Brian Barton
Light pollution is a growing concern for marine environments around the world. Oceans face a myriad of threats, from microplastics to oil spills, but artificial light is also a significant issue. Research has shown that light pollution from coastal cities reaches the seafloor, affecting marine life and ecosystems. As more people move to cities, light pollution is likely to increase, and the number of marine ecosystems negatively affected will grow. Artificial light can interfere with marine life, from zooplankton to sea turtles, and coral reefs. It can cause shifts in hormonal cycles, interspecies behaviour, and reproduction. With the transition to more energy-efficient LED lighting, the problem is exacerbated as these lights contain more blue and green wavelengths that can penetrate deeper into the water.
| Characteristics | Values |
|---|---|
| Marine life affected by light pollution | Zooplankton, whales, fish, coral, plankton, sea turtles, seabirds, crabs, barnacles, mussels, coastal algae, and invertebrates |
| Impact on marine life | Disruption of natural rhythms, hormonal cycles, interspecies behavior, and reproduction |
| Light sources | Coastal cities, offshore oil rigs, ships, LEDs |
| Light colors | Green light wavelengths leave up to 76% of the seafloor exposed, blue light wavelengths leave up to 70% exposed, red light penetrates less than 1% of the seafloor |
| Solutions | Using red light instead of green or blue light, putting up barriers to shield the coastline from artificial light, enforcing ordinances requiring residents to turn beach-facing lights off at night |
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What You'll Learn
Light pollution from coastal cities
Research has revealed that light pollution from coastal cities can reach the seafloor, impacting up to 75% of the seabed in some areas. This artificial light can have detrimental effects on marine species, from microscopic zooplankton to large whales. For example, light pollution disrupts the natural rhythms of zooplankton, influencing their behaviour and migration patterns even at depths of 200 meters or more.
Coral reefs, which are among the most diverse marine ecosystems, are also affected by light pollution. The excess light lowers the rate of photosynthesis in corals, impacting the organisms that depend on these reefs. Additionally, light pollution interferes with the lunar compass that many species use for navigation, disorienting them and disrupting their migratory patterns.
Sea turtles are another classic example of a species harmed by light pollution. Artificial light hampers their nesting efforts, as female turtles struggle to find dark beaches for egg-laying, and hatchlings become confused by city lights instead of following moonlight to the water.
Addressing light pollution from coastal cities is crucial to mitigating its harmful effects on marine life. This can include measures such as enforcing ordinances that require residents to turn off beach-facing lights at night, transitioning to less harmful types of lighting, and implementing broader-scale efforts to darken skies. By taking action, we can reduce the impact of light pollution on marine ecosystems and protect the diverse species that depend on them.
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Impact on zooplankton
Light pollution is a growing threat to marine environments around the world. It is caused by excessive and misdirected artificial light at night, which floods the ocean and negatively impacts a wide range of sea creatures, including zooplankton.
Zooplankton are microscopic organisms that are foundational to aquatic food chains. They are sensitive to artificial light in their nighttime environments, which encourages them to migrate to deeper waters. Light pollution from ships has been shown to influence the behaviour of zooplankton at depths of 200 meters or more.
One of the main impacts of light pollution on zooplankton is the disruption of their daily vertical migration. Zooplankton typically avoid surface predators during the day and feed on surface phytoplankton at night. However, in the presence of light pollution, the number of zooplankton individuals that migrate and the amplitude of vertical migration decrease, leading to a proliferation of microalgae on the water surface. This can have long-term repercussions on the balance of aquatic ecosystems, including changes in prey-predator relationships, disruptions to food chains, and altered water quality.
In addition, light pollution can alter the intensity, colour, and frequency of light that aquatic organisms are usually exposed to. Zooplankton are photosensitive, and their vision can be affected by the presence of artificial light.
Furthermore, light pollution can increase the sensitivity of zooplankton to extreme warming. The combination of artificial light at night (ALAN) and nighttime warming (NW) can alter the behaviour and physiology of zooplankton, impacting their fitness and nocturnal niche.
Overall, light pollution has significant impacts on zooplankton, disrupting their behaviour, migration patterns, and sensitivity to other environmental factors. Addressing light pollution through measures such as enforcing ordinance laws or using less harmful light bulbs is crucial for mitigating its effects on zooplankton and maintaining the health of marine ecosystems.
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Marine life threatened
Marine life is under threat from light pollution, which is a growing problem in our oceans. Coastal cities, offshore oil rigs, and ships flood the ocean with artificial light, which has a detrimental impact on a wide range of sea creatures. This excessive and misdirected light at night disrupts the natural rhythms of marine life, threatening their habitats.
One of the most crucial ocean creatures, zooplankton, is negatively impacted by artificial light. These microscopic organisms are foundational to aquatic food chains, yet artificial light disrupts their daily migration and encourages them to migrate to deeper waters. Research has shown that light pollution from ships influences zooplankton behaviour at depths of 200 meters or more.
Coral reefs are also affected by light pollution, which interferes with their synchronized spawning events. These events are timed with the lunar cycle to maximize reproductive success, but artificial light from coastal cities can outshine moonlight, disrupting this natural cycle. Light pollution has been shown to lower the rate of photosynthesis in corals, which largely affects the organisms that live in the reefs. Considering coral reefs are the most diverse marine ecosystems on Earth, this is a significant issue.
Sea turtles are another species highly vulnerable to light pollution. Artificial light impacts the success of their nesting sites as female turtles struggle to find dark beaches for laying their eggs. The lights of coastal cities confuse hatchlings, causing them to head inland instead of towards the moonlight on the water, leading to dehydration or starvation.
As human development along coasts continues to grow, marine life will face an ever-increasing flood of artificial light. This threatens to disrupt the natural light intensity and patterns that sea creatures have evolved to adapt to over millions of years. It is crucial to address light pollution to protect marine habitats and the diverse species that depend on them.
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Moonlight and starlight vs artificial light
Moonlight and starlight are the two most common sources of natural light in the night sky. Moonlight is the light that reflects off the moon's surface and onto the Earth. The amount of moonlight visible on Earth depends on factors like the moon's phase, position in the sky, and cloud cover. Moonlight is generally bluish in colour and can create a peaceful atmosphere. On the other hand, starlight is the light emitted by stars and other celestial bodies. The colour of starlight varies based on the temperature of the star, with cooler stars emitting reddish light and hotter stars emitting bluish-white light. Starlight can cast harsh shadows and make distant objects difficult to see.
In contrast to the natural light of moonlight and starlight, artificial light from sources like streetlights and buildings can cause light pollution, negatively impacting both terrestrial and marine environments. Coastal cities, offshore oil rigs, and ships contribute to light pollution in the ocean, affecting a wide range of sea creatures, from zooplankton to whales. Light pollution disrupts natural rhythms and threatens marine habitats. For example, it interferes with the nesting habits of sea turtles, as female turtles struggle to find dark beaches for egg-laying, and hatchlings become disoriented by artificial lights.
Light pollution also affects zooplankton, causing them to migrate to deeper waters. Additionally, it lowers the rate of photosynthesis in corals, impacting the diverse organisms that depend on coral reefs. The widespread adoption of LED lighting exacerbates the problem, as LEDs produce shorter wavelengths that penetrate deeper into the water. Researchers have found that green light wavelengths expose up to 76% of the seafloor to light pollution, while blue light wavelengths expose up to 70%.
To address the issue of light pollution in the ocean, various measures can be implemented. These include enforcing ordinances that require residents to turn off beach-facing lights at night and adopting the use of red light, which does not penetrate as far into the water. It is important to recognize that light pollution is a significant threat to marine ecosystems, and efforts to reduce its impact are crucial for protecting marine life and maintaining the health of our oceans.
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Light pollution and coral reefs
Light pollution is one of the many detrimental factors causing damage to our oceans. As human populations grow and lighting technologies improve, artificial light alters natural cycles of light and darkness. This has a significant impact on marine life, from zooplankton to whales, and is particularly harmful to coral reefs.
Coral reefs are among the most diverse marine ecosystems on Earth, and their life cycles are governed by light. Moonlight and starlight serve as important cues for marine organisms, but their glow can be overwhelmed by artificial light. While the effects of light pollution on some marine life are well understood, the impact on corals is still largely unexplored. However, researchers have found that artificial light can cause abnormal cell proliferation and growth in corals, as well as lower rates of photosynthesis.
A study by Ayalon and Levy focused on two coral species commonly found in the Gulf of Aqaba in the Red Sea, an area undergoing severe light pollution due to urban development. They found that corals exposed to artificial light had higher levels of chemically reactive forms of oxygen that damage DNA, proteins, and cellular structures. The algae populations living symbiotically inside the corals fluctuated abnormally, and their rates of photosynthesis declined. These findings shed light on the emerging threat of light pollution to corals.
Another study by Shlesinger and Loya looked at breeding patterns in Red Sea corals since the 1980s. They found that three out of five species had become unmoored from natural cycles of temperature, daylight, and lunar cycles, reducing the probability of successful fertilization. Light pollution was pointed to as one of the possible causes.
As artificial light reaches the ocean floor and affects marine life, it is important to find ways to reduce its impact. This can include using less harmful light bulbs, putting up barriers to shield coastlines from artificial light, or simply turning off lights at night. By taking these measures, we can help protect coral reefs and other marine ecosystems from the detrimental effects of light pollution.
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Frequently asked questions
Light pollution is the presence of artificial light in spaces that would otherwise be naturally dark.
Light pollution can have a detrimental effect on marine life. It has been shown to cause shifts in hormonal cycles, interspecies behaviour, and reproduction. It can also lower the rate of photosynthesis in corals, which affects the organisms that live in the reefs.
Efforts can be made to minimise light pollution on a mass scale, such as enforcing laws that require residents to turn off beach-facing lights at night. Individuals can also research the least harmful light bulbs to use in their homes.
