Sofia Martinez
Marine animals, including fish, turtles, whales, seals, birds, and plankton, have been documented consuming plastic. This is often because they mistake plastic for food. For example, turtles mistake plastic bags for jellyfish, and birds eat plastic that smells like their food. In addition, some animals, such as whales, locate their prey using sound beams, and the echo of ocean plastic is similar to their usual prey. As a result, they swallow plastic, which can cause intestinal blockage and starvation.
| Characteristics | Values |
|---|---|
| Animals that mistake plastic for food | Seabirds, Fish, Whales, Turtles, Plankton, Shellfish, Fulmars, Shearwaters, Sea cucumbers, Camels, Dolphins, Manatees, Seals, and many more |
| Reasoning | Plastic smells, looks, feels, or sounds like food; some animals are passive feeders, and unintentionally eat microplastics with their food; some animals are active feeders and ingest plastic while searching for and capturing their food |
| Examples | Sea turtles mistake plastic bags for jellyfish; young turtles prefer white plastic, while shearwaters opt for red plastic; albatrosses mistake plastic for squid; whales mistake plastic for their usual prey of squid and gelatinous creatures |
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What You'll Learn
Plastic smells like food to marine animals
Marine animals, including fish, turtles, whales, seals, and birds, have been documented consuming plastic. A recent study has shed light on why so many marine animals are gobbling up plastic marine debris. It turns out that plastic doesn't just look like food, it also smells, feels, and sounds like food to marine animals.
Algae, which is consumed by krill (a small crustacean that is the primary food source for many seabirds), breaks down in the ocean and emits a sulfur odor known as dimethyl sulfide (DMS). Seabirds in search of krill have learned to associate this odor with their feeding grounds. As it turns out, floating plastic debris provides the perfect platform for algae to thrive. When the algae break down, they release the DMS odor, which attracts seabirds, leading them into an "olfactory trap."
In addition to seabirds, other marine animals, including fish, are also attracted to the smell of plastic. Plastic pellets, for example, resemble tasty fish eggs, providing another explanation for why animals are consuming plastic. Furthermore, the sense of smell is particularly important for burrow-nesting birds, such as albatrosses, petrels, and shearwaters, which are among the birds most affected by plastic consumption.
The study of how odors play a role in marine animals' consumption of plastic is the first of its kind, providing important insights into why marine animals are eating plastic. It is crucial to understand the sensory and perceptive abilities of marine animals to address the issue of plastic consumption effectively.
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Plastic looks like food to marine animals
Marine animals are highly accomplished hunters and foragers, with senses honed by millennia of evolution to target a very narrow range of prey items. However, plastic has become a part of their diet, with over 180 species of marine animals documented consuming plastic. Marine animals do not understand the threats of plastic pollution, and it is estimated that 100,000 of them die from plastic ingestion or entanglement each year.
Plastic not only looks like food, but it also smells, feels, and sounds like food to marine animals. For example, plastic pellets resemble tasty fish eggs, and soft, translucent plastic bags are often mistaken for jellyfish by sea turtles. Seabirds, such as albatrosses, petrels, and shearwaters, are attracted to the smell of dimethyl sulfide (DMS) produced by algae growing on floating plastic. When this algae is eaten by krill, a major marine food source, it releases DMS, attracting birds and fish that then consume the plastic instead of the krill.
The size and shape of plastic particles can also make them more appealing to certain marine animals. For sea cucumbers, plastic particles may be larger and easier to grab with their feeding tentacles than conventional food items. Zooplankton, which are designed to feed on particles of a certain size, may mistake plastic particles for food if they fall within a certain size range.
Additionally, colour may play a role in plastic consumption, with young turtles preferring white plastic and shearwaters opting for red plastic. While the smell of plastic may be the primary attractant, the way plastic looks can add another layer, making it more likely to be consumed by marine animals.
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Plastic feels like food to marine animals
Marine animals are attracted to plastic because it looks, feels, and smells like food. Plastic debris provides the perfect platform for algae to grow on. As the algae break down, they emit a sulfur odor known as dimethyl sulfide (DMS), which attracts sea birds looking for krill.
Albatrosses, petrels, and shearwaters are among the seabird species most affected by plastic consumption. These birds nest in underground burrows, and juvenile birds spend many months on the ground, relying heavily on their sense of smell to navigate.
Sea turtles often mistake plastic bags for jellyfish, as they can identify food through UV light vision. Older turtles preferentially target soft, translucent plastic, while young turtles prefer white plastic.
Fish consume microplastics because they resemble the small particles they normally eat. Marine mammals, such as whales and dolphins, use echolocation to locate their prey, and the echo of ocean plastic is similar to their usual prey.
The ingestion of plastic can lead to intestinal blockage and starvation in marine animals. It is estimated that 100,000 marine animals die each year from plastic ingestion or entanglement.
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Plastic sounds like food to marine animals
Marine animals are attracted to plastic because it resembles their food in terms of sight, smell, and sound.
Sight
Plastic pellets, for example, resemble tasty fish eggs. Similarly, plastic bags are often mistaken for jellyfish by sea turtles. Young turtles prefer white plastic, while seabirds called shearwaters opt for red plastic.
Smell
Algae is a primary food source for krill, a small crustacean consumed by aquatic birds. As algae break down in the ocean, they emit a stinky sulfur odor known as dimethyl sulfide (DMS). Seabirds in the hunt for krill have learned that the sulfur odor will lead them to their feeding grounds. It turns out that floating plastic debris provides the perfect platform for algae to thrive. As the algae break down, emitting the DMS odor, seabirds, following their noses in search of krill, are led into an "olfactory trap."
Sound
Aquatic mammals, such as whales and dolphins, locate their prey using sound beams or echolocation. The echo of ocean plastic is very similar to their usual prey. As a result, they swallow kilograms of plastic and eventually die of intestinal blockage and starvation.
Plastic pollution in the ocean is a significant issue, and it is important to understand why marine animals are attracted to plastic so that we can take steps to mitigate the problem.
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Plastic is deadly to animals
Albatrosses, for example, forage over thousands of kilometres in search of their preferred prey, which they pluck from the water with ease. However, they often return with nothing but plastic in their mouths. This is because algae, a primary food source for krill (which is consumed by aquatic birds), thrives on floating plastic debris. As the algae break down, they emit a sulfurous odor known as dimethyl sulfide (DMS), which attracts seabirds looking for krill.
Another example is that of turtles, which often mistake flimsy, clear plastic bags for jellyfish. Young turtles are especially indiscriminate and may confuse the plastic bags they see underwater with jellyfish due to their ability to see UV light.
The ingestion of plastic can lead to serious health problems for animals. It can get stuck in their digestive systems, causing intestinal blockage and leading to starvation. Marine mammals, such as whales and dolphins, use echolocation to locate their prey. Unfortunately, the echo of ocean plastic is very similar to their usual prey, causing them to swallow kilograms of plastic.
It is estimated that 100,000 marine animals die from plastic ingestion or entanglement each year. Plastic pollution is a significant threat to marine life, and it is our responsibility to address it.
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Frequently asked questions
Animals mistake plastic for food because it smells, looks, feels, and even sounds like food. For example, sea turtles mistake plastic bags for jellyfish, and whales mistake the echo of plastic for their usual prey.
Over 200 animal species have been documented consuming plastic, including turtles, whales, seals, birds, and fish. Seabirds are especially at risk, with virtually all species having consumed plastic. Albatrosses, fulmars, and shearwaters are among the seabird species that may be most affected by plastic consumption.
If animals are unable to regurgitate or pass plastic through their digestive system, it can cause serious health problems and even lead to death. For example, plastic can get stuck in the gizzards of seabirds, preventing them from eating a full meal. Intestinal blockage and starvation are common causes of death in whales that have ingested large amounts of plastic.
Individuals can take steps to reduce plastic waste and increase recycling efforts, such as sorting plastic waste before disposal, reusing plastic items, and participating in coastal cleanup drives.
