains Answers

You can use Van Island as a case study in answers about:

Example line for answer:
Van Island restoration shows that scientific innovation can restore biodiversity while improving livelihoods.

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