Ethan Clarke
Sea turtles are one of the oldest living creatures on Earth, dating back to when dinosaurs roamed the planet. However, their future is now threatened by plastic pollution. With an estimated 15 trillion pieces of plastic trash in the ocean and growing, plastic poses a serious risk to sea turtles and other marine life. Sea turtles can become entangled in plastic waste, leading to injuries, drowning, and death. They also ingest microplastics, which can cause blockages, internal bleeding, and starvation. The impact of plastic on sea turtle populations is significant, with a growing number of bubble butts and an alarming rate of feminization in hatchlings. Human activities, including plastic production and disposal, have tipped the scales against the survival of these ancient mariners.
| Characteristics | Values |
|---|---|
| Impact of plastic on turtles | Plastic is a major threat to sea turtles, causing population decline |
| Plastic in oceans | An estimated 8–13 million metric tons of plastic enter the ocean each year, with 150 million metric tons already in the ocean |
| Plastic in turtles' diets | All seven sea turtle species ingest plastic, with some populations having more than 90% of individuals ingesting microplastics |
| Plastic entanglement | Sea turtles can become entangled in plastic waste, such as discarded fishing gear, leading to injuries, drowning, and death |
| Plastic and sea turtle development | Sea turtles' developmental habitats are difficult to find and access, so little is known about how young turtles are impacted by plastic pollution |
| Microplastics | Microplastics are tiny fragments of plastic that are ingested by marine animals and can enter the food chain |
| Human impact on plastic pollution | Human activities, such as waste disposal and plastic production, contribute to plastic pollution in the ocean |
| Solutions to plastic pollution | Reducing single-use plastic, properly disposing of waste, and organizing cleanups can help mitigate the impact of plastic on sea turtles |
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What You'll Learn
Plastic ingestion blocks intestines, pierces intestinal walls, and causes starvation.
Plastic pollution is a significant threat to sea turtles, and it is estimated that between 5 and 13 million metric tons of plastic waste enter our oceans each year. Sea turtles have been around for over 100 million years, yet plastics pose a new and devastating threat to their survival.
Plastic ingestion by turtles is a well-documented issue, with research suggesting that 52% of the world's turtles have eaten plastic waste. This occurs when turtles mistake plastic for their natural food, such as jellyfish, or accidentally consume plastic that is present among their food. Plastic bags, in particular, can look deceptively similar to jellyfish, a staple of turtles' diets.
Once ingested, plastic can cause severe damage to a turtle's body. It can block their gastrointestinal tract, leading to gas build-up and buoyancy issues. This gas accumulation can cause turtles to float, making them vulnerable to predation, collisions with boats, dehydration, and sun exposure. The blockage can also lead to intestinal perforation, causing internal bleeding and potentially piercing other organs.
One of the most distressing consequences of plastic ingestion is the false sense of fullness it creates in turtles. Turtles that ingest plastic may neglect to seek out other food sources, ultimately starving to death. This phenomenon has been observed in rescued turtles that pass plastic and begin to eat again, only to succumb to their injuries later.
While the impact of plastic ingestion on adult turtles is significant, young turtles are even more vulnerable. Their smaller body size and the fact that they spend their early years floating with ocean currents, where plastic waste is prevalent, puts them at a higher risk of ingesting plastic.
The problem of plastic pollution in our oceans is a pressing issue that requires global attention. Efforts to reduce, prevent, and mitigate plastic pollution are crucial to protecting sea turtles and other marine life.
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Plastic entanglement injures, traps, and leads to drowning
Plastic pollution is a significant threat to sea turtles, and entanglement is one of the primary ways in which plastics harm these ancient mariners. Sea turtles can become entangled in plastic waste, such as discarded fishing gear, "ghost nets", and other debris while migrating, feeding, or nesting. This entanglement can lead to severe injuries, hinder their ability to swim, surface for air, or feed, and even result in drowning and death.
The impact of plastic entanglement on sea turtles is profound and often deadly. Young sea turtles are particularly vulnerable to entanglement as they spend their early years floating with ocean currents, living among flotsam and feeding on other organisms that float with these currents. Plastic waste transported by ocean currents converges with the turtles' natural habitat, putting them at higher risk of entanglement. This convergence creates an "ecological trap" that ensnares the turtles and endangers their lives.
The consequences of entanglement are dire. Turtles suffer serious wounds, which can lead to maiming, amputation, choking, and even death. The plastic debris can entangle their limbs, causing injuries that may be irreparable. Entanglement also affects the turtles' ability to feed properly, leading to malnutrition and, in some cases, starvation. The restriction imposed by the plastic waste can hinder their movement, making it difficult for them to swim effectively or reach the surface to breathe.
The exact number of turtles affected by plastic entanglement is challenging to determine, but it is estimated that at least 1,000 sea turtles die each year due to this issue. However, this figure is likely a gross underestimation, as many dead sea turtles are never recovered from the ocean. Some surveys indicate that 91% of entangled turtles are found dead, emphasizing the deadly nature of this issue.
The threat of plastic entanglement is not limited to sea turtles but extends to various marine animals. In the United States alone, plastic entanglement and ingestion affect approximately 1,800 marine animals, including endangered species such as Hawaiian monk seals, manatees, and Steller sea lions. The problem is exacerbated by the continuous increase in plastic production and the lack of adequate waste disposal measures. As a result, plastic pollution in the oceans is expected to surpass the weight of fish by 2050, posing an ever-growing threat to marine life.
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Microplastics are eaten by fish and enter the food chain
Plastic pollution in the ocean is a significant issue that is affecting sea turtles and many other marine species. Sea turtles, which have existed for over 100 million years, are now facing a new and devastating threat due to plastic pollution. One of the primary ways plastic harms sea turtles is by ingestion, as they can consume microplastics from their food.
Microplastics, tiny pieces of degraded plastic smaller than a fingernail, are prevalent in the ocean. Fish and other animals ingest these microplastics, and when they are eaten by predators, the microplastics are passed up the food chain. This process is known as "trophic transfer." A recent study confirmed that microplastics can indeed be passed up the food chain to fish.
Beach hoppers, for example, are affected by microplastics, and as they are a food source for birds, insects, and fish, the microplastics can accumulate in these larger animals. Gobies, which are middle-sized predators in shallow waters, consume beach hoppers and are then eaten by larger fish and seabirds, further spreading the microplastics.
The impact of microplastics on animals that directly consume them is undeniable. While some studies suggest that microplastics may not increase contamination in an obvious manner, there are concerns about the potential effects on animal behaviour and health. The toxins and chemicals associated with microplastics can accumulate in animal fat and tissue through bioaccumulation, potentially leading to health issues and altered behaviour.
The presence of microplastics in the ocean is a pressing issue, and it is essential to recognize their impact on marine life, including sea turtles, fish, and other species. While more research is needed to fully understand the long-term consequences, the potential risks to animal health and ecosystems are significant.
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Plastic pollution feminizes sea turtle populations
Sea turtles are one of the oldest living creatures on Earth, with origins dating back to at least 100 million years ago. However, plastic pollution, which is a relatively new phenomenon, has emerged as a significant threat to their survival. Plastic pollution affects sea turtles in two primary ways: ingestion and entanglement.
Ingestion of Plastics
Sea turtles ingest plastic by mistaking it for their natural food, such as a plastic bag resembling a jellyfish, or by accidentally consuming plastic present among their natural food sources. Research indicates that more than half of all sea turtles have consumed plastic. This ingestion can cause physical damage to their intestines, lead to blockages, or create a false sense of fullness, resulting in sickness or even death. The presence of microplastics in their food sources further exacerbates this issue.
Entanglement in Plastic Waste
Sea turtles can become entangled in plastic waste, such as discarded fishing gear or "ghost nets," during migration, feeding, or nesting. This entanglement can cause injuries, hinder their ability to swim, surface for air, or feed, and in severe cases, lead to drowning or death. It is estimated that at least 1,000 sea turtles die each year due to entanglement in plastic, with younger turtles being particularly vulnerable.
In addition to the direct impacts of ingestion and entanglement, plastic pollution also poses a more subtle yet significant threat to sea turtle populations—it contributes to the feminization of sea turtle hatchlings. Plastic chemicals and the temperature-raising effect of microplastics on beach sand influence the gender ratio of sea turtle hatchlings. On the Great Barrier Reef, for example, 99% of sea turtle hatchlings are now born female, raising concerns about the potential total feminization of the species, which poses a significant survival risk.
The impact of plastic pollution on sea turtles is made worse by the durability of plastics, which can last indefinitely in the environment. With an estimated 5 to 13 million metric tons of plastic waste entering our oceans annually, the accumulation of plastic waste in gyres and along coastlines poses a constant threat to sea turtles and other marine life.
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Plastic pollution impacts developmental habitats
Plastic pollution is a significant threat to sea turtles, impacting them at every stage of their lives. Sea turtles ingest plastic, mistaking it for jellyfish, and this ingestion causes intestinal blockages and internal injuries, leading to malnutrition and death. They also become entangled in plastic waste, such as discarded fishing gear, which can result in injuries, hinder their ability to swim and feed, and even lead to drowning. Young sea turtles are particularly vulnerable due to their early years spent floating with ocean currents, where they live in flotsam and consume other organisms that have also ingested plastic.
The impact of plastic pollution on the developmental habitats of sea turtles is a critical area of concern. Sea turtles have complex life histories and highly mobile behaviour, making them susceptible to plastic pollution's effects. While their developmental habitats are challenging to locate and access, limited knowledge exists about the early years of sea turtles' lives and the specific impacts of plastic pollution on these critical stages. However, it is evident that plastic pollution can affect the productivity and ecosystem health of these habitats.
The presence of plastics in the ocean is a growing problem, with an estimated 5-13 million metric tons of plastic waste entering the oceans annually. This waste accumulates in gyres and along coastlines, transported by ocean currents, and converges with the habitats of young sea turtles. Microplastics, resulting from the degradation of plastics, persist indefinitely in the environment and are consumed by marine life, further endangering sea turtles through bioaccumulation.
The degradation of key habitats is another consequence of plastic pollution. Marine turtles utilise a range of aquatic habitats, and the presence of marine plastics can lead to detrimental changes in ecosystem health. This includes sediment contamination from absorbed pollutants or leached plasticizers, impacting the physiological processes of marine turtles and other organisms.
Efforts to address plastic pollution and its impact on sea turtles are underway globally. The United Nations' Sustainable Development Goals aim to significantly reduce marine pollution by 2025, and hundreds of organisations are working to fight plastic pollution through cleanups, advocacy, and public awareness campaigns. Additionally, research is being conducted to better understand the specific impacts of plastic pollution on sea turtles' developmental habitats, with a focus on finding solutions to this pressing issue.
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Frequently asked questions
Plastic waste in the ocean is a major threat to sea turtles. Turtles can become entangled in plastic waste, such as discarded fishing gear, or ingest plastic waste, which can cause blockages in their digestive systems and lead to their death. Plastic pollution also affects the early lives of sea turtles, as newly hatched turtles have to navigate through piles of microplastics and plastic items to make it from the nest to the sea.
It is estimated that between 5 and 13 million metric tons of plastic waste enter the ocean each year, adding to the estimated 150 million metric tons already in the ocean. If this continues, it is predicted that by 2050, there will be more plastic in the ocean than fish by weight.
Individuals can reduce their use of single-use plastics, properly dispose of their waste, and pick up any loose plastic waste. Organizations are also working to fight plastic pollution through cleanups, advocacy, awareness campaigns, and finding novel ways to repurpose plastic waste.
