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Coral Bleaching

Coral Bleaching

Coral bleaching occurs when there are changes in temperature, light, or nutrients. Corals expel the symbiotic algae living in their tissues. This causes them to turn white.

Once these corals die, reefs rarely come back. Few corals survive, they struggle to reproduce, and entire reef ecosystems deteriorate.

In 1998, 2002, 2016, 2017, 2020, 2022, and 2024 mass coral bleaching events have occurred on the Great Barrier Reef.

Recovery from high temperatures causing stress to coral is possible if sea surface temperatures return to normal swiftly.

Scientists say that the increased frequency of bleaching events is driven by global warming.

The 2024 bleaching event was most intense at the southern end of the reef, where corals had not suffered marine heatwaves before.

“Unless we see a significant drop off in temperatures in the next few weeks, the risk of significant coral mortality is high,” Richard Leck, WWF-Australia’s Head of Oceans, said in a statement.

Australia’s climate has already warmed 1.47°C over the past century.

A report by the Australian Academy of Science said if Earth warmed a further 2°C, only 1 per cent of corals would survive.


Q: What is coral bleaching?

A: Coral bleaching is a phenomenon where corals lose their vibrant colours and turn white due to stress, such as high water temperatures, pollution, or other environmental factors. This stress causes the corals to expel the algae living in their tissues, which leads to the loss of colour and nutrients.

Q: Why is coral bleaching a concern?

A: Coral bleaching is a concern because it can lead to the death of coral reefs, which are important ecosystems that support a diverse range of marine life. When corals bleach and die, it disrupts the entire marine ecosystem, impacting fish populations, coastal communities, and tourism.

Q: What causes coral bleaching?

A: Coral bleaching is primarily caused by high water temperatures, which can stress the corals and cause them to expel the algae living in their tissues. Other factors that can contribute to coral bleaching include pollution, overfishing, sedimentation, and ocean acidification.

Q: How can we help prevent coral bleaching?

A: To help prevent coral bleaching, we can take actions to reduce our carbon footprint and combat climate change, as rising water temperatures are a major factor in coral bleaching. Additionally, we can reduce pollution, practice sustainable fishing practices, and protect coral reefs through conservation efforts.

Q: Can coral reefs recover from bleaching events?

A: Coral reefs can recover from bleaching events if the stress is temporary and the corals are able to regain their algae and nutrients. However, if the stress is prolonged or severe, the corals may die, leading to long-term damage to the reef ecosystem.

Q: What are some initiatives to protect coral reefs from bleaching?

A: Initiatives to protect coral reefs from bleaching include establishing marine protected areas, reducing pollution and sedimentation, promoting sustainable fishing practices, monitoring coral health, and raising awareness about the importance of coral reefs and the threats they face. Collaboration between governments, scientists, conservation organizations, and local communities is essential to protect and preserve coral reefs.

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