Hot Topics : Coral Reefs and Coral Reef Watch (GS-1 & GS-3 Mains)
Coral Reefs and Coral Reef Watch
Question : Why is Coral Reef Watch considered crucial for coral reef conservation efforts?
Coral Reef Watch (CRW)
- Established by National Oceanic and Atmospheric Administration (NOAA) in 2000.
- Provides global analysis of sea surface temperature to identify coral reefs at risk of bleaching.
- Free online tool with remote monitoring and actionable intelligence for coral reef resilience.
Importance of Coral Reefs
- Most diverse ecosystems on Earth.
- Provide economic and societal benefits worth $9.8 trillion annually.
- Threatened by climate change, unsustainable fishing, and pollution.
Coral Reefs and Symbiotic Relationship
- Reefs are built by coral polyps with calcium carbonate.
- Zooxanthellae algae live inside corals, providing them with up to 90% of their energy through photosynthesis.
- Corals provide habitat for various marine life.
Favorable Conditions for Coral Reefs
- Temperature: 23°C to 25°C (not below 20°C or above 35°C)
- Salinity: 27% to 40%
- Depth: Shallow water, less than 50 meters (ideally)
Coral Bleaching
- Corals expel zooxanthellae due to rising water temperatures, losing color and nutrients.
- Severe bleaching leads to disease and death.
- Measured in Degree Heating Weeks (DHW).
Coral Reef Watch Updates
- Version 3.5 Thermal History product suite (1985-2023) released in January 2024.
- Bleaching Alert Levels 1-5 introduced in December 2023:
- Level 3: Risk of multi-species mortality.
- Level 4: Risk of severe, multi-species mortality.
- Level 5: Risk of near complete coral mortality (>80%).
Conclusion
- Coral Reef Watch is crucial for coral reef conservation efforts.
- Provides accurate information to scientists, policymakers, and communities for mitigating threats.