Alexei Volkov
Plastic pollution is a pressing issue that poses a significant threat to marine life, including sea turtles. Sea turtles are particularly vulnerable to the harmful effects of plastic waste due to their unique anatomy and feeding habits. Research suggests that a large proportion of sea turtles have ingested plastic, mistaking it for their natural prey or unintentionally consuming it due to the ubiquitous presence of plastic debris in their habitats. Ingesting plastic can lead to fatal blockages in their digestive systems, and even a single piece of plastic can increase the risk of mortality. Additionally, plastic pollution contributes to external dangers, such as entanglement, which can result in drowning or hinder their ability to escape predators. The impact of plastic pollution on sea turtles underscores the urgent need for global action to reduce plastic consumption, promote sustainable practices, and protect vulnerable marine species.
| Characteristics | Values |
|---|---|
| Plastic ingestion | Plastic debris in the ocean resembles jellyfish, algae, or other species that make up a large component of sea turtles' diets. |
| Research suggests that 52% of the world's turtles have eaten plastic waste. | |
| A 2015 study estimated that there are more than 15 trillion pieces of plastic trash in the ocean. | |
| A 2018 study found that a single piece of plastic exposes sea turtles to a 20%-22% chance of death. | |
| The same study found that 14 pieces of plastic meant a 50% chance of dying. | |
| Another study found that half of the juvenile turtles would be expected to die if they ingested 17 plastic items. | |
| A 2018 study showed that more than half of all sea turtles from all seven species have eaten plastic debris. | |
| A 2018 study found that young turtles are at a higher risk of dying from exposure to plastic than adults. | |
| Plastic bags, bottles, balloons, degraded buoys, packaging materials, and food wrappers all contribute to the debris ingested by sea turtles. | |
| Plastic contains toxic additives that are distributed into the water and enter the food chain. | |
| Entanglement | Sea turtles can get entangled in abandoned fishing nets, which can kill them by drowning or preventing them from escaping predators or hunting. |
| Baby turtles are among the most at risk from plastic entanglement, as it prevents them from reaching the sea. | |
| Sea turtles can also get entangled in other plastic debris, such as balloons. |
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What You'll Learn
Mistaking plastic for food
Sea turtles are eating plastic and dying as a result. Research estimates that more than half of all sea turtles have ingested plastic debris, and this rises to 90% among juvenile green sea turtles off the coast of Brazil. It is thought that the ingestion of plastic kills as many as one million sea turtles each year, accounting for around 10% of the entire sea turtle population.
Sea turtles are eating plastic because they mistake it for food. A floating plastic bag can look like a jellyfish, algae, or other species that make up a large component of a sea turtle's diet. Sea turtles do not know what plastic is, and they do not get to choose what they eat. They eat what is available to them in the ocean, and plastic waste is increasingly common.
The problem is particularly acute for young turtles, which drift and float with ocean currents, as does small, lightweight plastic. Young turtles are less selective about what they eat than adults, and they are more likely to eat plastic than sea grass and crustaceans.
The ingestion of plastic can cause blockages in the digestive system, leading to death. Sea turtles cannot vomit once they have swallowed something, so plastic can get stuck in their stomachs, preventing them from properly swallowing food. It can also cause internal injuries, which often lead to death.
The impact of plastic ingestion on sea turtles is complex, and researchers are still working to understand the full scope of the problem. However, it is clear that plastic pollution is having a devastating impact on sea turtles and urgent action is needed to address it.
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Inability to vomit
Sea turtles are unable to vomit due to their downward-facing spines, which prevent regurgitation. This means that once they have swallowed plastic, it either passes through their gut or gets stuck, leading to fatal blockages in their digestive tract.
The inability to vomit is a significant issue for sea turtles, as it increases their risk of death from ingesting plastic. A study by Dr. Britta Denise Hardesty found that if a sea turtle ingested more than 200 pieces of plastic, death was inevitable. Even ingesting 14 pieces of plastic gave a 50% chance of dying, while just one piece gave a 20% chance of mortality.
The downward-facing spines in the throats of sea turtles make it impossible for them to regurgitate any foreign objects they may have swallowed. This unique anatomical feature, while advantageous in some ways, becomes a life-threatening disadvantage when they accidentally consume plastic.
The ingested plastic can become lodged in their digestive tract, causing blockages that prevent food from passing through. As a result, the turtles may starve to death despite having a full stomach. The blockage can also lead to a buildup of gas, causing the turtles to float uncontrollably. This floating behaviour not only interferes with their ability to feed and escape predators but also exposes them to harsh weather conditions and increased risk of entanglement in marine debris.
The inability to vomit, coupled with the sea turtles' natural drifting behaviour, makes them extremely vulnerable to the harmful effects of plastic pollution in the oceans. This vulnerability highlights the urgent need to address the root cause of plastic pollution and protect these ancient marine reptiles from the deadly consequences of human activities.
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Entanglement and drowning
Sea turtles are vulnerable to entanglement in plastic debris, which can lead to drowning. Plastic bags, bottles, balloons, and fishing nets are among the common sources of entanglement. The downward-facing spines in sea turtles' throats prevent them from regurgitating and removing the ingested plastic. As a result, the plastic gets trapped in their stomachs, causing blockages and internal injuries, which can be fatal.
The accumulation of plastic at key nesting beaches poses a significant risk to baby turtles, entangling them and preventing their escape to the sea. This entanglement can also make them vulnerable to predators or hinder their ability to hunt, ultimately leading to their demise.
The impact of plastic entanglement on sea turtles is evident in research and post-mortem examinations. Studies have shown that ingesting even a single piece of plastic increases a sea turtle's risk of death, with the likelihood rising to 50% for 14 pieces. Additionally, the presence of plastic in the ocean leads to its ingestion by fish and other animals, which are then consumed by turtles, resulting in the consumption of microplastics. This further exacerbates the issue of plastic entanglement and its deadly consequences for sea turtles.
The survival of sea turtle species is threatened by plastic pollution, and the entanglement and drowning of sea turtles due to plastic waste is a pressing issue. The accumulation of plastic in the ocean, including microplastics, poses a significant risk to the health and longevity of sea turtles, emphasizing the urgent need for global action to address this environmental crisis.
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Ingesting toxic chemicals
Sea turtles are particularly vulnerable to ingesting plastic because they mistake it for food. Floating plastic bags and other debris can resemble jellyfish, algae, or other items that are part of a sea turtle's diet. Young turtles are especially at risk as they drift with ocean currents, encountering more plastic and being less selective about what they eat. The accumulation of plastic at nesting beaches also puts baby turtles in danger, as they may become entangled and prevented from reaching the sea.
The impact of ingesting plastic can be immediate or long-term. A single piece of plastic can cause a 20% chance of death, with the risk increasing to 50% for 14 pieces. For juvenile turtles, ingesting 17 plastic items is expected to lead to death. Over time, the ingested plastic can break down into smaller, more toxic pieces, increasing the danger to sea turtles and other marine life.
The consumption of plastic by sea turtles has severe consequences for their health and survival. It causes blockages in their digestive tracts, preventing them from properly swallowing food. This can lead to starvation or make them more vulnerable to predators. Additionally, the harmful decomposition of plastic inside their bodies can cause gas accumulation, resulting in floating behaviour known as "bubble butts".
The ingestion of toxic chemicals from plastic poses a significant threat to sea turtles, contributing to their declining populations. It is essential to address this issue through global action, legislation, and a reduction in single-use plastic consumption to protect sea turtles and other vulnerable marine species.
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Plastic in nesting areas
Plastic pollution on nesting beaches poses a significant threat to sea turtles, with adult sea turtles struggling to find a place to nest due to debris. Newly hatched sea turtles face an even greater challenge as they must navigate through plastic items and microplastics to reach the sea. The accumulation of plastics on nesting beaches puts baby turtles at high risk of entanglement, preventing them from reaching the ocean.
Sea turtles can become entangled in various plastic items, such as abandoned fishing gear, car tires, and other debris. Entanglement can lead to drowning, choking, limb loss, and severe injuries. The presence of discarded fishing gear, also known as "ghost nets" or "ghost gear," is particularly dangerous for sea turtles.
Plastic debris on nesting beaches can also indirectly harm sea turtles. Mother sea turtles may inadvertently lay their eggs on beaches polluted with microplastics. These tiny plastic particles can affect the nests and increase the risk of entanglement for hatchlings as they make their way to the ocean.
In addition to entanglement, ingestion of plastic is a significant concern for sea turtles. They may mistake plastic bags for jellyfish or consume plastic fragments mixed with their natural food sources. Sea turtles are attracted to the smell of marine plastics due to the organisms attached to them. Ingested plastic can cause physical damage to their intestines, lead to blockages, and create a false sense of fullness, resulting in starvation.
The impact of plastic pollution on sea turtle nesting areas highlights the urgent need for action to address this issue. It is crucial to reduce plastic waste, increase recycling efforts, and support conservation initiatives to protect sea turtles and their habitats.
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Frequently asked questions
Plastic can kill sea turtles in several ways. Turtles can mistake plastic for food and ingest it, causing blockages in their digestive system. They can also get entangled in plastic, which can prevent them from moving, hunting, or escaping predators.
Sea turtles are not able to distinguish plastic from their prey. Floating plastic bags can look like jellyfish, and plastic debris can resemble algae or other food sources.
Research suggests that ingesting even a single piece of plastic exposes sea turtles to a 20% chance of death. The risk of death increases with the amount of plastic ingested. For example, 14 pieces of plastic result in a 50% chance of dying.
All seven species of sea turtles are affected by plastic pollution. However, juvenile turtles are more vulnerable to the effects of plastic as they are less selective in what they eat and drift with ocean currents, where floating debris accumulates.
Reducing plastic consumption, especially single-use plastics, is crucial. Individuals can switch to reusable containers, support sustainable businesses, and properly dispose of waste. Governments should also take action by introducing laws to ban or tax single-use products and incentivizing sustainable practices.
