Maya Ellison
Plastics are a growing concern for marine life and human health. As plastic waste in the ocean breaks down into microplastics, they are consumed by marine organisms, leading to bioaccumulation and biomagnification in the food chain. Bioaccumulation refers to the buildup of pollutants in an individual organism, while biomagnification describes how these pollutants increase in concentration as they move up the food chain. This process poses a significant threat to wildlife and humans, especially when contaminated seafood is consumed. The accumulation of toxic substances in top predators, including humans, can result in serious health issues such as neurological damage and reproductive disorders. Therefore, understanding the dynamics of biomagnification is crucial for developing effective conservation strategies and safeguarding ecological balance and human health.
| Characteristics | Values |
|---|---|
| How humans are affected | Humans are consuming some amount of microplastics (and even tinier nanoplastics) |
| How it enters the human body | Humans consume seafood, which includes fish and shellfish like lobster, crab, shrimp, clams, oysters, and mussels. These marine animals are opportunistic feeders that eat almost anything, including plastics. |
| Effect on marine organisms | Plastic fragments and fibres have been ingested by lugworms, amphipods, barnacles, and zooplankton. |
| Effect on humans | Scientists are unsure how microplastics are affecting humans or if they are affecting us at all. |
| Effect on the ecosystem | Microplastics can choke or kill animals. |
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What You'll Learn
Plastic additives in seafood
Plastics are formulated with various chemical additives to enhance their performance and appearance. These additives include plasticizers, fire retardants, and colorants. Over 3,200 chemical substances used as plastic additives are considered potential hazards. Phthalic acid esters (PAEs), or phthalates, are the most frequently used group of plasticizers and can make up to 60% of a product's quantity. Bisphenol A (BPA), another common additive, is used in polycarbonate plastics, epoxy resins, and food and beverage packaging.
Through plastics breakdown, plastic additives can migrate out of plastics and disperse in the marine environment, as they are not chemically bound to the polymer matrix. Once absorbed by marine organisms, degradation and metabolization of PAEs can occur. However, the metabolism of PAEs in fish species is not yet well understood.
A study on commercial fish in the Aegean and Ionian Seas found DINP (di-isononyl phthalate), a type of PAE, in the gastrointestinal tract of E. encrasicolus. The study also detected the parent diester DBP and the metabolic monoester MNBP in some samples. While the estimated daily intake and target hazard quotient (THQ) indicated a low likelihood of negative effects, the results highlight the need for further research on plastic additives in the marine environment, especially for species intended for human consumption.
Another study led by researchers at Ocean Conservancy and the University of Toronto found microplastic particles in 88% of protein food samples across 16 types, including seafood, meat, and plant-based alternatives. Microplastics were present in similar concentrations in both land- and ocean-sourced proteins. The study also found that nearly half of the identified microplastics were fibers, and about a third were plastic fragments. These findings suggest that microplastic contamination is pervasive in the food system, with potential implications for human health.
While the specific mechanisms are still being studied, the presence of plastic additives in seafood and their potential transfer to humans through the food chain is a growing area of concern. Researchers are working to understand the extent of plastic additives' contribution to the overall contaminant burden in organisms and their potential impact on human health.
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Human consumption of contaminated fish
Fish is considered an essential component of a balanced diet as it contains high-quality omega-3 fatty acids, protein, vitamins, and minerals. However, the presence of contaminants in fish has raised concerns about the risks associated with its consumption. These contaminants include methylmercury, polychlorinated biphenyls (PCBs), dioxins, pesticides, and, more recently, plastic waste.
Plastic waste in oceans and other water bodies has become a significant issue, with microplastics and their associated chemical additives contaminating marine organisms through a process known as biomagnification. This occurs when lower trophic-level organisms, such as primary producers (autotrophs) and primary consumers (herbivores), ingest microplastics directly from the water or through the consumption of contaminated prey. As these lower trophic-level organisms are consumed by higher-level tertiary and quaternary consumers, the concentration of microplastics can increase, leading to potential biomagnification.
Fish, being a part of the aquatic food chain, can accumulate plastic waste and other contaminants. These contaminants can enter the food chain through industrial waste, agricultural runoff, atmospheric deposition, and other human activities. Over time, these contaminants can accumulate in fish tissues, leading to potential health risks for humans who consume them.
The consumption of contaminated fish has been linked to adverse health effects in humans. These effects include inflammation, oxidative stress, genotoxicity, tissue damage, cytotoxicity, neurotoxicity, immune system disruption, and carcinogenesis. Additionally, vulnerable groups such as pregnant women, breastfeeding mothers, and young children are particularly susceptible to the harmful effects of contaminants in fish. It is recommended that these groups limit their intake of fish, especially certain species that may have higher levels of contamination.
The degree of contamination in fish can vary depending on the species and the growing areas. Therefore, it is important to have a comprehensive understanding of the scientific evidence regarding the risks and benefits of fish consumption. This knowledge can help individuals make informed decisions about their diet, balancing the benefits of consuming fish with the potential risks associated with contamination.
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Health risks of biomagnified pollutants
Biomagnification refers to the increase in pollutant concentration as they move up the food chain, from one trophic level to the next. This process is hazardous to the ecosystem and can have adverse effects on human health.
Pollutants enter the food chain through various human activities such as urbanization, mining, and industrialization. These activities release toxic substances into the soil, water, and air, which are then consumed or inhaled by organisms, leading to bioaccumulation. Bioaccumulation refers to the increased concentration of pollutants in an organism over time, which can result in harmful effects on both the organism and humans when they consume these organisms. For example, agricultural pesticides, insecticides, fertilizers, and fungicides contain heavy metals such as mercury, arsenic, and lead, which cause health issues in both aquatic organisms and humans.
Furthermore, the use of wastewater for irrigation leads to the accumulation of metals in the soil, which are then taken up by crops, vegetables, and milk. Rice, for instance, is particularly susceptible to metal accumulation due to its high water consumption and exposure to metals from the germination stage.
The biomagnification of pollutants poses significant risks to human health. As primary consumers, such as herbivores and zooplankton, consume contaminated plants or organisms, the pollutants accumulate in their bodies. These primary consumers are then eaten by secondary consumers, such as carnivores and omnivores, leading to a further increase in pollutant concentration. This process continues up the food chain, with top predators, such as tertiary and quaternary consumers, having the highest levels of accumulated pollutants. When humans consume these lower or higher trophic-level organisms, they are at risk of ingesting harmful substances that have bioaccumulated.
While there is limited evidence of microplastic biomagnification, the moderate to high bioaccumulation of microplastics in some lower trophic-level marine organisms still poses health risks to humans who consume seafood. The complex nature of marine food webs and the variety of organisms and feeding strategies make it challenging to predict the exact health risks, but the potential for biomagnification of contaminants in seafood intended for human consumption is a cause for concern.
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Trophic magnification factor (TMF) regression analyses
TMF regression analyses are applied to study the bioaccumulation of MPs in marine organisms, including primary producers (trophic level 1) and consumers (trophic levels 2 to 4.5). By examining the dietary transference of MPs, TMF assessments help identify the biomagnification potential of these contaminants. The analyses consider interspecies intrinsic ecological and organismal properties, such as thermoregulation, reproductive status, migration, and age, which can influence the TMF regression slope.
The TMF is calculated as the coefficient, or slope, of a regression between the log concentration of a contaminant in an organism and its trophic position. This metric provides valuable information for regulatory decision-making, helping to minimize assessment errors. TMF-focused assessments are especially useful when field data is unavailable, as they can estimate TMF values and relationships between physical-chemical properties and TMF values.
TMF regression analyses have been applied to study the bioaccumulation and biomagnification of MPs in marine environments. For example, a study on the Northeastern Pacific food web found that the TMF regression analyses showed a lack of evidence for trophic magnification, indicating no changes in MP concentrations as the trophic level increased. This suggests trophic dilution, where MP concentrations decrease as the trophic level increases.
However, it is important to note that the TMF is not the sole metric for understanding biomagnification. Other measures, such as biota-sediment accumulation factors (BSAF(TL)s) and bioaccumulation factors (BAF(TL)s), are also recommended to augment TMF assessments and provide a more comprehensive understanding of biomagnification processes. These additional metrics help to minimize errors and ensure accurate predictions of biomagnification potential.
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Community efforts to minimise plastic trash
Plastic waste is a global crisis that affects people and communities worldwide. It is polluting the air, water, and soil that people and nature need to survive. The good news is that communities are taking action to minimise plastic trash and are making a real difference.
Community-led initiatives are actions taken by groups of people to improve their local environment. They are essential to reducing plastic waste and can take the form of grassroots campaigns, which are spontaneous and involve those directly affected by the issue. For example, the Alliance to End Plastic Waste supports the Centre for Regenerative Design and Collaboration (CRDC), which converts mixed plastics into a construction material. The Alliance also collaborates with local waste collectors to enhance waste management and support informal workers, such as in Nepal, where they work with Creasion to overcome tough terrain and poor infrastructure.
Community education is a powerful tool in the fight against plastic waste. Teaching young people about the dangers of plastic waste and how to reduce, reuse, and recycle is a promising start. For instance, the WWF's Plastic Free Schools programme works with educational institutions to reduce plastic pollution by replacing plastic items like straws, bags, and bottles. Similarly, nature-based ecological education in schools can teach students about the environmental impact of plastic waste.
Community members can also take individual action to reduce plastic waste. People can be encouraged to recycle, with education provided on which plastics can and cannot be recycled. Social media and email campaigns, blogs, and local television stations can be used to spread awareness. Individuals can also reduce their plastic consumption by carrying reusable bottles, bags, and containers, and choosing products with minimal packaging.
Community clean-up projects can also make a significant impact. For example, clean-up projects along the Mekong River, one of the most polluted rivers in the world, can help reduce the amount of plastic waste entering the ocean. By empowering communities and providing education, these projects can simultaneously improve the quality of life for local communities and the global environment.
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Frequently asked questions
Biomagnification refers to the process by which toxic substances, such as plastics, become concentrated as they move up the food chain.
As humans are at the top of the food chain, we are exposed to large amounts of contaminants that have biomagnified throughout the food chain before reaching our plates. This consumption can lead to neurological and physiological disorders.
The primary sources of these toxic substances include industrial activities such as manufacturing, agriculture, and the use of pesticides. They can also come from natural sources such as volcanic eruptions and wildfires.
To reduce the impact of biomagnification of plastics on humans, it is important to reduce the use of plastics and dispose of them properly. Additionally, individuals can reduce their exposure to toxic substances by eating a diet rich in fruits and vegetables and drinking clean water.
