Helena Joyce
Human pollution is a major cause of species endangerment. Plastic pollution, in particular, has increased tenfold since 1980 and is now present in almost every part of the human world. Marine animals are especially vulnerable to plastic pollution, with at least 267 species affected, including 86% of marine turtles, 44% of seabirds, and 43% of marine mammals. Sea turtles, for example, often mistake plastic for food, leading to blockages in their digestive systems. Other marine animals, such as seals, sea lions, and whales, are also susceptible to ingesting plastic or becoming entangled in plastic debris, which can cause severe injury or death. In addition to plastic, other forms of pollution, such as oil spills, noise pollution, and chemical runoff, also contribute to the endangerment of marine species, including coral, krill, and various fish species.
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What You'll Learn
- Insects, butterflies, bees, and birds are affected by pesticides and herbicides
- Whales and dolphins are dying from plastic ingestion
- Sea turtles are harmed by plastic and fishing nets
- Penguins are endangered by human pollution and loss of nesting sites
- Manatees are at risk due to algal blooms, boating, and habitat loss
Insects, butterflies, bees, and birds are affected by pesticides and herbicides
Insects, butterflies, bees, and birds are among the most vulnerable species affected by pesticides and herbicides. These toxic chemicals are designed to kill insects and other pests, but they also have devastating effects on non-target organisms, including birds and insects that are vital for pollination and ecological balance.
Insects, such as bees, are highly susceptible to pesticides, especially neonicotinoids (neonics). These synthetic chemicals are designed to mimic nicotine and are applied to seeds, plants, and crops. When bees and other insects feed on these treated plants, the pesticides affect their central nervous system, leading to paralysis and death. The decline of native bees, including Crotch's bumblebee, is a direct result of the widespread use of neonicotinoids. Bees are essential pollinators, and their loss has far-reaching consequences for both wild plants and agricultural crops.
Butterflies, particularly the monarch butterfly, have also been severely impacted by herbicides. The monarch caterpillar relies solely on milkweed as its food source, and the eradication of milkweed by herbicides has led to a drastic decline in the monarch butterfly population.
Birds are affected by pesticides through direct and indirect means. Direct exposure occurs when birds feed on pesticide-treated seeds, plants, or insects, leading to acute poisoning. Additionally, birds of prey can experience secondary poisoning by consuming prey that has been exposed to pesticides. Pesticides can also indirectly impact bird populations by reducing their food sources and nesting sites. For example, insecticides can decrease insect populations that birds rely on for food, and herbicides can destroy the vegetation and habitats that birds need for nesting.
The effects of pesticides on birds can be devastating, as evidenced by research showing that a single kernel of corn coated with a neonicotinoid is enough to kill a sparrow or blue jay. Moreover, pesticides have been linked to cognitive problems and even deaths in bird species.
Overall, the widespread use of pesticides and herbicides poses a significant threat to insects, butterflies, bees, and birds, contributing to their endangerment and disrupting the delicate balance of ecosystems.
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Whales and dolphins are dying from plastic ingestion
Marine animals, such as whales and dolphins, are dying from plastic ingestion. Whales, including the sperm whale, are particularly vulnerable to plastic pollution. Their large mouths and feeding methods, which involve taking huge gulps of seawater while filter feeding, make them more susceptible to ingesting plastic debris. Dolphins are also at risk, with species such as Hector's Dolphins, the smallest and rarest dolphin on the planet, facing additional threats such as entanglement in fishing nets.
The ingestion of plastic can lead to internal injuries and death in whales and dolphins. Flexible plastic, such as plastic bags and packaging, is responsible for the largest proportion of deaths from debris due to gastric obstructions. In one case, a stranded whale was found with 135 items of plastic in its stomach, primarily plastic bags. Another sperm whale was discovered with 79 pounds of plastic in its stomach. These plastics can cause inflammation and toxic buildup in the animal's body, leading to health issues and even death.
The impact of plastic ingestion on whales and dolphins is not always immediately fatal but can cause them to feel full, leading to starvation as they are no longer able to hunt and feed themselves nutritious food. Additionally, plastic may contain bacteria and viruses that further hinder the animal's health. The presence of microplastics, which are smaller and more easily ingested, exacerbates the problem.
The threat of plastic pollution adds to the existing challenges faced by whale and dolphin populations, including whaling, entanglement in fishing nets and lines, climate change impacts, and capture for captivity. With an estimated 8 million tons of plastic entering the ocean each year and approximately 15-51 trillion pieces of plastic currently clogging our oceans, the situation is dire. Some regions have implemented bans on single-use plastics and pledged to produce only completely recyclable materials, but more widespread action is needed to protect these vulnerable species.
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Sea turtles are harmed by plastic and fishing nets
Sea turtles are one of the many animals that are endangered due to pollution. They are affected by plastic pollution and commercial fishing nets.
Sea turtles ingest plastic by mistaking it for their natural food, such as plastic bags that resemble jellyfish, or by accidentally consuming plastic that is present in their natural environment. Plastic can cause blockages in their intestines and pierce the intestinal wall, leading to internal bleeding. In some cases, the presence of plastic in a turtle's stomach can mimic the sensation of being full, leading to starvation as they neglect to seek other food sources. Research by the University of Exeter found that 91% of turtles entangled in discarded fishing gear died.
Commercial fishing gear poses a significant threat to sea turtles, with hundreds of thousands of turtles accidentally caught in gillnets, shrimp trawl nets, and longline hooks each year. Endangered loggerheads, green turtles, and leatherbacks are particularly vulnerable. The use of Turtle Excluder Devices (TEDs) in shrimp trawlers has been proposed as a solution, allowing turtles to escape from nets safely.
To protect sea turtles, individuals can reduce their use of single-use plastics, properly dispose of waste, and support companies and countries that employ TEDs in their fishing practices. These collective efforts can significantly impact the well-being of sea turtles and help ensure their long-term survival.
Overall, sea turtles face severe harm from plastic pollution and commercial fishing nets, and concerted efforts are necessary to mitigate these threats and ensure the preservation of this ancient and iconic species.
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Penguins are endangered by human pollution and loss of nesting sites
Penguins are one of the most threatened groups of seabirds, with human activities posing significant risks to their survival. Pollution, in particular, poses severe dangers to penguin populations, alongside other critical factors such as habitat loss, overfishing, and climate change.
Penguins, including species like the Galápagos penguin, African penguin, and Gentoo penguin, face threats from both marine and terrestrial pollution. Industrial pollutants, plastic debris, and chemical contaminants in the marine environment have detrimental effects on penguin health and survival rates. High concentrations of heavy metals, such as mercury, have been detected in penguin tissues, leading to toxicity and reproductive issues. Oil spills, a form of marine pollution, also present immediate and long-term hazards to penguin health.
Human activities contributing to pollution and habitat loss have severely impacted penguins. Coastal development and tourism have led to the encroachment on critical nesting areas and disturbances in breeding colonies. The presence of humans and unregulated tourism can increase stress levels and even lead to physical harm during nesting seasons. Additionally, climate change-induced alterations in sea ice extent and ocean temperatures disrupt prey availability, further exacerbating the challenges faced by penguins.
The synergistic effects of pollution and other human-induced factors have placed penguins in vulnerable or endangered categories. Conservation efforts are urgently needed to address these threats and safeguard the survival of penguin species. This includes implementing stringent regulations, effective waste management strategies, and protecting breeding habitats through the designation of marine reserves.
Overall, the cumulative impacts of human activities on the world's oceans have had detrimental consequences for penguins. Addressing pollution, habitat loss, and other threats is essential for ensuring the resilience and long-term conservation of these fascinating birds.
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Manatees are at risk due to algal blooms, boating, and habitat loss
Pollution is a major threat to many species, and manatees are no exception. These gentle giants are at risk due to a combination of algal blooms, boating collisions, and habitat loss.
Algal blooms, also known as red tides, occur when there is a rapid increase in the naturally occurring microorganism Karenia brevis. Florida, home to a significant population of manatees, has experienced some of the worst red tide events in history. As manatees feed on seagrass, they ingest the toxins produced by these harmful algal blooms, which can lead to seizures and drowning. The toxins can also be inhaled when manatees surface for air, further exacerbating the problem. In addition to the direct impact on manatees, algal blooms also destroy seagrass beds, depriving manatees of their primary food source.
Boating poses another significant risk to manatees. Manatees inhabit coastal waters, estuaries, and rivers—areas with high boat traffic. As manatees feed on seagrass in shallow waters, they are often close to the surface, making them vulnerable to boat strikes. Collisions with motorboats have been the leading cause of human-related deaths among manatees, and the number of fatalities is rising. In addition to fatal collisions, many manatees bear the scars of non-fatal boat strikes, and the illegal practice of feeding manatees encourages them to associate boats with handouts, putting them in harm's way.
Habitat loss is a critical issue for manatees. This loss can be attributed to various factors, including shoreline development, climate change, and water pollution. The Indian River Lagoon (IRL) in Florida, home to a diverse range of plants and animals, including manatees, has suffered from decades of excess nutrient pollution, leading to harmful algal blooms and seagrass loss. Additionally, winter freezes in shallow waters and the loss of nesting sites further contribute to the decline of manatee habitats.
The combination of these factors—algal blooms, boating accidents, and habitat loss—has had a devastating impact on manatee populations. With less than 3,000 manatees remaining in the world, it is crucial to address these threats through conservation efforts, public awareness, and policy changes to protect these beloved creatures for future generations.
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Frequently asked questions
Marine animals that are endangered due to plastic pollution include sea turtles, whales, seals, Steller sea lions, albatrosses, and fish.
Marine animals mistake plastic waste for food, causing blockages and punctures in their digestive systems. They also become entangled in plastic debris, which can lead to injury and death.
Chemicals used in farming, such as insecticides, herbicides, and artificial fertilizers, can dissolve in rainwater and drain into bodies of water, polluting the water and killing the wildlife. These chemicals can also enter the food chain, accumulating in the bodies of animals and leading to poisoning.
