Bronte Wells
Plastic pollution is a pressing issue that poses a significant threat to marine life and ecosystems. Marine animals, from small finches to large whales, are vulnerable to the harmful effects of plastic pollution in the ocean. The impact of plastic pollution on marine life is diverse and far-reaching, ranging from entanglement and ingestion to the bioaccumulation of toxic chemicals. Marine species, including fish, seabirds, sea turtles, and marine mammals, face the risk of suffocation, starvation, and internal injuries due to their interaction with plastic debris. Furthermore, microplastics, invisible to the naked eye, can be easily consumed by marine organisms, leading to toxic contamination and potential transfer of toxins to higher trophic levels in the food chain. With plastic pollution entering the ocean from thousands of sources worldwide, the need for systemic change and international cooperation to address this crisis is urgent.
| Characteristics | Values |
|---|---|
| Marine life affected | Fish, seabirds, sea turtles, marine mammals, molluscs, mussels, oysters, great white sharks, orcas, dolphins, seahorses, seals, crustaceans, micro-organisms, Hawaiian monk seals, Pacific loggerhead sea turtles, whales, finches, blue whales, apex predators |
| Impact on marine life | Entanglement, ingestion, starvation, suffocation, drowning, internal injuries, intestinal injury, toxic contamination, bioaccumulation of toxic chemicals, transfer of toxins to fatty tissues, biomagnification, endocrine disruption, developmental, neurological, reproductive and immune disorders, carcinogenicity, socio-economic impacts, negative ecological consequences, reduced biodiversity, trophic relationship disruptions, introduction of invasive species, rafting of organisms, provision of new habitats, increased pathogen growth, coral disease |
| Plastic pollution causes | Littering, industrial fishing, manufacturing processes, unsustainable development, construction, litter accumulation, debris accumulation, physical destruction of the environment |
| Plastic pollution sources | Food wrappings, plastic bags, razors, bottles, fishing gear, ropes, nets, pots, consumer goods, clothing, microfibres, face scrubs, toothpaste, textiles |
| Plastic pollution data | 8-10 million metric tons of plastic enter the ocean each year, 17% of affected species are on the IUCN Red List, microplastic levels range from 0.001-140 particles/m3 in water and 0.2-8766 particles/m3 in sediments, 13,000+ individuals from 208 species and 30,000+ individuals from 243 species have encountered ingestion and entanglement issues, 50% of sea turtles worldwide have ingested plastic, 60% of seabird species have eaten plastic, projected to increase to 99% by 2050, 914 megafaunal species are impacted by ingestion and entanglement, over 100 of which are endangered, all five ocean gyres are polluted, The Great Pacific Garbage Patch has 180 times more plastic than biomass, plastic debris outnumbers fish in the North Pacific by 12,000-24,000 tons |
| Economic impact | $6-19 billion USD per year |
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What You'll Learn
Plastic ingestion
Marine animals of all sizes, from tiny seahorses to large whales, are affected by plastic pollution in the ocean. Plastic debris in the ocean is ingested by marine animals, leading to health issues and even death.
Fish are also susceptible to plastic ingestion. They often mistake small plastic pieces, such as pellets, for food. A study summarising over 100 research papers on fish and plastic ingestion among 500 fish species found that over two-thirds had consumed plastic. Furthermore, plastic debris can break down into tiny microplastic particles, which are then ingested by smaller fish and other marine organisms. These microplastics can absorb toxins, which accumulate in the fatty tissues of the organisms that ingest them. As these smaller organisms are consumed by larger predators, the toxins bioaccumulate, leading to a higher concentration of toxins in apex predators such as orcas and great white sharks.
The impact of plastic ingestion on marine birds is also significant. Seabirds, such as albatrosses and petrels, feed on fish and other marine organisms that may have ingested plastic. As a result, the birds themselves ingest plastic, which can lead to health issues and even death. It is estimated that 60% of all seabird species have eaten plastic, and this number is predicted to increase to 99% by 2050.
The presence of plastic in the ocean is a growing problem, with an estimated 8 to 13 million tons of plastic waste entering the ocean each year. Plastic pollution has severe ecological and socio-economic impacts, threatening marine life, ecosystems, and human health. Addressing plastic pollution requires global cooperation and systemic changes to reduce plastic waste and improve waste management practices.
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Entanglement
Marine animals of all sizes, from small finches to blue whales, face the threat of entanglement in plastic waste. Large items of plastic, such as discarded fishing gear, ropes, nets, and pots, can trap and restrict the movement of marine life, leaving them vulnerable to starvation, injury, and predators.
The Mediterranean monk seal, for example, is particularly susceptible to entanglement in fishing gear, which is the second leading cause of death for this species after deliberate killing. Similarly, entanglement in ghost nets, or abandoned fishing nets, has been observed in sea turtles, with devastating consequences.
Endangered wildlife, such as Hawaiian monk seals and Pacific loggerhead sea turtles, are among the nearly 700 species that become entangled in plastic litter. This entanglement can lead to suffocation, laceration, infections, and internal injuries, causing thousands of marine animal deaths each year.
In addition to the direct physical harm caused by entanglement, trapped animals may experience stress and exhaustion from their struggle to escape. This prolonged distress can have further detrimental effects on their health and wellbeing, even if they manage to free themselves or are rescued.
Fishing gear, ropes, and nets made from plastic pose a significant entanglement threat to marine life. These synthetic materials are designed to be durable and resistant, which makes them effective for their intended use but highly dangerous when discarded or abandoned in the ocean. The durability of plastic contributes to the longevity of these entanglement risks, as the materials persist in the marine environment for extended periods.
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Impact on apex predators
Marine apex predators, such as great white sharks and orcas, face a significant threat from the cumulative impact of microplastics in the food chain and the bioaccumulation of toxic chemicals found in plastics. Microplastics, due to their small size, can be easily consumed by a wide range of marine organisms, including apex predators. These tiny plastic particles have the ability to adsorb toxins, which then accumulate in the fatty tissues of the organisms that ingest them. This process, known as biomagnification, results in a higher concentration of toxins in organisms higher up the food chain, such as apex predators.
Research has shown that orcas, for example, have some of the highest deposits of chemicals in their fatty tissues and their breast milk, which is fed to their young. This transfer of toxins to offspring can have detrimental effects on the health and development of future generations of apex predators.
Additionally, the ingestion of plastic can lead to internal injuries, intestinal damage, and even death in marine apex predators. As apex predators often consume smaller fish or marine organisms that have already ingested plastics, the plastic particles can accumulate and cause blockages or internal lacerations.
The presence of plastic pollution in the oceans also contributes to the destruction of ecosystems and the disruption of food webs. Floating plastic items can transport invasive species, leading to threats for marine ecosystems and biodiversity. As apex predators are at the top of the food chain, any disruption to the ecosystem or a decrease in the availability of their prey can have significant impacts on their survival.
Furthermore, large plastic items, such as discarded fishing gear, can entangle marine apex predators, restricting their movement, causing injuries, and making them more vulnerable to predators. This entanglement can lead to starvation, as the animals are unable to hunt effectively, and it can also increase their susceptibility to infections and other health issues.
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Microplastics entering the food chain
Microplastics are tiny particles of plastic that are often invisible to the naked eye. They can be consumed by marine animals and end up in their bodies and tissues, entering the food chain and leading to harmful consequences for the planet and all its inhabitants. Microplastics can enter the food chain through ingestion by marine animals and the contamination of their prey.
Microplastics can be ingested by a wide range of marine organisms, from small fish to large marine mammals. Fish often mistake small plastic pieces, such as pellets, for food. Molluscs such as mussels and oysters also consume microplastics while filtering seawater to feed. A study of mussels from UK waters found that 100% of the samples contained microplastic pieces. Seabirds, sea turtles, and marine mammals can ingest plastic debris, leading to issues such as suffocation, internal injuries, and starvation. Research indicates that half of the sea turtles worldwide have ingested plastic, and plastic ingestion has also been observed in seabirds, with an estimated 60% of seabird species having consumed plastic.
Microplastics can also enter the food chain through the contamination of prey. As microplastics are consumed by smaller organisms, they can accumulate in their bodies and be transferred up the food chain to larger predators. This process is known as biomagnification, where chemicals build up in the fatty tissues of animals that have eaten contaminated species. The higher up the food chain, the greater the concentration of toxins. Apex predators, such as great white sharks and orcas, are particularly vulnerable to the cumulative impact of microplastics and the bioaccumulation of toxic chemicals.
The presence of microplastics in the food chain has widespread consequences. Microplastics have been found in drinking water, salt, beer, and soil where vegetables are grown, indicating their entry into the human food chain. Plastic materials can affect the endocrine system, causing developmental, neurological, reproductive, and immune disorders. The economic impacts of plastic pollution are also significant, affecting industries such as tourism, fisheries, and aquaculture.
The durability of plastic contributes to the persistence of microplastics in the environment. Plastic can take hundreds of years to fully decompose, and even when it breaks down into smaller particles, it continues to pose a threat by entering the food chain. The interconnectedness of aquatic ecosystems with the terrestrial environment further highlights the far-reaching impacts of microplastic pollution.
Addressing the issue of microplastics entering the food chain requires a multifaceted approach. Preventing plastic leakage into the natural environment, improving waste management practices, and promoting the reuse, repurposing, and recycling of plastics can help reduce the presence of microplastics in marine ecosystems and, consequently, the food chain.
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Human health implications
Plastic pollution in the ocean is a pressing issue that poses risks to human health. The ingestion of contaminated seafood is a direct pathway for plastic and associated toxins to enter the human body. Research has found microplastics in the blood, lungs, and even faeces of humans. These tiny particles have the potential to impact our health, but the full extent of their harm is not yet known.
Microplastics in the ocean are a significant concern. They are invisible to the naked eye, making them easy for marine organisms to consume. Over two-thirds of studied fish species have consumed plastic, and microplastics have been found in seafood destined for human consumption, including fish, shrimp, and mussels. A study of mussels from UK waters found that 100% of samples contained microplastic pieces. As humans are at the top of the food chain, these microplastics can accumulate in our bodies through the ingestion of contaminated seafood.
The accumulation of toxic chemicals in plastics and their ability to adsorb additional toxins from the environment further exacerbates the health risks associated with plastic ingestion. A single plastic particle can adsorb up to one million times more toxic chemicals than the surrounding water. These toxins can transfer to the fatty tissues of organisms that ingest them, including humans. The long-term health effects of microplastic ingestion are not yet fully understood, but they pose a potential risk that requires further investigation.
In addition to the direct health impacts of ingesting contaminated seafood, plastic pollution in the ocean also has indirect effects on human health. Scuba divers, for example, face severe health risks from becoming entangled in discarded fishing nets. The accumulation of mega-size marine plastic debris in the ocean also increases the risk of accidents and loss of life. Plastic pollution on beaches and in ocean systems has been linked to negative impacts on mental health, with potential effects on stress, anger, and tension levels in humans.
The presence of plastic debris in coastal and marine environments can also affect human activities and the economy. It negatively impacts tourism, with polluted seawater and beaches affecting recreational activities and the health of tourists and residents. Plastic pollution also influences commercial fisheries, shipping, and the national economy. These socio-economic consequences can have indirect effects on human health and well-being. Addressing plastic pollution requires a global response to mitigate these risks and protect human health.
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Frequently asked questions
Plastic pollution has a detrimental impact on marine life, ecosystems, and the environment. It is estimated that 8 to 10 million metric tons of plastic end up in the ocean each year, with plastic making up 80% of all marine pollution. Marine animals such as fish, seabirds, turtles, and marine mammals are affected by plastic pollution through ingestion and entanglement, leading to health issues and even death. Plastic pollution also disrupts the food chain, with microplastics accumulating toxic chemicals and transferring them to organisms that ingest them.
Plastic pollution has far-reaching effects on marine ecosystems. Floating plastic items can transport invasive species, threatening biodiversity and the food web. Additionally, plastic waste encourages the growth of pathogens in the ocean, increasing the likelihood of disease transmission among marine organisms.
The yearly economic costs of plastic pollution in the ocean are estimated to be between $6-19 billion USD. These costs are incurred through impacts on tourism, fisheries, aquaculture, and government-led cleanups. Plastic pollution also affects socioeconomic aspects, including tourism, fisheries, shipping, and human health.
Plastic leaks into the ocean from various sources worldwide, primarily due to littering and improper waste management. Disposable plastic items, such as food wrappings, plastic bags, bottles, and industrial fishing waste, are often not disposed of properly and eventually make their way into waterways and the ocean.
