What is Coral Bleaching? Discuss the effects of global warming on the flora and fauna of the Lakshadweep islands.

Coral Bleaching is a phenomenon where corals lose their vibrant colors and turn white. This occurs when corals are stressed by changes in conditions such as temperature, light, or nutrients. For the Lakshadweep islands, which are entirely atoll formations (coral-based), bleaching represents an existential threat to both the land and its biological diversity.

1. The Mechanism of Coral Bleaching

Corals have a symbiotic relationship with microscopic algae called Zooxanthellae, which live in their tissues and provide food via photosynthesis:

  • Stress Trigger: When water temperatures rise even by 1°C to 2°C, the corals become stressed and expel the algae.
  • Loss of Color: Since the algae provide the coral with its color, their departure leaves the white calcium carbonate skeleton visible.
  • Mortality: Bleached corals are not dead, but they are under starvation. If the stress continues, the coral eventually dies, leading to the collapse of the entire reef structure.

2. Effects of Global Warming on Lakshadweep's Fauna

Global warming affects the animal life of the archipelago primarily through habitat destruction:

  • Loss of Biodiversity: Coral reefs are the "rainforests of the sea." Bleaching destroys the habitat for Butterflyfish, Parrotfish, and eels. When the reef dies, these species migrate or perish.
  • Impact on Fisheries: The Tuna industry, the backbone of Lakshadweep's economy, depends on a healthy marine food chain. Rising sea temperatures alter the migration patterns of fish.
  • Threat to Endangered Species: The Green Sea Turtles and Hawksbill Turtles lose their foraging grounds (sea grass and reefs), affecting their nesting success on the beaches.

3. Effects of Global Warming on Lakshadweep's Flora

The terrestrial and marine vegetation of the islands is equally vulnerable:

  • Sea Grass Degradation: Rising sea levels and temperatures lead to salinity changes that kill sea grass meadows, which are vital carbon sinks and nurseries for fish.
  • Impact on Coconut Plantations: Coconut is the primary land-based flora. Saltwater intrusion into the thin freshwater lens of the atolls (due to sea-level rise) leads to physiological wilting and reduced yield.
  • Coastal Erosion: As the protective coral reefs degrade, the islands lose their natural wave breakers. This leads to severe soil erosion, uprooting coastal vegetation like Screw Pine (Pandanus) and mangroves.

Conclusion

In conclusion, Coral Bleaching is the most visible sign of the damage caused by global warming in Lakshadweep. Because these islands are built on coral, the health of the reef is directly linked to the survival of the flora and fauna. Without urgent global climate action and local conservation efforts to build reef resilience, the unique biological and cultural heritage of Lakshadweep faces the risk of complete submergence and extinction.