Chloe Zhang
Plastic pollution is a pressing issue that has detrimental impacts on wildlife. Plastic is toxic and does not decompose, taking hundreds of years to break down into smaller pieces that can be ingested by animals. Marine animals are particularly vulnerable to plastic entanglement and ingestion, with an estimated 100,000 marine mammals dying each year as a result. Microplastics, which are invisible to the naked eye, are easily consumed by wildlife and can adsorb toxins, transferring them to the fatty tissues of organisms. The presence of microplastics in soil, sediments, and freshwater ecosystems can also have long-term negative effects, impacting earthworm fitness and soil conditions.
| Characteristics | Values |
|---|---|
| Plastic ingestion | Can block digestive tracts, pierce internal organs, choke, and starve animals |
| Plastic debris | Does not decompose but breaks down into microplastics, which can pass through animals' digestive systems |
| Microplastics | Can cause liver and cell damage, disrupt reproductive systems, affect animal behaviour, and impact population dynamics |
| Large plastic items | Can entangle marine mammals and fish, leading to starvation, injury, and predator vulnerability |
| Discarded fishing nets | Can smother and break coral reefs, preventing healthy growth |
| Small plastic fragments | Can be mistaken for food by seabirds and other marine species, leading to suffocation, starvation, and toxic contamination |
| Chlorinated plastic | Can release harmful chemicals into the soil and groundwater |
| Ghost fishing gear | Can entangle and kill large marine mammals, such as whales, dolphins, and porpoises |
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Plastic ingestion
Microplastics, plastic particles less than five millimetres long, are of particular concern as they can pass through the digestive systems of animals and have been found in hundreds of species, including 86% of sea turtle species, 44% of seabird species, and 43% of marine mammal species. These microplastics can cause liver and cell damage and disrupt reproductive systems. They can also adsorb and transport chemicals, leading to the bioaccumulation of pollutants in animals and potentially entering the human food chain.
The ingestion of plastics has profound ecological ramifications, impacting animal behaviour, population dynamics, and ecosystem processes. The severity of the issue may have been underestimated due to the lack of visible symptoms in some cases, highlighting the need for interdisciplinary research to understand the full scope of plastic ingestion's impact on animal health and ecosystems.
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Entanglement
Plastic pollution has become a pressing issue, with global plastic pollution jumping from two million tonnes in 1950 to 348 million tonnes in 2017, and it is projected to double by 2040. Marine animals are particularly vulnerable to the dangers of plastic pollution, with entanglement being one of the primary threats.
The impact of entanglement is devastating, with an estimated 100,000 marine mammals dying annually due to plastic pollution. According to Oceana, nearly 1,800 animals from 40 different species have been entangled in plastic in US waters since 2009, with 88% of these species listed as endangered or threatened. The Hawaiian monk seal, manatees, Steller sea lions, and sea turtles are among the affected species.
The pervasiveness of plastic pollution in the oceans is alarming, with not a single square mile of surface ocean water free from it. The issue is further exacerbated by the durability of plastic, which can take hundreds to thousands of years to degrade. As a result, entanglement in plastic waste continues to be a significant threat to marine life, necessitating urgent action to address the global plastic pollution crisis.
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Microplastics
Plastic pollution is a pressing issue, with global plastic waste projected to double by 2040. This waste breaks down into microplastics, which are particles smaller than 5mm in diameter. These microplastics are pervasive, found in water, air, soil, and various living organisms, including humans and animals.
The impact of microplastics extends beyond aquatic life, with terrestrial animals also affected. Microplastics leech into the soil and water sources from landfills, leading to a decrease in species that live below the surface, such as mites, larvae, and other tiny creatures. This decline in species diversity contributes to less fertile soil and land. Chlorinated plastics, such as food packaging and medical devices, release harmful chemicals into the soil and groundwater, further exacerbating the issue.
The ecological ramifications of microplastic contamination are far-reaching, impacting animal behaviour, population dynamics, and ecosystem processes. With the potential for microplastics to enter the human food chain through animal consumption, there are significant concerns about the long-term health consequences for both animal and human health.
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Plastic in forests
Plastic pollution is a pressing issue that affects all life, from microscopic animals to large predators and even humans. Forests, which cover 40.2 million km² of land globally, are not immune to this issue.
People often dump plastic waste near or in patches of unprotected wild land, which increases the likelihood of wild animals encountering it. Animals can be negatively impacted by plastic in forests in several ways. They may become trapped in or injured by plastic, or they may accidentally consume it, leading to intestinal blockages and damage, and even death. Plastic ingestion can also cause liver and cell damage, disrupt reproductive systems, and interfere with hormone production. Furthermore, the presence of plastic can affect animal behaviour and population dynamics, as well as ecosystem processes.
Microplastics, plastic particles less than five millimetres in size, are a significant concern in forests. They can enter forest ecosystems through various pathways, including atmospheric transport, local litter, and sewage, with 80-90% of plastic particles in sewage persisting in the sludge. Microplastics can contaminate soil and water sources, leading to a decline in species that live below the surface, such as mites, larvae, and earthworms. This, in turn, can reduce soil fertility and negatively impact forest flora that depend on these species. Chlorinated plastic, such as food packaging and medical products, can release harmful chemicals into the soil and groundwater, further exacerbating the issue.
The impact of plastic in forests is far-reaching and long-lasting, with plastic taking approximately 1000 years to decompose. While protected areas like National and State Reserves safeguard some wildlife and forests, many unprotected areas remain vulnerable to the detrimental effects of plastic pollution. To mitigate these effects, it is essential to reduce plastic consumption and promote plastic reuse, preventing the circulation of plastic waste that can reach and harm forest ecosystems.
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Effects on marine life
Plastic pollution is a pressing issue that poses a severe threat to marine life. The detrimental effects of plastic waste on marine ecosystems highlight the urgent need for effective solutions. Here are some key ways in which plastics affect marine life:
Ingestion and Entanglement
Large plastic debris, such as bottles and bags, directly endanger marine animals through ingestion and entanglement. Turtles, whales, dolphins, and other marine creatures can become entangled in plastic waste, leading to injuries or death. Plastic ingestion can block digestive tracts, pierce internal organs, choke, or starve animals by creating a false sense of fullness. It can also lead to a reduction in stomach storage volume, making it difficult for animals to eat.
Microplastics and Food Chains
Plastics break down into smaller particles known as microplastics, which can be ingested by marine organisms, from zooplankton to apex predators. Due to their small size, microplastics can pass through digestive systems and accumulate in the bodies of marine animals. They have been found in various species, including sea turtles, seabirds, and marine mammals. Microplastics can cause liver and cell damage, disrupt reproductive systems, and impact population dynamics.
Vector for Toxic Chemicals
Plastics act as vectors for persistent organic pollutants (POPs) and heavy metals, which adhere to their surfaces. As plastics degrade and infiltrate marine food webs, these toxic chemicals accumulate as they move up the food chain, ultimately reaching humans who consume seafood. Chlorinated plastic, such as food packaging and medical devices, can also release harmful chemicals into the surrounding soil and groundwater, further contaminating the food chain.
Habitat Disruption
Plastic pollution disrupts marine habitats, making it challenging for some species to live and breed naturally. This disruption can lead to depletions in populations and impact the overall biodiversity of marine ecosystems.
Global Impact
Plastic pollution knows no borders, and its effects on marine life are far-reaching. With 90% of ocean pollution originating from land-based sources, it is a global concern that requires collective action and comprehensive strategies at local, national, and international levels. Reducing plastic use, improving waste management, supporting cleanups, and spreading awareness are crucial steps in mitigating the detrimental effects of plastic pollution on marine life.
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Frequently asked questions
Plastic can affect animals in a variety of ways, from entanglement and injury to ingestion and toxic contamination. It can also cause intestinal blockages and even death.
Microplastics are plastic particles less than five millimetres long. They are often invisible to the naked eye, making them easy for wildlife to consume. Microplastics can also absorb toxins, which can transfer to the fatty tissues of the organisms that ingest them.
Marine plastics are contributing to the deaths of more than 100,000 marine mammals every year. Marine animals can get entangled in plastic debris, leading to injury and mortality. They can also ingest plastic, mistaking it for food, which can cause intestinal injury and death.
