Table of Contents
Greener Journal of Ecology and Ecosolution
Vol. 6(1), pp. `8-14, 2025
ISSN: 2384-6356
Copyright ©2025, the copyright of this article is retained by the author(s)
https://gjournals.org/GJEE
DOI Link: https://doi.org/10.15580/gjee.2025.1.081325119
Department of Biology/Environmental Management and toxicology, Faculty of Science, Federal University Otuoke.
This study examines the impact of artificial night light on nocturnal animals, focusing on the ecological consequences of light pollution. With the growing prevalence of artificial lighting in both urban and rural areas, natural light patterns are disrupted, which can significantly impact the behaviour, physiology, and survival of nocturnal species. These animals, which depend on darkness for activities such as foraging, mating, and avoiding predators, are especially susceptible to the disturbances caused by artificial light. The study explores how light pollution interferes with navigation, disrupts circadian rhythms, and alters predator-prey relationships. It also delves into the broader ecological effects, including shifts in species distribution, reproductive success, and ecosystem health. Moreover, the study reviews recent research on the physiological consequences of artificial light exposure, such as changes in hormone levels and increased stress. The study highlights the need to mitigate light pollution to safeguard biodiversity, particularly for nocturnal species, and advocates for policy reforms and sustainable lighting practices to minimize the ecological impact of artificial lighting.
Article No.: 081525121
Type: Review
Full Text: PDF, PHP, EPUB, MP3
DOI: 10.15580/gjee.2025.1.081325119
Accepted: 15/08/2025
Published: 25/08/2025
Onu Benefit
E-mail: Benefitonu28@gmail.com; onub@fuotuoke.edu.ng
Keywords: Impact of Artificial Night Lights, ecological impact, Behavioural Impact and Nocturnal Animals
Nocturnal animals are species that are primarily active during the night and exhibit specialized adaptations for survival in low-light conditions. These adaptations include enhanced senses such as acute hearing, heightened smell, and specialized vision that allows them to navigate and hunt in darkness (Fleming et al., 2014). Nocturnality is found across diverse taxa, including mammals, birds, reptiles, and insects, enabling these animals to exploit unique ecological niches (Kronfeld-Schor & Dayan, 2003). The success of nocturnal animals is largely attributed to their physical and behavioural adaptations. For example, many nocturnal mammals have a high density of rod cells in their retinas, providing superior night vision (Yamazaki et al., 2000). Echolocation, used by bats, and the enhanced olfactory abilities of species like owls and foxes further facilitate efficient hunting and navigation in the dark (Schnitzler & Kalko, 2001). Additionally, nocturnal behaviors minimize competition for resources and reduce exposure to daytime predators (Sharma et al., 2016). Nocturnal animals play a vital role in maintaining ecosystem balance. Predators such as owls and bats help regulate populations of insects and small mammals, thereby contributing to pest control and reducing crop damage (Kunz et al., 2011). Nocturnal pollinators like moths are critical for the reproduction of certain night-blooming plants, enhancing biodiversity and supporting food chains (Krenn et al., 2005). Furthermore, scavengers such as hyenas help in nutrient cycling by consuming carcasses left by other predators, preventing the spread of disease (Berger et al., 2008). Human activities such as urbanization, artificial lighting, and habitat destruction pose significant threats to nocturnal animals. Light pollution disrupts their natural behaviors, including feeding, mating, and migration patterns (Rich & Longcore, 2006). Conservation efforts aimed at mitigating these impacts, such as reducing light pollution and protecting natural habitats, are essential for preserving nocturnal biodiversity and maintaining ecological stability.
Artificial night lighting refers to human-made illumination that provides visibility during nighttime. This type of lighting has become a fundamental feature of both urban and rural areas, playing a vital role in supporting human activities while simultaneously disrupting natural ecosystems. The prevalence of artificial lighting has been closely linked to urban development and technological progress, which have facilitated its widespread use (Longcore & Rich, 2004). Artificial night lighting includes various types of human-generated light that interfere with the natural darkness of the night. Examples include streetlights, security lights, vehicle headlights, illuminated signage, and indoor lighting that leaks into the environment. These lights serve numerous purposes, such as enhancing safety, enabling nighttime economic activities, improving aesthetics, and aiding navigation (Falchi et al., 2016). However, continuous exposure to artificial lighting has been shown to disrupt biological rhythms and negatively impact ecological systems, making it an area of growing concern in environmental science (Gaston et al., 2015).
Street and Outdoor Lighting: Streetlights represent one of the most prevalent sources of artificial night lighting, designed to illuminate roads, sidewalks, and other public spaces for transportation and safety. Historically, high-intensity discharge lamps like sodium-vapor and mercury-vapor lights have been common, but energy-efficient bulbs are now becoming the standard due to their longer lifespan and reduced energy use (Kyba et al., 2017). Outdoor lighting for security purposes also adds significantly to light pollution.
Commercial Lighting and Advertising: Retail outlets, shopping malls, and recreational venues use artificial lighting to attract visitors and facilitate nighttime activities. Brightly lit advertisements, neon signs, and decorative lighting are common in urban areas and often operate continuously throughout the night. While these lights are effective for visibility and marketing, they also contribute to over-illumination and energy waste (Perkin et al., 2011).
Transportation Lighting: Lighting used for transportation includes vehicle headlights, runway lights at airports, and marine navigation lights. These are essential for safety and navigation but can significantly increase light pollution in highly trafficked and industrialized regions. High-beam headlights and continuously illuminated highways are particularly notable contributors (Jarić et al., 2020).
Residential Lighting: Homes contribute to artificial night lighting through porch lights, garden lighting, and interior illumination that escapes to the outdoors. This type of lighting, especially in densely populated areas, contributes to skyglow, where the night sky becomes brightly illuminated and obscures natural celestial visibility (Falchi et al., 2016).
Industrial and Infrastructure Lighting: Factories, warehouses, and large infrastructure projects like power plants and oil refineries rely on constant illumination for operations. These sources of artificial lighting are often intense and operate continuously, contributing significantly to local and regional light pollution (Kyba et al., 2017).
Recreational and Sports Lighting: Artificial lighting used in sports arenas, stadiums, and recreational facilities is another major contributor. These lights are typically very powerful and often spill into adjacent areas, affecting nearby habitats and increasing urban light pollution (Gaston et al., 2015).
Emergency and Temporary Lighting: Temporary lighting used during construction projects, disaster responses, or events adds to artificial night lighting. Although these lights are not permanent, their impact on the surrounding environment, particularly in sensitive areas, can be significant (Jarić et al., 2020). Artificial night lighting originates from a wide range of sources, all of which have become integral to modern life. However, its effects on ecosystems, human health, and energy consumption necessitate careful management. As urbanization continues to expand, it is essential to understand and mitigate the negative consequences of artificial lighting on the environment and society.
Artificial light at night has emerged as a widespread environmental challenge, deeply impacting the natural behaviors and ecological balance of nocturnal species. With urbanization on the rise, the prevalence of light pollution has disrupted the biological processes and ecological interactions vital for the survival of species that rely on darkness. This detailed discussion focuses on the major ecological consequences of artificial light at night, particularly how it influences the behavior, physiology, and ecological roles of nocturnal species (Hölker et al., 2010).
Disruptions to Natural Behaviour
• Altered Foraging and Feeding: Artificial lighting significantly interferes with the foraging habits of nocturnal species by changing their activity patterns and spatial distribution. Predators like bats and owls, which depend on darkness for hunting, face challenges in detecting prey in illuminated areas. Prey species, such as insects, often congregate around artificial lights, leading to localized declines and disruptions in predator-prey dynamics (Gaston et al., 2015). This imbalance threatens ecosystems by skewing natural food chain relationships (Holker et al., 2010).
• Changes in Predator-Prey Interactions: Artificial light at night reshapes predator-prey dynamics by favoring certain species over others. Prey, such as rodents, become more susceptible to predators in lit environments, while nocturnal predators often struggle to adapt their hunting techniques to these altered conditions (Pawson & Bader, 2014).
• Impacts on Migration: The migratory behavior of certain nocturnal species, particularly birds, is profoundly affected by light pollution. Artificial lights disorient migrating birds, causing them to veer off course or collide with illuminated structures, resulting in higher mortality rates and interrupted migration cycles (Dominoni et al., 2016).
Physiological Disruptions
• Disturbed Circadian Rhythms: Circadian rhythms, essential for regulating sleep-wake cycles, feeding, and reproduction in nocturnal species, are disrupted by exposure to artificial light. Artificial light at night reduces melatonin production, a key hormone that regulates these rhythms, leading to stress, weakened immunity, and reduced reproductive success (Gaston et al., 2015).
• Effects on Reproductive Processes: Artificial lighting can adversely impact reproductive behaviors in nocturnal animals. Amphibians, such as frogs, require darkness for mating calls. Artificial light at night reduces the frequency and duration of these calls, negatively affecting reproduction (Longcore & Rich, 2004). Similarly, sea turtles experience altered nesting behavior and hatchling orientation due to disrupted natural light cues (Hölker et al., 2010).
Broader Ecosystem Impacts
• Reduced Pollination Services: Nocturnal pollinators like bats and moths are vital for maintaining biodiversity through pollination. Artificial light at night diminishes their activity, reducing pollination rates and potentially leading to declines in plant populations dependent on these species for reproduction (Knop et al., 2017).
• Shifts in Food Webs: The effects of light pollution ripple through food webs, disrupting predator-prey dynamics and altering species composition. Reduced prey availability affects predator survival and reproduction, while species that adapt to artificial light may outcompete others, impacting ecosystem balance (Gaston et al., 2015).
• Fragmentation of Habitats: Illuminated areas often act as barriers for nocturnal species, fragmenting their habitats and limiting movement and dispersal. This isolation can lead to reduced genetic diversity, population declines, and a decrease in ecosystem resilience (Falchi et al., 2016).
Behavioural Changes
Foraging, Mating, and Migration The behaviour of nocturnal animals is intricately connected to darkness, which serves as a crucial cue for activities like foraging, mating, and migration. Artificial Light at Night disrupts these behaviours, leading to significant ecological and evolutionary implications.
Foraging Behaviour: Foraging, an essential activity for nocturnal species, is strongly influenced by light availability. Artificial light at night modifies foraging behavior in several significant ways:
• Effects on Predators: Nocturnal predators, including bats and owls, depend on low-light environments to locate and capture prey effectively. Artificial light at night disrupts these conditions by illuminating hunting areas, making prey more challenging to locate and reducing hunting success. Research reveals that bats avoid areas with bright lights, resulting in diminished feeding opportunities and altered activity patterns (Baker & Richardson, 2006).
• Effects on Prey Species: Prey species, especially insects, exhibit a light-attraction behaviour known as phototaxis. Artificial lights draw insects to illuminated areas, causing localized population declines. This diminishes food availability for predators and disrupts insect communities, which play critical roles in pollination and nutrient cycling (Holker et al., 2010).
• Altered Predator-Prey Dynamics: By modifying visibility and behaviour, artificial light at night disrupts predator-prey relationships. Predators that adapt to illuminated conditions, such as certain bird species, may gain an advantage, whereas nocturnal predators and their prey face disadvantages (Pawson & Bader, 2014).
Mating Behaviour
Reproductive success in nocturnal species is closely tied to environmental conditions, with darkness often crucial for courtship and mating. Artificial light at night disrupts these behaviours, reducing reproductive success across many species.
• Amphibians and Mating Calls: Amphibians, like frogs and toads, rely on nighttime darkness for effective communication during the breeding season. Male frogs produce mating calls at night to attract females. Artificial light at night shortens the frequency and duration of these calls, reducing their ability to attract mates and significantly lowering reproductive success (Baker & Richardson, 2006).
• Disrupted Mating Signals in Insects: Insects such as fireflies and moths use light-based signals for courtship. Fireflies, for example, rely on bioluminescence to attract mates. Exposure to artificial light at night interferes with these signals, leading to lower mating success and population declines (Owens & Lewis, 2018).
• Nesting Behaviour in Sea Turtles: Sea turtles are particularly affected by light pollution. Females avoid nesting on brightly lit beaches, and hatchlings often become disoriented by artificial lights, struggling to find the ocean. This drastically reduces hatchling survival rates (Witherington & Martin, 2000).
Migration Behaviour
Migration, an energy-intensive and complex process, relies heavily on natural light cues for navigation. Artificial light at night interferes with these cues, leading to disorientation, delayed migrations, and increased mortality.
• Disorientation in Migratory Birds: Many bird species use celestial cues, such as stars, to navigate during migrations. Artificial lighting disorients them, causing deviations from migration routes. Birds attracted to brightly lit urban areas face exhaustion, collisions with buildings, and higher predation risks (Van Doren et al., 2017).
• Effects on Migratory Insects: Artificial light at night disrupts the navigation of migratory insects like moths, causing increased energy expenditure and reduced reproductive success. These disruptions have significant ecological consequences, as insects are vital for pollination and as prey for other species (Altermatt & Ebert, 2016).
• Impacts on Aquatic Migrants: Aquatic species such as fish and amphibians rely on lunar cycles to guide migration and spawning. Artificial lights near water bodies interfere with these natural cycles, affecting reproductive success and altering migration timing (Perkin et al., 2011).
Physiological Effects
Circadian Rhythm and Stress Responses Artificial light at night has a profound effect on the physiology of both nocturnal and diurnal species. Two key areas where artificial light at night causes significant disruption are circadian rhythms and stress responses (Longcore & Rich, 2004; Navara & Nelson, 2007). These disruptions can have a wide range of consequences for behavior, reproduction, immune function, and overall survival (Dominoni et al., 2013; Gaston et al., 2015).
Disruption of Circadian Rhythms
Circadian rhythms, which govern various physiological processes like sleep-wake cycles, hormone production, and metabolism, are synchronized with environmental cues such as light. Artificial light at night interferes with this natural synchronization, resulting in physiological dysfunction.
• Suppression of Melatonin: Melatonin, a hormone produced during periods of darkness, is critical for regulating circadian rhythms. Artificial light at night reduces melatonin levels, which disrupts sleep quality, immune function, and reproductive health. For instance, research on rodents has shown that suppression of melatonin due to artificial light at night leads to enhanced tumor growth and weakened immune responses, highlighting its importance in maintaining physiological health (Blask et al., 2011). Altered Sleep Patterns By extending light exposure, artificial light at night causes disruptions in sleep-wake cycles, leading to fragmented sleep and shorter total sleep durations. This effect is particularly pronounced in diurnal species. For example, birds exposed to urban lighting show delayed onset of rest during the night and earlier wake times, which can negatively impact their energy conservation and recovery, reducing overall fitness (Dominoni et al., 2013).
• Effects on Seasonal Rhythms: Circadian rhythms are closely tied to seasonal biological events like reproduction and migration. Artificial light at night disrupts seasonal cues, causing a mismatch between environmental conditions and physiological processes. For instance, altered light exposure can trigger premature breeding in birds, resulting in a misalignment between the timing of offspring birth and the availability of food resources (Kempenaers et al., 2010).
Stress Responses
Chronic exposure to artificial light at night can trigger stress responses, disrupting physiological homeostasis. These stress reactions are controlled by the hypothalamic-pituitary-adrenal (HPA) axis, which regulates the secretion of cortisol or corticosterone in vertebrates.
• Elevated Corticosterone Levels: Artificial light at night exposure has been linked to elevated corticosterone levels in various species, indicating chronic stress. High corticosterone levels affect energy metabolism, immune responses, and reproductive success. For example, amphibians exposed to artificial light exhibit increased stress hormone levels, which result in reduced mating success and higher mortality rates (Longcore & Rich, 2004).
• Oxidative Stress: Artificial light at night -induced stress increases the production of reactive oxygen species (ROS), which leads to oxidative damage and lowers antioxidant defenses. This imbalance contributes to cellular damage, aging, and increased susceptibility to diseases. A study on fish species found that exposure to artificial light was associated with higher oxidative stress markers and impaired physiological performance (Brüning et al., 2015).
• Behavioural and Immune Effects: Artificial light at night -induced stress responses also manifest in changes to behavior, such as increased aggression or avoidance behaviours. Chronic stress can suppress immune function, making organisms more susceptible to infections and diseases. For example, nocturnal mammals exposed to light pollution showed reduced lymphocyte activity, which suggests compromised immunity (Navara & Nelson, 2007)
In conclusion, the influence of artificial night lighting on nocturnal animals is both profound and multifaceted, encompassing various ecological, behavioral, and biological effects. Nocturnal animals have evolved to depend on natural cycles of light and dark for their survival (Rich & Longcore, 2006). Artificial lights, however, disrupt these natural patterns, interfering with critical aspects of their behavior, such as navigation, hunting, reproduction, and communication (Gaston et al., 2015). Many species rely on darkness to find food, avoid predators, or engage in mating rituals. The bright glow of artificial lights confuses their sensory cues, leading to disorientation, altered feeding schedules, and, in some cases, changes in migration patterns (Dominoni et al., 2016; Bennie et al., 2015). Prolonged exposure to artificial lighting can have cascading effects on ecosystems. As nocturnal animals’ behavior is altered, the balance of predator-prey dynamics and species interactions can be disrupted (Hölker et al., 2010). For example, predators that rely on lowlight conditions to ambush prey may find it harder to catch their food, while prey species may adapt to these changes by altering their habitat preferences, potentially resulting in shifts in species distribution (Spoelstra et al., 2015). In extreme cases, these disruptions can lead to population declines, especially for species already vulnerable to habitat loss and environmental change (Pauley, 2004). Furthermore, nocturnal animals are not merely passive victims of light pollution; their entire survival strategies are intricately tied to the natural light-dark cycle. This connection underscores the importance of maintaining natural light conditions for the well-being of these species. The rapid expansion of artificial lighting in urban areas and along roadways exacerbates this issue, making it a widespread environmental concern that demands immediate attention (Falchi et al., 2016). Addressing the impact of artificial night lights requires concerted efforts at multiple levels. There is a critical need for greater awareness about the ecological consequences of light pollution, coupled with ongoing research to better understand its full scope and long-term effects (Rich & Longcore, 2006). Policy intervention will be essential in mitigating these impacts, including enforcing lighting regulations, implementing eco-friendly lighting solutions, and promoting alternatives to traditional lighting systems (Gaston et al., 2015). Thoughtful urban planning that incorporates measures like shielding lights to reduce skyglow and the promotion of energy-efficient, low-impact lighting can play an essential role in reducing the negative effects of artificial lighting. By restoring more natural lighting conditions, we can help preserve the delicate balance of nocturnal ecosystems and ensure the continued survival of the vital species that depend on darkness for their existence.
To reduce the physiological impacts of artificial light at night, targeted conservation strategies should be employed:
• Smart Lighting Design: Implement motion-sensitive, low-intensity lighting with minimal blue-light emissions to help reduce melatonin suppression and stress (Pauley, 2004; Gaston et al., 2012).
• Protection of Dark Habitats: Establish and preserve dark-sky zones to maintain natural circadian rhythms in wildlife (Falchi et al., 2016; Hölker et al., 2010).
• Public Education: Raise awareness about the ecological importance of minimizing unnecessary nighttime lighting to protect species’ health and well-being (Rich & Longcore, 2006).
To mitigate the effects of artificial light at night on nocturnal behaviours, targeted conservation efforts are essential:
• Wildlife-Friendly Lighting: Use low-intensity, shielded lights to minimize skyglow and blue-light emissions (Longcore & Rich, 2004; Gaston et al., 2012).
• Dark-Sky Reserves: Establish and protect areas with minimal light pollution to preserve natural behaviors (Falchi et al., 2016).
• Policy and Regulation: Implement guidelines that restrict unnecessary outdoor lighting near sensitive habitats (Hölker et al., 2010). Raising public awareness and promoting sustainable lighting practices are also critical steps to reduce the harmful impacts of light pollution on nocturnal species (Rich & Longcore, 2006).
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