Sofia Martinez
Plastic production has a detrimental impact on marine biology. Marine and coastal environments are highly productive zones with rich biodiversity, but they are vulnerable to plastic waste due to their vast expanse and interconnected nature. Plastic pollution in these ecosystems has become a global crisis, with plastic debris threatening the health and well-being of marine creatures. The issue is exacerbated by the durability of plastic, which can take hundreds of years to decompose, leading to the accumulation of waste in the ocean. Marine animals face entanglement, ingestion, and toxic contamination from plastic, contributing to biodiversity loss and ecosystem degradation. Addressing plastic pollution requires systemic change, including reducing plastic production, improving waste management, and treating plastic as a hazardous pollutant.
| Characteristics | Values |
|---|---|
| Marine species affected | Marine mammals, fish, seabirds, turtles, whales, dolphins, coral reefs, seagrass beds, horseshoe crabs, monk seals, sea lions, and more |
| Impact | Entanglement, injury, ingestion, starvation, suffocation, toxic contamination, intestinal injury, mortality, ecosystem degradation, biodiversity loss, climate change |
| Plastic types | Megaplastics, macroplastics, mesoplastics, microplastics, nanoplastics |
| Plastic sources | Land runoff, discarded fishing gear, paint shed from shipping, consumer goods, industrial activities, tyre abrasion, construction, agriculture, cosmetics, textiles |
| Global initiatives | UNEA-5.2 resolution, Regional mechanisms in South America, National legislation in some countries, NGO collaborations |
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What You'll Learn
Plastic entanglement and ingestion
Plastic pollution is a pressing environmental issue, affecting marine life in various ways. One of the most significant impacts is the entanglement and ingestion of plastic by marine organisms, leading to devastating consequences.
Entanglement in plastic debris can trap and restrict the movement of marine animals, making them vulnerable to starvation, injury, and predators. Large plastic items, such as discarded fishing nets, can ensnare marine mammals, fish, and other creatures, hindering their ability to escape or hunt. This entanglement often results in severe injuries, leaving them susceptible to predators or unable to survive.
Ingestion of plastic is another critical aspect of this issue. Marine organisms may intentionally or accidentally consume plastic fragments, mistaking them for food. This ingestion can lead to toxic contamination, internal injuries, and even death. Microplastics, which are smaller than 5mm, are of particular concern as they can be ingested by a wide range of organisms, including commercial fish species and marine invertebrates. These tiny plastic particles can attract and absorb toxins, transferring them to the fatty tissues of organisms that ingest them.
The impact of plastic ingestion is widespread, affecting over 250 marine species, according to Laist (1997). It is estimated that entanglement and ingestion impact at least 914 megafaunal species, with more than 100 of them being endangered. For example, the Mediterranean monk seal's second leading cause of death is fishing gear entanglement. Additionally, plastic debris was found in the stomachs of 52% of sea turtles, and sperm whales were found to have ingested plastic ropes, foils, netting, and packaging materials.
The continuous increase in plastic production and inadequate waste management have led to a surge in plastic dumping into aquatic environments. As a result, microplastics have become a significant contaminant in both seawater and freshwater ecosystems. The sources of microplastics in freshwater systems vary, with a significant portion originating from wastewater treatment plants. The abundance of microplastics can range from above 1 million pieces per cubic meter to less than 1 piece in 100 cubic meters, depending on the location.
Addressing plastic entanglement and ingestion requires a multifaceted approach. Efforts should focus on reducing plastic usage, improving disposal methods, increasing recycling, and advocating for alternative biodegradable materials. International cooperation and legislative actions, such as bans on single-use plastics, are crucial steps towards mitigating the impact of plastic pollution on marine biology.
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Microplastics and toxins
Plastic pollution is a pressing issue that affects all land, freshwater, and marine ecosystems. Marine biology is particularly vulnerable to the harmful effects of plastic production and waste. One of the most significant concerns is the presence of microplastics and toxins in the ocean.
Microplastics are tiny plastic particles that measure less than 5 mm in size. They originate from the breakdown of larger plastic items due to factors such as solar radiation, wind, and waves. These microplastics are abundant in marine and coastal systems, where they interact with organic pollutants and metals. Due to their small size, microplastics are easily consumed by marine organisms, leading to toxic contamination. They can adsorb toxins, which then transfer to the fatty tissues of the organisms that ingest them. This toxic contamination can lead to intestinal injuries and even death, as seen in fish in the North Pacific, where plastic ingestion has resulted in the transfer of plastic up the food chain to larger fish, marine mammals, and eventually human seafood eaters.
The accumulation of microplastics in the ocean is a result of both direct and indirect sources. Direct sources include commonly manufactured commercial products such as personal care and cosmetic items. For example, face scrubs and toothpaste may contain microbeads, which are now banned in some regions. Indirect sources arise from the environmental degradation of larger plastic items, such as the discarded fishing nets that smother and break coral reefs. Over time, these larger plastics break down into smaller and smaller pieces, eventually becoming microplastics.
The impact of microplastics on marine biology is far-reaching. They can be ingested by a wide range of marine organisms, from small fish to large whales. Sea turtles, for instance, may mistake floating plastic garbage for food, leading to choking, internal injuries, or a false sense of fullness that results in starvation. Seabirds are also affected, with hundreds of thousands ingesting plastic each year. Additionally, microplastics can contribute to habitat destruction, damaging coral reefs and seagrass beds, and affecting the entire marine ecosystem.
Addressing the issue of microplastics and toxins requires a multifaceted approach. At the global level, there have been efforts towards international cooperation and the adoption of resolutions to tackle plastic pollution. Regional and national mechanisms are also in place, with some governments implementing legislation to control plastic pollution by prohibiting certain plastic products and enhancing reuse and recycling initiatives. Individual actions, such as reducing single-use plastics, proper disposal, supporting cleanups, and spreading awareness, are also crucial in mitigating the impact of microplastics on marine biology.
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Plastic waste and ecosystem degradation
Plastic waste is a significant threat to marine life, with far-reaching impacts on the health and well-being of marine creatures. Marine plastics contribute to the death of over 100,000 marine mammals annually. The size of the plastic is a major factor, with large items capturing and entangling marine mammals and fish, leading to starvation, injury, and vulnerability to predators. Discarded fishing nets also smother and damage coral reefs, hindering their healthy growth.
Small plastic fragments can float on the water surface, often mistaken for food by seabirds and other marine species, causing suffocation, starvation, and toxic contamination. Microplastics, invisible to the naked eye, are easily consumed by wildlife and can adsorb toxins, transferring them to the fatty tissues of ingesting organisms. These toxins can negatively impact the reproduction and oxygen production of Prochlorococcus, an abundant bacteria/phytoplankton in the ocean.
Plastic pollution in the ocean is a global issue, with plastic debris spreading even to uninhabited islands and the furthest reaches of the ocean. Waves and storms break down plastic into smaller pieces, making retrieval extremely challenging. Marine litter has been found in the habitats of critically endangered species, such as Hawaiian monk seals, and has led to injury and mortality in endangered Steller sea lions.
Plastic pollution is a major driver of biodiversity loss and ecosystem degradation, affecting all marine, freshwater, and land ecosystems. It also contributes to climate change and poses risks to human health, food and water safety, and economic activities. International cooperation and systemic efforts are crucial to addressing the plastic crisis, with a focus on prevention, reduction, proper disposal, cleanups, and awareness.
To protect marine ecosystems and biodiversity, it is essential to reduce plastic waste, improve waste management practices, and support global initiatives aimed at mitigating and managing plastic pollution on a global, regional, and national scale.
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Marine biodiversity loss
Plastic production has a detrimental impact on marine biology, threatening biodiversity loss and ecosystem degradation. Marine biodiversity is essential for the health and resilience of ocean ecosystems. However, plastic pollution poses a severe threat to the rich diversity of marine life, from primitive organisms like horseshoe crabs to advanced species like dolphins.
One of the primary ways plastic production contributes to marine biodiversity loss is through the ingestion of plastic by marine species. Floating plastic debris can be mistaken for food by seabirds, sea turtles, and other marine animals, leading to internal injuries, suffocation, and starvation. Research indicates that half of the sea turtles worldwide have ingested plastic, and a quarter of fish sampled in California markets contained plastic microfibers in their guts. Marine mammals, such as whales and Hawaiian monk seals, have also been found with bellies full of plastic, leading to their demise.
Another critical aspect of plastic production's impact on marine biodiversity loss is entanglement. Large plastic items, including discarded fishing nets and packing bands, can entangle marine mammals, fish, and endangered species like the Steller sea lion. This entanglement often results in injury, starvation, and increased vulnerability to predators. It disrupts the natural balance of ecosystems and can lead to population declines and even extinctions.
Additionally, plastic pollution contributes to the destruction of marine habitats. Discarded fishing nets and other plastic waste can smother and damage coral reefs and seagrass beds, hindering their healthy growth and affecting the entire ecosystem. The accumulation of plastic waste in these habitats can displace native species and alter the natural dynamics of marine communities.
The presence of microplastics, resulting from the breakdown of larger plastic items, further exacerbates the issue of marine biodiversity loss. Microplastics, invisible to the naked eye, are easily consumed by marine organisms and can adsorb toxins. These toxins can then transfer to the fatty tissues of the organisms, causing health issues and potentially impacting their reproductive capabilities.
To address marine biodiversity loss caused by plastic production, a multifaceted approach is necessary. This includes reducing plastic consumption, particularly single-use plastics, improving waste management practices, implementing policies that regulate plastic as a pollutant, and promoting recycling, repurposing, and reuse of plastic materials. International cooperation and global treaties are also essential to tackle this transboundary issue effectively.
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Global plastic treaties
Plastic production has a detrimental impact on marine biology, with plastic pollution threatening marine ecosystems and the organisms that inhabit them. Marine plastics contribute to the deaths of over 100,000 marine mammals annually, through entanglement, ingestion, and toxic contamination. Large plastic items can entangle marine mammals and fish, leading to starvation, injury, and vulnerability to predators. Discarded fishing nets can smother and damage coral reefs, hindering their healthy growth. Smaller plastic fragments can be mistaken for food by seabirds and other marine species, causing suffocation, starvation, and toxic contamination. Microplastics, invisible to the naked eye, are easily consumed by wildlife and can adsorb toxins, transferring them to the fatty tissues of organisms.
To address this global crisis, efforts have been made to establish a Global Plastics Treaty. The urgency of a UN Plastics Treaty was recognised during the first negotiating session (INC-1) in December 2022, despite differing opinions on its specific form. A "high-ambition coalition", led by Norway and Rwanda, advocated for reduced plastic production and the phase-out of certain plastic products and toxic additives. Other countries, including the US, Saudi Arabia, and some Asian nations, suggested non-binding National Action Plans. As of the third negotiating session (INC-3) in November 2023, substantive discussions took place, and the participation of Indigenous and third-sector groups was emphasised. However, industry influence and the exclusion of key stakeholders impacted progress.
The fifth negotiating session (INC-5) in November 2024 faced challenges in agreeing on measures to reduce plastic production. Over 100 countries supported Panama's proposal for production reduction, and more than 120 nations called for robust implementation measures. Despite these efforts, negotiators from over 170 countries were unable to reach a consensus. The upcoming INC-5.2 in Geneva, Switzerland, aims to continue the negotiations and advance towards a strong global plastic treaty.
The Global Plastics Treaty negotiations have been marked by a mandate for a "'zero draft", a comprehensive first draft of the treaty. This draft aims to set global rules for plastics across their entire lifecycle, from production to disposal. The treaty seeks to address plastic pollution at its source and enhance reuse and recycling with novel technologies. It is important to shift how we view and use plastic, moving away from treating it as a waste material.
The support for a global agreement to stop plastic litter has been significant, with over 156 countries expressing official backing. Civil society groups, nongovernmental organisations, and businesses have also urged UN Member States to negotiate a legally binding plastic treaty. The resolution "End plastic pollution: towards an International legally binding instrument" marks a milestone in addressing plastic pollution on a systemic level. While change may be slow, the momentum for international cooperation and the recognition of plastic pollution as a global issue provide a foundation for continued progress.
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Frequently asked questions
Plastic production affects marine biology by contributing to the pollution of marine ecosystems. Humans produce over 400 million metric tons of plastic annually, and a significant amount of this ends up in the ocean, threatening marine life.
Plastic pollution has a detrimental impact on marine life, causing entanglement, injury, and ingestion issues for marine animals. It also leads to habitat destruction, affecting the entire ecosystem.
Plastic enters the ocean through various sources, including land runoff, littering, industrial activities, and improper waste management. Once in the ocean, plastic can persist for long periods, breaking down into smaller pieces that are difficult to retrieve.
To reduce the impact, it is essential to minimize plastic leakage into the environment, improve waste management practices, increase recycling and reuse of plastics, and support global efforts to address plastic pollution through treaties and regulations.
