Greta Jimenez
Animals are extremely vulnerable to pollution, and it is estimated that plastic pollution kills over 100,000 marine mammals every year. Pollution can affect animals in a variety of ways, including entanglement, injury, ingestion, starvation, suffocation, and toxic contamination. Air pollution can also have devastating effects on animals, as they spend their entire lives outdoors, breathing in toxic air and accumulating pollutants in their tissues, which can cause organ damage, weaken their immune systems, and make them more susceptible to diseases.
| Characteristics | Values |
|---|---|
| Air pollution | Acid rain, heavy metals, persistent organic pollutants (POPs), and other toxic substances |
| Affects the quality of the environment or habitat | |
| Affects the availability and quality of the food supply | |
| Pollutants collect and are stored within the animal's tissues | |
| Pollutants enter the food chain and damage the supply and quality of food | |
| Poisons wildlife through the disruption of endocrine function, organ injury, increased vulnerability to stresses and diseases, lower reproductive success, and possible death | |
| Affects climate change and slowly destroys entire ecosystems, animals, and plants | |
| Plastic pollution | Marine mammals mistake plastic for prey and ingest it, leading to starvation or suffocation |
| Plastic pollution kills 100,000 marine mammals every year | |
| Plastic debris causes the deaths of more than a million seabirds each year | |
| Abandoned fishing gear entangles marine mammals, leading to drowning | |
| Microplastics in the food chain and the bioaccumulation of toxic chemicals found in plastics |
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What You'll Learn
- Air pollution: toxic chemicals enter the food chain, damaging food supply and quality.
- Water pollution: plastic waste in oceans entangles and injures marine animals
- Soil pollution: acid rain changes soil chemistry, making it uninhabitable for some animals
- Bioaccumulation: toxins build up in fatty tissues of animals, increasing up the food chain
- Climate change: pollution destroys ecosystems, affecting animals' habitats and food sources
Air pollution: toxic chemicals enter the food chain, damaging food supply and quality.
Animals are vulnerable to harm from air pollution, which can affect them in various ways. One significant impact is the contamination of their food supply. Air pollutants, such as heavy metals, toxic substances, and persistent organic pollutants (POPs), can enter the food chain and damage both the availability and quality of food for animals.
Heavy metals, such as mercury, can be transported through the air and deposited into water bodies. This increases the concentration of these metals in the water, posing a toxic threat to aquatic life. For example, fish may ingest these metals, which then accumulate in their tissues. When other animals or humans consume these fish, they are also exposed to the accumulated toxins, a process known as bioaccumulation.
Bioaccumulation is of particular concern for top-level predators, such as bears and eagles, as they are at the highest risk of consuming prey with accumulated toxins. These pollutants collect and increase in concentration as they move up the food chain, leading to severe health consequences for apex predators. Pollutants can disrupt endocrine function, injure organs, increase vulnerability to diseases and stresses, reduce reproductive success, and even lead to death.
Additionally, air pollution can also affect the quality of the environment or habitat in which animals live. For instance, acid rain can alter the chemistry and quality of soils and water, making it unsuitable for certain species to survive or function normally. The vulnerability of an animal to air pollution also depends on its method of respiration, whether it breathes through lungs, gills, or another form of gas exchange, such as passive diffusion across the skin.
Nonhuman animals are often the unseen victims of air pollution, with greater exposure to contaminated air than humans. They have no access to air purifiers or the ability to take refuge indoors during periods of poor air quality. As a result, they are susceptible to the harmful effects of pollutants, which can accumulate in their tissues and cause organ damage, weakened immune systems, and increased disease susceptibility.
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Water pollution: plastic waste in oceans entangles and injures marine animals
Plastic waste in oceans is a pressing issue that poses a significant threat to marine life. The durability of plastic, which prevents it from decomposing, means that it persists in the marine environment, causing harm to various animals.
One of the primary ways plastic waste in oceans harms marine animals is through entanglement. Large plastic items, such as discarded fishing nets, can entangle marine mammals, fish, and sea turtles, restricting their movement and ability to escape from predators. This often leads to starvation, injury, and increased vulnerability to predators. For example, the endangered Steller sea lion has suffered injuries and deaths due to entanglement in packing bands.
Ingestion of plastic is another critical issue. Marine animals, including seabirds, sea turtles, fish, and marine mammals, mistake plastic fragments for food. This ingestion can lead to intestinal injuries, blockages, and even death. Small plastic fragments can sit on the water surface, deceiving seabirds and other species into consuming them, resulting in suffocation and starvation. Additionally, microplastics, invisible to the naked eye, can be consumed by a range of marine organisms, transferring toxins to their fatty tissues.
The impact of plastic waste extends beyond individual animals. Plastic pollution can smother and break coral reefs, hindering their healthy growth. According to a study, corals in contact with plastic have an 89% chance of contracting diseases. This disruption affects the broader ecosystem, including the species that depend on healthy coral reefs.
The magnitude of the problem is alarming. It is estimated that up to 13 million metric tons of plastic enter the ocean each year. The Great Pacific Garbage Patch, the largest accumulation of plastic, serves as a stark reminder of the crisis. With plastic production projected to increase, urgent action is needed to address this global epidemic and protect marine life from the deadly consequences of plastic pollution.
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Soil pollution: acid rain changes soil chemistry, making it uninhabitable for some animals
Animals are vulnerable to harm from air pollution, and acid rain is one of the main pollutants that can affect them. Acid rain is any form of precipitation that contains high levels of nitric and sulfuric acids. It is primarily a product of human activities, such as burning fossil fuels, and industrial emissions from coal-burning power plants, factories, and automobiles.
Soil pollution caused by acid rain occurs when it falls to the earth, flows across the surface in runoff water, and enters water systems and the soil. Acid rain changes the chemistry of the soil by increasing its acidity and leaching aluminum from soil clay particles. This process can make the soil uninhabitable for some animals and plants.
The effects of acid rain on soil are most severe in areas where the soil has a low "buffering capacity", such as the mountainous regions of the Northeast United States. In these areas, the soil is thin and cannot adequately neutralize the acidity of the rainwater. As a result, the acid and aluminum accumulate in the soil, streams, or lakes, making the water toxic to aquatic animals.
Additionally, acid rain robs the soil of essential nutrients such as calcium and magnesium, which are vital for the growth and survival of plants and trees. This makes it difficult for trees to absorb water and nutrients, leaving them more vulnerable to infections, cold weather, and insect damage. The trees become weaker and less able to withstand freezing temperatures, which can lead to their death.
The impact of soil pollution by acid rain extends beyond the immediate habitat. In an interconnected ecosystem, where everything is connected, the harm caused to one species of plant or animal can have a ripple effect on other species, including non-aquatic animals such as birds.
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Bioaccumulation: toxins build up in fatty tissues of animals, increasing up the food chain
Animals are extremely vulnerable to harm from pollution, particularly air pollution. One of the key ways in which pollutants affect animals is through bioaccumulation. This is when toxins build up in the fatty tissues of animals, increasing in concentration as they move up the food chain.
Bioaccumulation occurs when animals consume pollutants, which are then stored within their tissues. As these animals are subsequently eaten by predators, the pollutants are passed on and continue to accumulate, increasing in concentration at each trophic level. This means that top predators, such as bears and eagles, are at the greatest risk of harm from bioaccumulation.
For example, mercury is a toxic heavy metal that can be transported long distances through the air. It can accumulate in water bodies, where it is consumed by fish. When these fish are eaten by larger fish, and then by birds or mammals, the mercury concentration increases, potentially reaching harmful levels. This is a significant concern for humans, who may be exposed to high levels of mercury by consuming certain types of fish.
Another example is microplastics, which are ingested by marine organisms such as mussels and oysters when they filter seawater to feed. These microplastics can then be passed up the food chain, accumulating in the fatty tissues of larger organisms. A single plastic particle can adsorb up to one million times more toxic chemicals than the surrounding water, making it a potent source of bioaccumulation.
Bioaccumulation can have severe impacts on animal health, including endocrine disruption, organ injury, increased vulnerability to diseases and stressors, reduced reproductive success, and even death. It is a significant threat to wildlife and can cause population declines and disruptions to ecosystems.
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![Proceedings of the 1979 U.S. Fish and Wildlife Service Pollution Response Workshop, 8-10 May 1979, St. Petersburg, Florida 1979 [Leather Bound]](https://m.media-amazon.com/images/I/61p2VzyfGpL._AC_UY218_.jpg)
Climate change: pollution destroys ecosystems, affecting animals' habitats and food sources
Climate change and pollution are destroying ecosystems, affecting animals' habitats and food sources. Ecosystems are large, naturally occurring communities of plants and animals occurring in a regional or global land area. They provide many benefits to people, known as ecosystem services, such as food, fuel, timber, water, clean air, and medicines. Climate change is threatening these ecosystems in several ways.
Firstly, climate change is causing the loss of local species, increased diseases, and mass mortality of plants and animals, resulting in the first climate-driven extinctions. Human activity has already altered over 70% of all ice-free land, and when land is converted for agriculture, some animal and plant species may lose their habitat and face extinction. For example, as rivers and streams warm, cold-water fish species like trout and salmon are losing their habitat, with projections of 47% habitat loss by 2080. Similarly, the American pika is experiencing decreasing populations and a shifting habitat range due to rising temperatures.
Secondly, climate change is altering the timing of natural cues that plants and animals rely on to trigger certain stages of their life cycles. As a result, species that depend on one another at certain times of the year may no longer be in sync. For instance, young fish may not find enough plankton to eat if the plankton reacts more quickly to temperature changes than the fish.
Thirdly, climate change is increasing the spread of invasive species in some areas. For example, as ocean waters warm, invasive tropical fish species like lionfish are expected to move north along the Atlantic coast, threatening native species.
Finally, air pollution can directly harm wildlife by affecting the quality of their environment and food supply. For example, acid rain can change the chemistry of soils and water, making water bodies too acidic for some animals to survive. Air pollutants can also enter the food chain, accumulating in the tissues of animals and increasing in concentration as they move up the food chain. This bioaccumulation can poison wildlife through organ injury, increased vulnerability to diseases, and lower reproductive success.
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Frequently asked questions
Marine animals such as whales, dolphins, and seabirds often mistake plastic floating on the ocean's surface for food. When ingested, plastic can lead to starvation, suffocation, or internal lacerations that become infected. Plastic pollution can also cause entanglement, leading to drowning, starvation, injury, and increased vulnerability to predators.
Air pollution can kill animals by entering their food chain and damaging the supply and quality of food. Pollutants accumulate in the tissues of animals, causing damage to their organs, weakening their immune systems, and making them more susceptible to diseases. Air pollution also affects the quality of the environment or habitat in which animals live.
Microplastics in the ocean can be ingested by apex predators such as great white sharks and orcas, leading to bioaccumulation and biomagnification of toxic chemicals in their fatty tissues. This can result in endocrine disruption, organ injury, increased vulnerability to diseases, and reduced reproductive success.
One significant source of plastic pollution in the ocean is abandoned fishing gear, also known as "ghost fishing equipment." It is estimated that 640,000 tonnes of the 8 million tonnes of plastic entering the oceans annually are from this source. Single-use plastic is another major contributor to plastic pollution in the marine environment.
The vulnerability of an animal to air pollution depends on its method of gas exchange, whether it breathes through lungs, gills, or skin. Air pollution can affect animals in similar ways to humans, damaging their lungs and cardiovascular systems. Pollutants like heavy metals and toxic substances can accumulate in the environment and harm various species.
