INTRODUCTION

• Coral reefs, also called ‘Rainforest of the Sea’, plays a crucial role in supporting marine ecosystems and sustaining coastal economies, providing shelter, food, and breeding grounds for a quarter of all marine life. 

• However, these vital ecosystems are under significant threat, with more than 70% of the world's corals facing immediate dangers from a mix of local and global pressures.

WHAT IS CORAL REEF

• Coral reefs are formations made of calcium carbonate skeletons secreted by coral polyps, related to sea anemones and jellyfish. 

• They live in colonies, building exoskeletons that form the reef structure. 

• Reefs thrive in warm, shallow, and clear waters, typically between 23 and 29 degrees Celsius, where there's ample sunlight. 

• Coral polyps have a symbiotic relationship with photosynthetic algae called zooxanthellae, which provide nutrients through photosynthesis in exchange for shelter and sunlight.

SIGNIFICANCE

• Diverse Marine Life:

• The Great Barrier Reef hosts over 400 coral species, 1,500 fish species, 4,000 mollusc species, and six of the world's seven sea turtle species.

• Undiscovered Species:

• Research indicates that millions of undiscovered species of organisms might be living in and around coral reefs, highlighting their significance for marine biodiversity.

• Economic Value:

• Coral reefs provide economic goods and services valued at approximately $375 billion annually. 

• These services include tourism, fishing, and coastal protection.

• Human Dependence:

• More than 500 million people worldwide rely on coral reefs for food, income, and protection against storms and floods. 

• Reefs act as natural barriers, absorbing up to 97% of the energy from waves, storms, and floods.

• Coastal Protection:

• Coral reefs play a crucial role in preventing loss of life, property damage, and soil erosion by absorbing the impact of waves and storms.

CORAL REGION OF THE WORLD

CORAL REGION OF INDIA

REASONS FOR THREAT

• Rising Ocean Temperatures (Climate Change):

• Coral has a symbiotic relationship with microscopic algae called zooxanthellae. When water temperatures rise above a certain level, the coral expels the zooxanthellae,  losing its food source and colourful pigments

• A report by the National Oceanic and Atmospheric Administration (NOAA) indicates a 99% chance that at least one major bleaching event will occur globally each year by 2050, due to rising ocean temperatures 

• Example: 

• The Great Barrier Reef in Australia suffered its worst bleaching event ever in 2016-2017, with an estimated 70% of the reef impacted, largely due to record-breaking water temperatures.

• Disease Outbreaks:

• Rising water temperatures have been linked to the spread of Stony Coral Tissue Loss Disease, a highly contagious disease that has devastated coral reefs in the Caribbean and Florida.

• Pollution:

• Pollutants can cloud the water, reducing sunlight penetration and hindering the zooxanthellae's ability to photosynthesize. 

• Additionally, some pollutants can directly harm the coral tissue or disrupt its immune system, making it more vulnerable to stress.

• Example:

• A study published in the journal Marine Pollution Bulletin found that a combination of pollutants, including agricultural runoff and sewage, can weaken corals and make them more susceptible to bleaching.

• Changes in Salinity:

• Corals are adapted to live within a specific salinity range. 

• Drastic changes in salinity can disrupt their internal processes, making them more vulnerable to stress and potentially leading to bleaching

• Overfishing: 

• Excessive fishing can disrupt the delicate balance of the reef ecosystem, impacting the coral's ability to cope with stress.

• Example:

• Overfishing of natural predators of the crown-of-thorns starfish, can lead to population explosions.

• These outbreaks can inflict severe damage on coral reefs, leaving them vulnerable to bleaching from other stressors.

• Ocean Acidification: 

• As the ocean absorbs more carbon dioxide from the atmosphere, it becomes more acidic. This can make it harder for corals to build their calcium carbonate skeletons.

• Emerging Threats:

• Microplastics: Some Studies suggest that microplastics, tiny bits of plastic debris, may harm coral health and potentially increase their susceptibility to bleaching

• Ocean Noise Pollution: Increasing noise pollution in the oceans may disrupt vital communication and behaviour of some coral reef organisms, potentially affecting their resilience to stress.

• Trade for Aquariums:

• It is estimated that nearly 20 million tropical fish and 12 million hard corals worldwide are sold annually, the vast majority to private individuals (UN, 2003).

• UNSUSTAINABLE TOURISM:

• Tourism generates large amounts of income for host countries but when unregulated, the pressures of tourism can cause damage to the surrounding environment: 

• careless divers, badly placed boat anchors, hotels discharging untreated wastewater (polluting the water, creating sedimentation, while encouraging the growth of algae that compete with corals).

WAY FORWARD

• Addressing Climate Change:

• Global Goal: Limiting global warming to 1.5°C as outlined in the Paris Agreement is crucial for coral reef survival. 

• This requires a significant shift towards renewable energy sources and reductions in greenhouse gas emissions.

• Marine Protected Areas (MPAs):

• Establishing effectively managed MPAs can help safeguard coral reefs by restricting activities that damage them, such as overfishing and pollution.

• Example, India has 31 Marine Protected Areas (MPAs) including Gulf of Kachchh Marine National Park, Gulf of Mannar National Park, Sundarbans National Park 

• Coral Reef Restoration Techniques:

• Recent innovative techniques include coral nurseries that grow new coral colonies and fragmentation techniques where healthy coral fragments are transplanted to denuded areas.

• Reducing Pollution:

• Implementing stricter regulations on land-based pollution sources like agricultural runoff and sewage can significantly improve water quality and benefit coral health.

• Public Awareness and Community Engagement:

• Raising public awareness about the importance of coral reefs and the threats they face is critical.

• Engaging local communities in conservation efforts fosters a sense of ownership and promotes responsible practices.

• Supporting Innovative Solutions:

• Encouraging and supporting research on assisted evolution techniques that might help corals adapt to rising temperatures, or exploring technologies to mitigate ocean acidification, are ongoing areas of exploration.

• Example: The Schmidt Ocean Institute is a philanthropic organisation  that supports oceanographic research and innovation. They fund various projects focused on understanding and addressing threats to coral reefs

GLOBAL INITIATIVES:

• Coral Triangle Initiative (CTI): Southeast Asia

• Focus: Collaborative effort between six countries (Indonesia, Philippines, Timor-Leste, Malaysia, Papua New Guinea, and Solomon Islands) to conserve the Coral Triangle, the world's centre of marine biodiversity.

• Methods: Combines scientific research, community outreach programs, and management strategies to address threats and promote sustainable practices across the region.

• International Coral Reef Initiative (ICRI)

• It is a global partnership between Nations and organisations that strives to preserve coral reefs and related ecosystems around the world.

• The Initiative was founded in 1994 by eight governments: Australia, France, Japan, Jamaica, the Philippines, Sweden, the United Kingdom, and the United States of America.

• India is a member.

• Global Fund for Coral Reefs (GFCR)

• The GFCR is a blended finance instrument to mobilise action and resources to protect and restore coral reef ecosystems.

• UN Agencies, nations, philanthropies, private investors and organisations have joined the Global Fund for Coral Reefs Coalition to deliver on ecological, social and economic resilience.

INDIAN INITIATIVES:

• Coral Reef Recovery Project - Mithapur (Wildlife Trust of India):

• This project aims to establish a model public-private managed coral reef restoration effort. 

• It utilises coral transplantation and encourages natural recruitment of new corals to revive degraded reefs.

• Cherish Expeditions' Marine Conservation Programme in the Andaman and Nicobar Islands supports local communities' efforts to restore coral reefs and other conservation efforts. 

• The program partners with Reefwatch India and Laccadives to provide a transformative experience.

• Central Marine Fisheries Research Institute (CMFRI):

• CMFRI conducts research on various aspects of coral reefs, including mapping, monitoring their health, and studying the impacts of climate change and anthropogenic activities.

INNOVATIVE TECHNOLOGIES TO AID CORAL RESTORATION EFFORTS

•  Biorock Technology:

• This method uses low voltage electricity to stimulate the growth of minerals around steel structures placed on the seabed. 

• These biorock structures create a complex, electrochemically generated limestone skeleton that mimics natural reefs.

• Cryomesh technology

• Cryomesh utilises a specially designed mesh for cryopreservation (ultra-low temperature storage) of coral larvae and later reintroduced to the wild.

• The lightweight mesh allows for efficient freezing while protecting the delicate coral larvae.

• Microfragmentation:

• This technique breaks down coral fragments into even smaller pieces than traditional fragmentation. 

• These tiny fragments can then be glued or seeded onto damaged reef areas, potentially accelerating coral growth and reef recovery.

  
  

  SHORT TAKE

  • Great Barrier Reef (GBR):

  • World's largest coral reef system, located in the Coral Sea off the coast of Queensland, Australia.

  • Stretches across 2,300 km and is made up of around 3,000 individual reefs and 900 islands.

  • It is home to 400 types of coral, and 1,500 species of fish. Also home to endangered species such as the dugong and the large green turtle. 

  • The GBR is a UNESCO World Heritage site and was inscribed in 1981.

  • In 2023, the UNESCO Heritage Committee refrained from listing Australia’s Great Barrier Reef as a site "in danger" but warned that the world’s biggest coral reef ecosystem remained under "serious threat" from pollution and the warming of oceans.

  • Global mass coral bleaching event: A happens when significant coral bleaching is confirmed in the Atlantic, Indian, and Pacific Oceans. These events can have devastating consequences for coral reef ecosystems, leading to widespread coral mortality and ecosystem decline

CONCLUSION

Coral reefs, known as the "rainforests of the sea," are rich ecosystems providing habitats and breeding grounds for diverse marine life. Due to their ecological significance and mounting threats, global cooperation is crucial to protect these ecosystems a

Tags:
Polity

Keywords:
CORAL BLEACHING CORAL REEFS OCEAN OCEAN CONSERVATION CLIMATE CHANGE