Meghan Hodges
Marine noise pollution is a form of environmental pollution caused by human activities such as commercial shipping, oil exploration, seismic surveys, offshore wind turbine installation, and military sonar, which generate unnatural and excessive sound underwater. Sound travels almost five times faster in water than in air, and noise from these activities can travel long distances, increasing noise levels in many coastal and offshore habitats. This noise interferes with the key life functions of marine mammals, such as breeding, foraging, maintaining social structure, and avoiding predators, and can lead to temporary or permanent hearing loss, behavioural and physiological changes, masking of natural sounds, injury, and even death.
| Characteristics | Values |
|---|---|
| Definition | Ocean noise pollution is a form of environmental pollution caused by human activities that generate unnatural and excessive sound underwater. |
| Sources | Commercial shipping, oil exploration, seismic surveys, offshore wind turbine installation, military sonar, propeller cavitation, construction, pile driving, seismic air guns, explosions, recreational boating, and energy exploration. |
| Impact on marine life | Marine animals rely on sound for survival, communication, finding prey, locating mates and offspring, avoiding predators, navigation, and locating habitats. Noise pollution can cause hearing loss, behavioural and physiological changes, injury, and even death. It can also lead to changes in individual and social behaviour, altered metabolisms, hampered population recruitment, and decreased communication range. |
| Solutions | Policies to reduce propeller noise from ships, quieter technologies, slower ship speeds, ending seismic surveys for oil and gas, transitioning to low-noise renewable energy sources, and regulations to protect species and habitats from noise pollution. |
| Regulations | Local governments and individual ports have established their own regulations. The European Union has set mandatory thresholds for underwater noise, and international institutions like the United Nations Convention on the Law of the Sea (UNCLOS) aim to prevent and reduce marine pollution from vessels. |
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What You'll Learn
- Human activities such as shipping, boating, and energy exploration are sources of marine noise pollution
- Sound is critical for marine species' survival, communication, and understanding of their environment
- Marine noise pollution can cause hearing loss, behavioural changes, injury, and even death in marine animals
- There is a lack of international legal regulations on marine noise pollution, despite its harmful effects
- Conservation efforts aim to reduce marine noise pollution and protect diverse marine regions
Human activities such as shipping, boating, and energy exploration are sources of marine noise pollution
Marine noise pollution is a form of environmental pollution caused by human activities, such as shipping, boating, and energy exploration, that generate unnatural and excessive sound underwater. These activities have increased over the last century, with more than 250,000 vessels travelling across the global ocean at any one time. Sound is the most efficient means of communication underwater, and marine animals have evolved to rely on sound for critical activities like breeding, foraging, maintaining social structure, and avoiding predators.
Shipping is a major contributor to marine noise pollution. Cargo vessels produce very low-frequency sounds that can travel hundreds of kilometres underwater. The constant drone of global shipping masks the natural soundtrack of the sea, interfering with biological and ecological processes. The noise from cargo ships can reach 190 decibels, which is louder than a plane taking off. Shipping noise has been shown to drive whales away from critical feeding grounds, threatening their survival.
Boating, including recreational boating and jet ski traffic, also contributes to marine noise pollution. Jet skis, in particular, produce low-frequency sonar sounds used in submarine detection that can be detrimental to marine life.
Energy exploration, such as oil and gas exploration, offshore wind turbine installation, and seismic surveys, are additional sources of marine noise pollution. Pile driving, drilling, and machinery operations produce loud, point sources that propagate far into the water. Seismic surveys can use airguns that generate extremely powerful sound waves, exceeding 230 decibels, which can cause physical harm to marine mammals, including internal bleeding and, in extreme cases, death.
The impact of marine noise pollution on marine life is significant. It can disrupt the natural behaviours of marine mammals, interfere with their ability to communicate, and alter their migration routes. It can also drive them away from important feeding and breeding grounds, affecting their reproduction cycles and mortality rates. Marine noise pollution has been linked to mass whale strandings and a decline in cetacean populations.
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Sound is critical for marine species' survival, communication, and understanding of their environment
Marine animals have evolved over millions of years to use sound as a primary means of communication and environmental understanding. Sound is a highly efficient medium of communication underwater, and many marine species rely on it to gather information about their surroundings. Marine mammals, for instance, use complex sounds to communicate with each other, navigate water, locate prey and mates, and avoid predators. Fish and invertebrates also use sound for these basic survival functions.
Noise pollution in the marine environment has increased significantly over the past few decades, threatening the natural soundscape. Human activities such as shipping, energy exploration, seismic surveys, construction, and the use of sonar devices have contributed to this issue. These noises can travel long distances underwater, increasing noise levels in coastal and offshore habitats. The impact of this pollution is being felt across various marine ecosystems, and it is evident that it is having negative effects on many species.
The sounds created by human activity in the ocean can mask the natural sounds produced by marine wildlife. This interference with acoustic signals can lead to changes in individual and social behaviour, altered metabolisms, and hampered population recruitment, ultimately affecting the health and functions of marine ecosystems. For example, increased ship noise has caused bottlenose dolphins to simplify their vocal calls, potentially reducing the effectiveness of their communication. Noise pollution can also cause hearing loss in marine animals, which can prove fatal when sound is one of their primary tools for survival.
Additionally, excessive noise can be particularly disruptive to species that rely on echolocation, such as dolphins and toothed whales. It can cause disorientation and hinder their ability to hunt successfully. In some cases, the panic induced by loud noises can lead animals to ascend too quickly, resulting in decompression sickness and skin damage. The indirect effects of noise pollution on one species can also have knock-on effects on others. For instance, if a whale strands on a beach due to sudden loud noise, the seafloor-dwelling animals that rely on the whale's body as a food source are negatively impacted.
To address this issue, there have been calls for policies to reduce propeller noise from ships and mitigate the sounds of sonar equipment, seismic air guns, pile driving, and construction. Developing quieter technologies and reducing ship speeds can also help improve the ocean soundscape and enable the recovery of some marine life. International bodies are beginning to recognise the importance of addressing underwater noise pollution, with organisations like OceanCare advocating for mandatory regulations and quieter seas.
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Marine noise pollution can cause hearing loss, behavioural changes, injury, and even death in marine animals
Marine noise pollution has turned the oceans into a loud and chaotic environment, which is extremely damaging to marine wildlife. Marine animals, particularly marine mammals such as whales, dolphins, and porpoises, are highly dependent on sound for their survival. They rely on sound to communicate, locate mates and prey, avoid predators, navigate, and defend their territories.
Noise pollution interferes with these key life functions by causing hearing loss, behavioural changes, injury, and even death in marine animals. Very loud noises from sources such as naval sonar devices, ships, seismic surveys, explosions, and construction can lead to immediate hearing damage, including temporary or permanent hearing loss in marine animals. Sound is one of the main tools marine mammals use for survival, so hearing loss can prove fatal.
Behavioural changes in marine animals due to noise pollution have been observed in various studies. For example, increased ship noise has caused bottlenose dolphins to simplify their vocal calls, potentially reducing the effectiveness of their communication. In another study, blue whales were observed to stop feeding, increase their swimming speed, and move away from the sound source when exposed to sonar, even at much lower sound levels than those produced by military sonar. These behavioural changes can have significant impacts on the individual fitness, foraging ecology, and population health of marine animals.
Noise pollution can also cause injury and death in marine animals. If a marine animal is too close to a loud noise source, it may panic and ascend too quickly to escape the noise, leading to decompression sickness and tissue damage from gas bubble lesions. Additionally, loud noises can cause marine animals to strand, with mass strandings of beaked whales and other species coinciding with the use of naval sonar. These strandings may only represent a small percentage of the actual impact, as severely injured animals rarely make it to shore.
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There is a lack of international legal regulations on marine noise pollution, despite its harmful effects
Marine noise pollution refers to the increasing levels of noise in the ocean caused by human activities such as shipping, boating, and energy exploration. Sound is the primary means of communication for many marine species, and this rising noise level negatively impacts their ability to communicate with potential mates, group members, offspring, or feeding partners. It can also lead to behavioural changes, physiological changes, hearing loss, injury, and even death.
Despite the harmful effects of marine noise pollution, there is a lack of international legal regulations specifically addressing this issue. While some organizations like the International Maritime Organization (IMO) have issued guidelines and action plans to reduce underwater radiated noise from shipping, these are not legally binding. The IMO's guidelines focus on reducing noise from commercial shipping, recognizing its adverse effects on marine life, including marine mammals, fish, and invertebrates.
In recent years, the European Union (EU) has taken a significant step by setting mandatory limits for underwater noise pollution, becoming the first region to do so. The EU's measures were developed under the Marine Strategy Framework Directive (MSFD), aiming to protect marine life and biodiversity in European oceans. This move by the EU is a positive step towards addressing the growing threat of underwater noise pollution and its impact on the health and lives of marine species.
However, on a global scale, there is still a lack of comprehensive legal regulations. While the IMO's guidelines are a step in the right direction, they are not enforceable, and there are no international treaties or conventions specifically targeting marine noise pollution. This gap in international law needs to be addressed, given the well-documented harmful effects of this type of pollution on marine ecosystems.
To effectively tackle marine noise pollution, a coordinated international response is required, involving collaboration between governments, industries, and environmental organizations. The development and implementation of policies, regulations, and technological innovations to reduce propeller noise from ships, sonar equipment, and other sources of underwater noise are essential. Additionally, public education and advocacy play a crucial role in raising awareness about this often-overlooked form of pollution and its impact on marine life.
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Conservation efforts aim to reduce marine noise pollution and protect diverse marine regions
Marine noise pollution is a significant threat to marine ecosystems and wildlife. Sound is the primary means of communication and environmental understanding for many marine species, playing a critical role in activities like breeding, foraging, and avoiding predators. However, human activities such as shipping, boating, and energy exploration have significantly increased noise levels in marine environments, with detrimental effects on marine life.
Conservation efforts are vital to reducing marine noise pollution and protecting diverse marine regions. Organizations like OceanCare have advocated for quieter seas since 2002, engaging with governments and international bodies to address noise pollution. One successful outcome was the designation of the waters between the Balearic Islands and the Spanish mainland as a marine-protected area, preventing seismic surveys and oil and gas exploration.
To reduce anthropogenic noise, policies targeting propeller noise from ships, sonar equipment, seismic air guns, pile driving, and construction are necessary. The International Maritime Organization (IMO) has established guidelines for quieter ship designs, including modifications to hulls and propellers, which can significantly reduce vessel noise levels. Stricter noise regulations in shipping lanes and incentives for noise-reducing technologies can drive industry-wide change.
NOAA Fisheries, through its Ocean Noise Strategy, aims to address the impacts of noise on marine species and ecosystems. Their goals include improving understanding of noise impacts, integrating actions to minimize acute and chronic effects, developing decision-support tools, and educating the public about noise impacts.
Scientific research and education are essential in mitigating marine noise pollution. The Oceans Research Institute (ORI) offers marine biology training that equips students to address environmental challenges caused by human activities, including noise pollution. By studying bioacoustics and environmental factors, students can better understand marine ecosystems and the impact of anthropogenic noise disturbances.
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Frequently asked questions
Marine noise pollution is a type of environmental pollution caused by human activities that generate unnatural and excessive sound underwater. These activities include commercial shipping, oil exploration, seismic surveys, offshore wind turbine installation, and military sonar.
Marine noise pollution can interfere with the natural behaviors of marine animals, particularly those that rely on sound for communication, echolocation, and survival. It can cause temporary or permanent hearing loss, behavioural and physiological changes, masking of natural sounds, injury, and even death.
To reduce marine noise pollution, policies and regulations need to be implemented to mitigate propeller noise from ships, sonar equipment, seismic air guns, pile driving, and construction. Quieter technologies should also be developed, and ship speeds should be reduced.
