Chloe Zhang
Marine animals are increasingly ingesting plastic, which is having devastating effects on their health. The plastic in the ocean is often mistaken for food, and can cause blockages, cuts, and starvation. It can also release toxic contaminants into the animals' bloodstream. With an estimated 100,000 marine animals dying each year from plastic ingestion, it is important to understand how this is impacting marine wildlife and what can be done to prevent further harm. Marine debris, such as plastic, has been found in the stomachs of various marine animals, including whales, birds, fish, and turtles, and is a growing concern for the health of hundreds of marine species.
| Characteristics | Values |
|---|---|
| How marine animals ingest plastic | Marine animals may directly eat plastic marine debris, or they may eat prey that already has a belly full of plastic marine debris. |
| Plastic characteristics that attract marine animals | Color, size, or shape. Plastic may smell like food to some marine animals, and algae growing on plastic in the sea can confuse animals that rely on their sense of smell to hunt for food. |
| Marine animals that ingest plastic | Plankton, shellfish, birds, fish, marine mammals, sea turtles, baleen whales, mussels, oysters, albatrosses, fulmars, shearwaters, flesh-footed shearwaters, anchovies, odontocetes (toothed whales), manatees, seals, dolphins, beaked whales, sperm whales, pilot whales, sea cucumbers, invertebrates, invertebrates without a backbone, invertebrates with a backbone, invertebrates that dig into foam floats, invertebrates that increase the breakdown of plastic marine debris, invertebrates that release toxins into the bodies of animals that eat them, invertebrates that absorb toxins, shrimp-like creatures |
| Impact of plastic ingestion on marine animals | Blockages, cuts, starvation, poisoning, internal bleeding, intestinal blockage, lethargy, reduced urge to eat, difficulty getting nutrients, death |
| Impact of plastic ingestion on humans | When marine animals consume chemical-laden microplastics, and we consume those animals, these chemicals could have harmful effects on our bodies. |
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What You'll Learn
- Marine animals mistake plastic for food due to its colour, size, shape, or smell
- Marine debris can cause cuts and blockages in the digestive system, leading to starvation and death
- Some animals are more likely to eat plastic due to their feeding behaviours and the type of prey they capture
- Plastic can carry harmful pollutants and chemicals that can be released into the animal's bloodstream
- Microplastics can act as toxin sponges, absorbing dangerous chemicals from the surrounding water
Marine animals mistake plastic for food due to its colour, size, shape, or smell
Marine animals are attracted to plastic due to its colour, size, shape, or smell, often mistaking it for food. Over 200 species of marine animals, including plankton, shellfish, birds, fish, marine mammals, and sea turtles, have been documented consuming plastic.
The characteristics of plastic debris, such as colour, size, or shape, can attract certain types of wildlife. Some animals, such as baleen whales, mussels, and oysters, filter water to consume their food and can easily ingest microplastics, or plastic pieces smaller than 5 mm. Other animals, such as birds, fish, and turtles, actively search for and capture their food and may accidentally ingest plastic marine debris while eating their prey, which may have also eaten plastic.
Colour is a factor in plastic consumption, with young turtles preferring white plastic, while seabirds called shearwaters opt for red plastic. Turtles often mistake soft, translucent plastic bags for jellyfish, and fish mistake rice-sized microplastics for the small particles they normally eat. Plastic pellets may also resemble tasty fish eggs.
Smell is another important factor in why marine animals mistake plastic for food. Seabirds like albatrosses rely primarily on their sense of smell to hunt for food, and algae growing on floating plastic releases dimethyl sulfide (DMS), a compound known to attract foraging birds, as the chemical cue emanating from plastic.
The texture and sound of plastic may also be factors in why marine animals mistake it for food, as it can smell, feel, and even sound like food to these animals.
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Marine debris can cause cuts and blockages in the digestive system, leading to starvation and death
Marine debris, especially plastic, poses a significant threat to marine animals. When ingested, plastic can cause severe harm to the digestive system, leading to starvation and death. Marine animals may directly consume plastic, mistaking it for food due to its appearance, smell, or the presence of algae. Additionally, they may indirectly ingest plastic by consuming prey that has already ingested plastic.
The sharp edges of plastic debris can cause cuts and lacerations in the digestive tract, leading to infections and internal bleeding. These injuries can be fatal, as seen in cases where plastic has perforated the intestines of animals like albatross chicks and whales. Furthermore, ingested plastic can create blockages in the digestive system, making it challenging for animals to obtain the necessary nutrients and leading to a constant feeling of fullness. This results in reduced feeding and, ultimately, starvation.
The impact of plastic ingestion varies among marine animals. For example, flesh-footed shearwaters, a type of seabird, consume more plastic relative to their body mass than any other marine animal. On the other hand, deep-diving toothed whales, such as sperm whales, pilot whales, and beaked whales, are found dead on beaches with stomachs full of plastic. These whales use echolocation to hunt for prey in deep, dark waters, and plastic may be mistaken for their usual prey due to similar acoustic properties.
The presence of plastic in the oceans is a pressing issue, with an estimated 18 billion pounds of plastic entering the oceans annually. Marine debris, including plastic, is ingested by a wide range of marine organisms, from plankton to marine mammals and sea turtles. As a result, plastic pollution has become a significant factor in the decline of seabird populations and the endangerment of hundreds of marine species.
To address this issue, it is crucial to reduce plastic consumption and properly dispose of plastic waste. By minimizing the amount of plastic entering our oceans, we can help mitigate the harmful effects of marine debris on marine life and protect the health and biodiversity of our marine ecosystems.
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Some animals are more likely to eat plastic due to their feeding behaviours and the type of prey they capture
Marine animals often mistake plastic bits floating in the ocean or lying on beaches for food. These plastics cannot be digested and cause blockages and cuts in their digestive systems, leading to infections and internal bleeding. The toxins from the plastics can also enter the animal's bloodstream, causing further health issues.
Active feeders, such as birds, fish, turtles, and toothed whales, may accidentally ingest plastic marine debris while feeding on their prey. This is because their prey may have already consumed plastic. As a result, these predators end up consuming plastic indirectly.
Additionally, certain characteristics of plastic debris, such as colour, size, or shape, can attract certain types of wildlife. Birds, for instance, may pick up small plastic pieces to build their nests, which can then be ingested by developing birds or trapped in the nests. Marine mammals, such as manatees and seals, have also been observed consuming marine debris, including microplastics and plastic sheets or bags.
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Plastic can carry harmful pollutants and chemicals that can be released into the animal's bloodstream
Marine animals ingest plastic in various ways, including directly eating plastic debris or consuming prey that has already ingested plastic. The ingestion of plastic has harmful consequences for marine wildlife, causing blockages, cuts, and internal bleeding in their digestive systems.
Plastic can carry harmful pollutants and release toxic contaminants into the animals' bloodstream. Plastics can absorb pollutants from the surrounding water and release chemicals added during production, such as those for colour or flexibility. These chemicals can enter the bodies of animals that ingest plastic, potentially leading to adverse health impacts. The specific effects of these contaminants on marine wildlife are still under investigation, but they are believed to be a factor in the decline of seabird populations.
Furthermore, the size of the plastic particles plays a crucial role in how they impact different species. Microplastics, or plastic pieces smaller than 5 mm, are more easily ingested by a range of marine life, from plankton and shellfish to birds and whales. Larger plastic items can entangle marine mammals and fish, leading to starvation, injury, and increased vulnerability to predators.
The presence of plastic in the ocean is a significant concern, as it affects a wide range of marine animals and has detrimental consequences for their health and survival. The issue is exacerbated by the fact that plastic does not degrade naturally, allowing it to accumulate in the ocean and persist in the environment.
While the full extent of the problem is still being studied, it is clear that plastic pollution poses a severe threat to marine ecosystems and the animals that inhabit them. Addressing this issue requires a combination of reduced plastic consumption, improved waste management, and the development of more environmentally friendly alternatives.
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Microplastics can act as toxin sponges, absorbing dangerous chemicals from the surrounding water
Marine animals ingest plastic accidentally while feeding, or when they eat prey that has already ingested plastic. The ingestion of plastic can cause serious health problems for these animals. Plastic debris can create cuts in the digestive system, block their digestive tract, and release toxic chemicals into the body.
Microplastics, or plastic pieces smaller than 5mm, are especially dangerous as they can be easily ingested by marine animals. To combat the threat of microplastics, scientists have developed synthetic sponges that soak them up. These sponges are made from biodegradable materials such as starch and gelatin and feature a porous structure that traps microplastics. In tests, these sponges have been shown to remove up to 90% of microplastics from water.
The design of these sponges was inspired by the filter-feeding activity of oysters, which trap particles in their gills as they pump seawater through them. The sponges work through a combination of electrostatic interactions and the physical trapping of microplastics within their pores. They can be used in various contexts, from washing machines to natural waterways, to help reduce the spread of microplastics.
While these sponges show promise as a mitigation tool, it is important to address the root cause of the problem. The massive production of plastic and its widespread use have led to global pollution, with millions of tons of plastic debris entering the marine environment each year. To protect marine life from the harmful effects of plastic ingestion, it is crucial to reduce plastic consumption and properly dispose of and recycle plastic waste.
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Frequently asked questions
Marine animals may eat plastic directly, mistaking it for prey, or they may eat plastic indirectly when they eat prey that has already ingested plastic. Some marine animals, such as sea cucumbers, are even attracted to plastic and will choose to feed on it over their regular food.
Plastic can cause blockages or cuts in the digestive system, leading to infection, internal bleeding, and death. It can also release toxic contaminants into the animal's bloodstream. In addition, plastic does not biodegrade easily and can remain intact for up to a thousand years, so the problem persists even if the animal dies and the plastic is not removed from its body.
The best way to prevent marine animals from eating plastic is to reduce plastic consumption and properly dispose of plastic waste. Individuals can do this by reducing their plastic use, reusing plastic items, recycling, and participating in coastal cleanup efforts.
