Brian Barton
Marine plastic pollution is a pressing global issue that affects a wide range of marine life, including seabirds. It is estimated that up to 1 million seabirds die each year from ingesting plastic, and this number is expected to grow. The impact of plastic pollution on seabirds is twofold: they mistake floating plastic for prey, and they use marine debris to build their nests. This issue has grown exponentially, with recent studies showing that almost all seabird species will be ingesting plastic by 2050.
| Characteristics | Values |
|---|---|
| Number of seabirds dying from water pollution each year | 1 million |
| Percentage of birds with plastic in their stomachs in 1960 | ><co: 0,5>5%</co: 0,5> |
| Percentage of birds with plastic in their stomachs in 1980 | 80% |
| Expected percentage of birds ingesting plastic by 2050 | 99% |
| Number of marine animals dying from plastic pollution each year | 100,000 |
| Number of seabirds killed by plastic pollution in 2010, per capita | 145 seabirds killed per million people |
| Number of wild fish caught per year | 0.97 to 2.7 trillion |
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What You'll Learn
An estimated 1 million seabirds die from plastic pollution each year
Seabirds are attracted to plastic due to its resemblance to prey. For example, the smell of krill feeding on the algae that coats marine plastic debris is similar to natural scents that many seabirds follow when hunting for food. Additionally, the lightweight nature of plastic means that it floats, making it more likely to be consumed by seabird species that feed by skimming low over the water, such as albatrosses. In fact, approximately one-third of albatross chicks die each year from ingesting plastic that has been mistaken for prey by their parents.
The impact of plastic pollution on seabirds is not limited to ingestion and entanglement. The presence of plastic in seabirds' stomachs can also affect their kidney function, leading to higher concentrations of uric acid and negatively impacting cholesterol and enzyme levels. Furthermore, some seabirds use marine debris, such as fishing lines and synthetic ropes, to construct their nests, which can have detrimental consequences.
The threat of plastic pollution to seabirds is global and pervasive, with plastic debris found in remote locations thousands of miles from land. This is due to winds and currents that can carry plastic thousands of kilometres from its original source. As a result, even locations far from human activity, such as Midway Atoll, located over 2,000 miles from the nearest continent, are severely affected by plastic pollution.
To address this issue, it is essential to recognise the widespread consequences of human actions and take steps to mitigate them. This can include participating in beach cleanups, volunteering at local events to remove litter from beaches and streams, and reducing the use of single-use plastics.
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Seabirds mistake plastic for prey, which they then feed to their chicks
An estimated one million seabirds die each year from water pollution. This is due to the presence of plastic in the ocean, which has grown explosively. In the 1960s, less than 5% of birds were found with plastic in their stomachs. This number increased to over 80% in 1980, and it is expected that by 2050, 99% of all seabird species will be ingesting plastic.
Seabirds mistake plastic for prey due to its lightweight nature and similar appearance and smell. Albatross species, in particular, feed by skimming low over the water and inadvertently consume plastic as a result. Brightly coloured plastic pieces are often mistaken for prey, which the adult seabirds then feed to their chicks. The chicks are unable to regurgitate the plastic pieces, and many die as a result.
In a study, scientists found that 80 to 90% of the chicks had at least one piece of plastic in their system, which may not be enough to kill them but could interfere with their development. Another study found more than 400 pieces of plastic in a single shearwater chick, sometimes accounting for 5-10% of their total body weight.
The ingestion of plastic has severe health consequences for seabirds. It can cause decay of the stomach lining, cell rupture, neurodegeneration, and higher concentrations of uric acid. It can also negatively impact their cholesterol and enzymes.
To reduce the number of seabird deaths from water pollution, it is essential to address the issue of plastic pollution in our oceans. This includes reducing plastic waste, improving recycling rates, and participating in beach clean-up efforts.
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Plastic pollution impacts the kidney function of seabirds
Seabirds are highly adapted to life on the ocean, with specialised feathers and a desalination system that allows them to drink seawater safely. However, human activities have led to severe plastic pollution in the oceans, threatening the survival of these birds. An estimated 15-51 trillion pieces of plastic are currently in the oceans, with 8-10 million tons added annually. The impact of this pollution is felt by seabirds, with hundreds of thousands of them ingesting plastic each year. This plastic ingestion has various effects on seabirds, including malnutrition, cell damage, organ dysfunction, and neurological decline.
One of the critical organs affected by plastic ingestion is the kidneys. Studies have shown that the presence of plastic in seabirds' systems impacts their kidney function, leading to higher concentrations of uric acid and negatively affecting their cholesterol and enzyme levels. This kidney dysfunction can have far-reaching consequences for the birds' overall health and survival.
The problem of plastic pollution in seabirds is not new. As early as the 1960s, less than 5% of birds were found to have plastic in their stomachs. However, this issue has escalated rapidly, and by 1980, over 80% of birds had plastic in their systems. This increase is alarming, and it is predicted that by 2050, 99% of all seabird species will be ingesting plastic.
The ingestion of plastic by seabirds can be attributed to several factors. Firstly, the lightweight nature of plastic means that it can be easily ingested, especially by species that skim low over the water, such as albatrosses. Additionally, the smell of krill feeding on the algae coating marine plastic debris is similar to the natural scents that many seabirds follow when hunting for food, tricking them into consuming plastic.
The impact of plastic pollution on seabird populations is severe. It is estimated that one million seabirds die each year due to plastic pollution. This figure includes albatross chicks, who ingest plastic inadvertently fed to them by their parents and are unable to regurgitate it. The remote Midway Atoll, located over 2,000 miles from the nearest continent, illustrates the devastating effects of plastic. Here, approximately one-third of albatross chicks die annually due to plastic ingestion.
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Seabirds use marine debris to build their nests
Seabirds are increasingly building their nests with marine debris, which poses a severe threat to their survival. Research has found that plastic debris is incorporated into up to 80% of seabird nests. This issue is particularly evident in the Gulf of Maine, where birds experience the harmful effects of marine debris through ingestion, nesting habitat degradation, and entanglement or entrapment.
In 2019, the National Oceanic and Atmospheric Administration (NOAA) Marine Debris Program published a Gulf of Maine Marine Debris Action Plan, calling for more research on the interactions between marine debris and wildlife. This plan was developed in response to the alarming decline in bird populations, with North America losing over three billion birds in the past 50 years.
The problem of marine debris in seabird nests is not limited to a specific region. In an uninhabited island in West Africa, researchers found anthropogenic debris in the nests of Northern Gannets from 29 colonies. Similarly, in Senegal, litter was present in 15% of Caspian tern nests and 40% of great cormorant nests, with plastic accounting for over 95% of the litter.
The sources of plastic in seabird nests vary. In some cases, it may be ingested by the birds while foraging in populated areas. However, research has shown that the types of plastic found in their diet differ from those found in their nests, suggesting that the plastic in nests may come from other sources, such as marine debris washed up on shores.
The impact of plastic pollution on seabirds is devastating. It is estimated that one million birds die each year due to plastic ingestion. This issue has grown exponentially, with less than 5% of birds found with plastic in their stomachs in the 1960s, increasing to over 80% by the 1980s. By 2050, it is predicted that 99% of seabird species and 95% of individual seabirds will have ingested plastic.
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Winds and currents carry plastic to remote locations
An estimated one million seabirds die from plastic pollution each year. This problem has grown rapidly, with less than 5% of seabirds found with plastic in their stomachs in the 1960s, increasing to over 80% by the 1980s.
Winds and ocean currents play a significant role in carrying plastic waste to remote locations, far from human populations. The lightweight nature of plastic, combined with winds and currents, allows it to travel thousands of kilometres from its original entry point into the ocean. This results in plastic pollution even in isolated areas, such as the Midway Atoll, located over 2,000 miles from the nearest continent, which faces severe plastic pollution issues.
The main source of ocean plastic pollution is land-based, with 80% of plastic in the ocean originating on land. Litter dropped on streets and improperly disposed of waste is carried by wind and rainwater into streams, rivers, and eventually drains that lead to the ocean. Once in the ocean, plastic decomposes slowly, breaking into microplastics that can be consumed by marine life, including seabirds.
Rivers are a significant pathway for plastic to reach the ocean. Coastal cities in middle-income countries are hotspots for plastic emissions, with plastic waste from these areas more likely to reach the ocean. Recent research has identified 1,000 rivers worldwide that contribute to nearly 80% of ocean plastic emissions. The probability of plastic reaching the ocean is influenced by factors such as proximity to rivers, distance to the ocean, terrain, and land use.
Additionally, plastic accumulates in subtropical oceanic areas called gyres, massive circular currents that trap floating plastic for extended periods. The Great Pacific Garbage Patch, located in the North Pacific Ocean between Hawaii and California, is a well-known example of a gyre. These gyres contribute to the widespread distribution of plastic pollution, including in remote locations.
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Frequently asked questions
It is estimated that 1 million seabirds die from plastic pollution each year.
Seabirds may ingest plastic, mistaking it for prey, or the scent of krill feeding on plastic-coated algae. This causes health problems, including impacting kidney function, and can lead to death. Seabirds may also become entangled in plastic debris and drown.
Plastic pollution in the ocean is a global issue, with plastic being carried by winds and currents to remote locations. It is estimated that 8 to 10 million tons of plastic enter the ocean each year, with concentrations reaching 580,000 pieces per km2.
The impact of plastic pollution on seabirds has increased significantly. In the 1960s, less than 5% of seabirds studied were found to have ingested plastic, but by 1980, this number had increased to over 80%. It is expected that by 2050, 99% of all seabird species will be ingesting plastic.
Reducing plastic pollution in the ocean requires a combination of individual actions and systematic changes. Individuals can reduce their plastic consumption, properly dispose of waste, and participate in beach clean-up efforts. Governments and industries need to address plastic production and implement policies to reduce plastic waste and promote recycling.
