Brian Barton
Coral reefs are in danger due to plastic pollution, which is a growing concern for our oceans. Plastic waste in the ocean, from microplastics to large items like fishing nets and bottles, can damage and kill coral reefs by transferring toxic chemicals, blocking sunlight, and providing a surface for disease-causing microbes to attach and infect the coral. The impact of plastic pollution on coral reefs has been studied in the Pacific Ocean, where reefs in Australia, Thailand, Indonesia, and Myanmar were found to be heavily contaminated with plastic, leading to a higher risk of disease and death. With plastic pollution contributing to the decline of coral reefs, it is essential to address this issue through reduced plastic consumption, proper waste management, and support for conservation efforts to protect these vital ecosystems.
| Characteristics | Values |
|---|---|
| Plastic debris promotes the development of diseases | The risk of disease can be up to 22 times greater on a reef polluted by plastic than on a preserved reef |
| Plastic debris can cause physical injury to coral tissues | The likelihood of disease increases from 4% to 89% when corals are in contact with plastic |
| Plastic can block sunlight from reaching coral | N/A |
| Plastic can impair the corals' growth | N/A |
| Plastic can prevent corals from capturing prey | N/A |
| Plastic can cause tissue damage to corals | N/A |
| Plastic can cause coral bleaching | N/A |
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What You'll Learn
Plastic debris promotes the development of diseases in coral reefs
Plastic pollution is killing coral reefs. A four-year study of 159 reefs in the Pacific Ocean found that reefs in Australia, Thailand, Indonesia, and Myanmar were heavily contaminated with plastic. It clings to the coral, especially branching coral, and where it clings, it sickens or kills.
Plastic debris has been shown to carry many bacteria, including some pathogens that cause coral disease. The likelihood of disease increases from 4% to 89% when corals are in contact with plastic. This risk is further exacerbated by the fact that corals may be attracted to the taste of plastic due to chemical additives, and therefore voluntarily ingest plastic.
The impact of plastic on coral reefs is particularly worrying because coral reefs are extremely biodiverse ecosystems, housing 25% of the world's biodiversity. They also provide vital fisheries and coastal defence and generate billions of dollars in socioeconomic benefits. Therefore, it is important to reduce plastic consumption, recycle properly, and ensure that plastic waste does not enter the environment.
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Plastic waste damages coral tissue
Coral reefs are incredibly important for marine biodiversity, supporting 25% of all marine species. Unfortunately, plastic pollution poses a significant threat to these ecosystems. The oceans are inundated with plastic, from large items like discarded fishing nets and plastic bags to microplastics, and this waste is having a devastating impact on coral reefs.
The impact of plastic waste on the spread of disease in corals has been studied extensively. One four-year study examined the health of over 124,000 corals on 150 reefs in the Pacific Ocean. It found that the risk of disease was up to 22 times greater on reefs polluted by plastic. Specifically, the presence of plastic waste increased the prevalence of three major coral diseases: skeletal eroding band, white syndromes, and black band disease. Another study reported that the likelihood of disease increased from 4% in reefs without plastic to 89% when plastic was present.
Microplastics also impair coral health. Long-term exposure to microplastics has been shown to hinder coral growth. While the exact mechanisms are still unknown, one theory is that ingested microplastics block corals' digestive tracts, either by creating a false sense of fullness or by preventing the digestion of their natural diet. Additionally, microplastics adhering to coral tissue may impact their ability to capture prey or cause them to expend energy removing the microplastics.
The impact of plastic pollution on coral reefs is a serious issue. By damaging coral tissue and promoting disease, plastic waste is systematically poisoning and killing corals, compromising reef structure, and reducing habitat quality for marine life. This ripple effect eventually affects human communities as well, as coral reefs provide food and livelihoods for millions of people worldwide. Therefore, it is crucial to reduce plastic pollution and protect these invaluable ecosystems.
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Microplastics impair coral growth
Coral reefs are one of the most endangered habitats due to climate change, dredging, and plastic pollution. While the impact of plastic debris on other marine life such as turtles, birds, and marine mammals has been well-studied, the impact of plastics on coral reefs has been largely ignored.
Plastic pollution is now a major problem for our planet, with about 270,000 tons of plastic floating on the surface of our oceans and much more drifting between the waters. The production of plastic has increased by 200 times since 1907, and there is now around 275 million tons of plastic waste worldwide.
Plastic does not biodegrade; instead, it breaks down into tiny particles of 5mm or less, called microplastics. When these particles reach coral reefs, they harm corals in several ways. Firstly, the constant rubbing of microplastics on corals through the action of waves and currents can wound the coral, and if these wounds become infected, they can lead to coral disease or even death. Secondly, corals may ingest microplastics, which can give them a false sense of fullness, leading to reduced food intake and low coral growth. Ingested microplastics can also block the corals' digestive tracts and cause internal damage. Thirdly, microplastics can transfer toxic chemicals and harmful microorganisms from seawater to the coral.
Scientists have studied the impact of microplastics on coral growth. In one study, northern star corals were fed their favourite meal in the wild (brine shrimp eggs) mixed with similar-sized microplastic beads. The corals chose the microplastics, which inhibited further feeding on brine shrimp eggs. In another study, corals of the genera Acropora, Pocillopora, Porites, and Heliopora were exposed to microplastics in a concentration of 200 particles L-1, relating to predicted pollution levels. The results indicated elevated energy demands in the affected species, likely due to physical contact with the microplastics. A third study by EPA scientists found that long-term exposure to microplastics impaired the corals' growth, though the exact mechanisms causing adverse effects are still unknown.
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Plastic pollution reduces habitat quality
Plastic pollution is a major threat to coral reefs, reducing the quality of their habitats in several ways. Firstly, plastics can physically damage corals by abrading and tearing their tissues, creating open wounds that expose them to disease-causing microbes. This promotes the development of diseases, with the risk increasing by up to 22 times in reefs polluted by plastic compared to healthy reefs. Specifically, plastic pollution increases the prevalence of skeletal eroding band disease, white syndromes, black band disease, growth anomalies, brown band disease, and atramentous necrosis in corals.
Secondly, plastics can impair coral growth by blocking sunlight from reaching them. This, along with the physical damage caused by plastic, weakens the corals, compromising the structural integrity of the reef. Over time, this can lead to the collapse of entire ecosystems, as the declining health of coral reefs reduces the availability of food and protection for marine wildlife, including the 25% of marine species that coral reefs support.
Additionally, microplastics can transfer toxic chemicals and harmful microorganisms to corals, acting as a chemical weapon. As natural filter feeders, corals capture tiny food particles floating in the water, but both large plastic items and microplastics can harm them. Large plastic items, such as discarded fishing nets and plastic bags, can entangle and smother corals, causing tissue damage or even death. Microplastics, on the other hand, may block the corals' digestive tracts, impacting their ability to digest their natural diet.
The impact of plastic pollution on coral reefs is far-reaching, and it is important to note that plastic waste can travel far from its source, ending up in oceans and wreaking havoc on coral ecosystems. Poor waste management practices on land account for about 80% of marine plastic pollution, as plastic waste is swept into rivers that flow into the sea. Therefore, it is crucial to reduce plastic consumption, recycle properly, and ensure that waste does not end up in the environment to protect and preserve the delicate coral reef habitats.
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Plastic waste blocks sunlight from reaching coral
Coral reefs are in danger due to plastic pollution in the oceans. Plastic waste in the oceans is becoming a significant concern, with about 270,000 tonnes of plastic floating on the ocean's surface and much more drifting at greater depths. Marine life, including coral reefs, is adversely affected by plastic pollution.
Coral reefs are essential for maintaining ocean health and supporting marine biodiversity. They are known as the "rainforests of the sea," housing 25% of all marine species. When plastic waste blocks sunlight from reaching the coral, it not only affects the coral's growth but also has a ripple effect on the entire ecosystem. As coral health declines, the availability of food and protection for marine wildlife decreases, impacting countless species that depend on healthy coral reefs.
The impact of plastic pollution on coral reefs was studied over four years, with researchers diving on 159 reefs in the Pacific. They found that reefs in Australia, Thailand, Indonesia, and Myanmar were heavily contaminated with plastic. The presence of plastic increased the likelihood of disease in corals from 4% to 89%. Plastic waste blocks the sunlight necessary for coral growth and provides a surface for disease-causing microbes to attach to, further compromising the health of coral reefs.
To protect coral reefs, it is crucial to reduce plastic consumption, properly recycle plastic waste, and ensure that it does not end up in the ocean or other water bodies. By taking these actions, we can help preserve the beauty and ecological significance of coral reefs for future generations.
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Frequently asked questions
Plastic pollution damages coral reefs by introducing disease-causing microbes into the ecosystem. Plastic waste provides an ideal surface for disease-causing microbes to attach to and get transported through the aquatic environment, eventually settling in coral reefs.
Plastic pollution can cause physical damage to coral reefs, leading to open wounds and tissue damage. It can also block sunlight from reaching the coral, hindering its growth. The presence of plastic increases the likelihood of disease in coral reefs, with some studies reporting an increase from 4% to 89%.
Plastic debris can carry pathogens and harmful microorganisms, including bacteria. When corals come into contact with plastic, they may get infected by these pathogens, leading to the development of diseases that can cause rapid coral mortality.
Plastic pollution in coral reefs originates from sources like degraded bottles, synthetic fibers from clothing, discarded fishing nets, and single-use items. Poor waste management practices on land account for about 80% of marine plastic pollution, as plastic waste gets swept away by rain and storms into rivers that flow into the sea.
Reducing plastic consumption, properly recycling it, and ensuring that waste does not end up in the environment are crucial steps to protect coral reefs. Advocating for policies that limit plastic waste and supporting NGOs fighting plastic pollution are also effective ways to address this issue.
