Omar Khalid
Sea turtles are one of the oldest living creatures on Earth, with origins dating back at least 110 million years. However, plastic pollution is threatening their future. An estimated 8 million metric tons of plastic enter the ocean each year, and it is expected to triple by 2040 if no urgent action is taken. This plastic pollution poses a serious threat to sea turtles, with more than half of the world's sea turtles having ingested plastic or human trash. Plastic ingestion can lead to intestinal blockage, malnutrition, and even death. Additionally, the chemicals in plastic can cause hormone-disrupting effects, leading to the feminization of sea turtle populations. The presence of plastic on beaches and in the ocean also increases the risk of entanglement and entrapment for sea turtles, which can be deadly.
| Characteristics | Values |
|---|---|
| Number of marine animals that die each year due to marine debris | Over 100 million |
| Number of sea turtles that have ingested plastic | More than half of the world's sea turtles |
| Number of sea turtle species that ingest plastic | All seven |
| Number of sea turtles that have ingested microplastics in some populations | More than 90% |
| Chance of premature death for sea turtles that ingest one piece of plastic | 1 in 5 |
| Chance of premature death for sea turtles that ingest 14 pieces of plastic | 50% |
| Number of sea turtle species that are endangered | Six out of seven |
| Number of metric tons of plastic pollution that enter the ocean per year | 11 million |
| Number of metric tons of plastic already circulating in the ocean | 150 million |
| Number of years in which plastic could outweigh fish in the ocean | 30 |
| Number of years in which plastic dumped per minute into the ocean could increase from one to four | 32 |
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What You'll Learn
- Plastic ingestion: turtles eat plastic that looks like jellyfish or smells like food
- Entanglement: turtles get trapped in plastic waste, fishing nets, and other debris
- Nesting issues: female turtles struggle to lay eggs on plastic-covered beaches
- Health issues: ingested plastic causes intestinal blockages, malnutrition, and even death
- Feminization: microplastics raise sand temperatures, causing more female hatchlings
Plastic ingestion: turtles eat plastic that looks like jellyfish or smells like food
Plastic ingestion is a significant issue for sea turtles. All seven species of sea turtles have ingested plastic, with more than half of sea turtles worldwide estimated to have eaten plastic debris. Younger turtles and species that feed primarily on the ocean's surface generally ingest the most plastic.
Sea turtles eat plastic that resembles their natural food or smells like food. For example, the endangered Galapagos green turtle's favourite food is jellyfish, and plastic bags floating in the ocean can look very similar to jellyfish. In addition, plastic bags give off a similar odour to jellyfish. This "olfactory trap" might explain why sea turtles are prone to eating and getting entangled in plastic.
Once ingested, plastic can cause intestinal blockages, leading to malnutrition, reduced growth rates, and even death. Sea turtles can also starve to death due to feeling full after swallowing plastic debris. Plastic in the gut may also damage a turtle's ability to absorb food and nutrients, weakening the animal over time.
The chemicals in plastic also pose a risk to sea turtles. Plastics contain a mixture of at least 16,000 chemicals, including about 4,200 known hazardous substances such as bisphenols (BPA), dioxins, flame retardants, PFAS, and heavy metals. These chemicals can cause various health problems, including hormone-disrupting effects that can feminize sea turtle populations and lead to infertility.
To address the issue of plastic ingestion in sea turtles, it is crucial to reduce plastic pollution and increase recycling efforts. Individuals can make a difference by reducing their plastic consumption, properly disposing of plastic waste, and volunteering in sea turtle conservation and beach cleanup programs.
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Entanglement: turtles get trapped in plastic waste, fishing nets, and other debris
Plastic waste, fishing nets, and other debris pose a serious threat to sea turtles, as they can easily become entangled in them. This issue is prevalent both on land and in the ocean, affecting sea turtles at various stages of their lives.
On nesting beaches, female sea turtles face the challenge of navigating through plastic waste to find a suitable spot to lay their eggs. The trash on these beaches can hinder their movement and make it difficult to dig the necessary holes for egg-laying. In some cases, the turtles may become entangled in the debris, trapping them and impacting their ability to reproduce.
Hatchling sea turtles also face significant risks due to entanglement. As they make their way from the nest to the sea, they must crawl through plastic waste, fishing nets, and other debris. The small size and delicate nature of the hatchlings increase the likelihood of them becoming trapped and unable to free themselves. This entanglement can prove deadly, as they may be unable to reach the ocean and succumb to exhaustion or predation.
Additionally, as sea turtles swim and migrate through the ocean, they encounter plastic waste and abandoned fishing gear. They can become entangled in this debris, hindering their movement and causing physical harm. The entanglement may also impair their ability to feed, leading to starvation and a higher risk of predation.
The impact of entanglement in plastic waste, fishing nets, and other debris on sea turtles is profound. It affects their reproductive success, survival rates, and overall well-being. With plastic pollution continuing to increase in our oceans, the threat of entanglement to sea turtles becomes more dire, underscoring the urgent need for conservation efforts and a reduction in plastic usage.
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Nesting issues: female turtles struggle to lay eggs on plastic-covered beaches
Plastic pollution is one of the most pressing environmental crises of our time. An estimated 8 million metric tons of plastic enter the ocean each year, adding to the 150 million metric tons already in the ocean. This plastic pollution poses a serious threat to sea turtles, who ingest plastic or become entangled in it, leading to health and environmental problems.
Female sea turtles are particularly vulnerable to the effects of plastic pollution when it comes to nesting and laying their eggs. Sea turtles are highly selective about their nesting spots, and they will not rest until they find a suitable location. However, with the increasing presence of plastic on beaches, female turtles are facing new challenges in their nesting process.
One of the main issues is the abundance of plastic waste on nesting beaches, which can make it difficult for female turtles to dig holes and lay their eggs. In some cases, the plastic debris may be so dense that the turtles give up on nesting altogether. This is a significant concern, as the successful reproduction of sea turtles depends on the ability of female turtles to lay their eggs.
Additionally, the presence of plastic on beaches can disorient newly hatched sea turtles as they make their way from the nest to the sea. The trash-covered beaches can confuse the turtles, causing them to get entangled or trapped in plastic items and ultimately leading to their death.
The plastic pollution on beaches also contributes to the feminization of sea turtle populations. The sex of a sea turtle is determined by the temperature of the sand surrounding its egg. Microplastics on beaches absorb heat, raising the temperature of the sand and resulting in a higher proportion of female hatchlings. On the Great Barrier Reef, for example, 99% of sea turtle hatchlings are now female due to the combined effects of plastic pollution and climate change.
To address these issues, it is crucial to reduce plastic pollution on beaches and in the ocean. This can be achieved through recycling, proper waste management, and participation in beach cleanup projects. By taking action to mitigate plastic pollution, we can help protect sea turtles and ensure the successful reproduction and survival of this ancient species.
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Health issues: ingested plastic causes intestinal blockages, malnutrition, and even death
Ingesting plastic has severe health consequences for sea turtles. It can cause intestinal blockages, malnutrition, and even death. Sea turtles often mistake plastic for food, as plastic debris can resemble jellyfish, a favourite snack of the endangered Galapagos green turtle. Plastic bags, balloons, and other plastic waste can cause fatal blockages in the digestive tracts of sea turtles, leading to starvation and death. This issue is exacerbated by the fact that the scent of plastic can be alluring to sea turtles, creating an "olfactory trap" that lures them in.
The problem of plastic ingestion is widespread among sea turtles. Studies have found that all seven species of sea turtles have ingested plastic, and estimates suggest that more than half of all sea turtles worldwide have consumed plastic debris. This ingestion of plastic can lead to intestinal blockages, causing sea turtles to feel full and subsequently starve to death despite having full stomachs. Additionally, plastic in their guts may impair their ability to absorb nutrients, leading to malnutrition and weakening the animals over time.
The presence of microplastics, tiny fragments of plastic less than five millimeters in size, further complicates the issue. Microplastics can accumulate in the digestive systems of sea turtles, leading to physical blockages and health issues. The chemicals found in plastics, such as bisphenols (BPA), dioxins, flame retardants, PFAS, and heavy metals, pose additional risks to sea turtle health. These chemicals have been linked to hormone-disrupting effects, causing feminization in sea turtle populations and potentially impacting their fertility.
The impact of plastic ingestion on sea turtle health is not limited to physical blockages and chemical hazards. It also extends to the spread of harmful bacteria. Bacteria can grow on plastic items, and when sea turtles ingest these contaminated plastics, it can lead to serious health complications and even death. The ingestion of plastic has contributed to the decline in global sea turtle populations, with hundreds of thousands of sea turtles dying annually from ocean pollution.
To address this pressing issue, it is crucial to reduce plastic pollution and its impact on sea turtles. Efforts such as beach and ocean cleanups, recycling, and proper waste management are vital to mitigating the health risks posed by ingested plastic to sea turtles.
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Feminization: microplastics raise sand temperatures, causing more female hatchlings
Sea turtles are among the oldest living creatures on Earth, with origins dating back at least 110 million years. However, plastic pollution now threatens their future. Over 100 million marine animals die each year due to marine debris, and more than half of the world's sea turtles have ingested plastic.
The issue starts even before sea turtles reach the water. Newly hatched sea turtles must navigate through piles of microplastics and plastic items to get from their nests to the sea. They can easily get entangled in plastic waste, and many die on the beach instead of making it to the ocean.
Even once they reach the water, sea turtles continue to face threats from plastic waste. They can become entangled in plastic items, from car tires to abandoned fishing gear, and this often proves deadly. They also frequently mistake plastic items for food. For example, plastic bags floating in the ocean look like jellyfish, a favourite food of the endangered Galapagos green turtle. If a turtle ingests a plastic bag, it can cause a fatal blockage in their digestive system.
One of the most concerning ways in which plastic is affecting sea turtles is by raising the temperature of the sand in which their eggs are incubated. The sex of a sea turtle is determined by the temperature of the sand surrounding its egg. Male sea turtles typically hatch in cooler parts of the nest, while females hatch in warmer sands. Microplastics have a higher specific heat than sand, so higher concentrations of microplastics in the sand can raise its temperature. This can result in more female hatchlings. On the Great Barrier Reef, for example, 99% of sea turtle hatchlings are now female.
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Frequently asked questions
Plastic affects sea turtles in a variety of ways, from ingestion to entanglement and environmental issues.
Plastic ingestion can cause intestinal blockage, malnutrition, reduced growth rates, and even death. It can also damage a turtle's ability to absorb food and nutrients, weakening the animal over time.
It is very common. According to a University of Queensland study, more than half of the world's sea turtles have ingested some form of plastic or human trash. All seven species of sea turtles are affected by this issue.
Entanglement in plastic waste can be deadly for sea turtles. They can become trapped in plastic items such as fishing nets, lines, and packaging straps, which can weigh them down and prevent them from surfacing to breathe, leading to drowning.
