{"id":292044,"date":"2021-07-06T19:04:27","date_gmt":"2021-07-06T16:04:27","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/light-pollution-has-complex-effects-on-animal-vision\/"},"modified":"2021-07-06T19:04:27","modified_gmt":"2021-07-06T16:04:27","slug":"light-pollution-has-complex-effects-on-animal-vision","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/light-pollution-has-complex-effects-on-animal-vision\/","title":{"rendered":"#Light pollution has complex effects on animal vision"},"content":{"rendered":"

“#Light pollution has complex effects on animal vision<\/strong>”<\/p>\n

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\n A photo of a foxglove calibrated to different visual systems and artificial light types. From left: human vision in sunlight, hawkmoth moonlight, hawkmoth white LED, hawkmoth PC amber LED. Hawkmoth images are shown in ‘false color’ with their green, blue and ultraviolet sensitivities shown in the place of human red, green and blue respectively. Credit: Jolyon Troscianko
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Changes in the color and intensity of light pollution over the past few decades result in complex and unpredictable effects on animal vision, new research shows.<\/p>\n


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Insect attraction to light is a well-known phenomenon, but artificial lighting can also have more subtle consequences for species that rely on night-time vision for their behavior.<\/p>\n

To explore these effects, University of Exeter researchers examined the impact of more than 20 kinds of lighting on the vision of moths, and birds that eat them.<\/p>\n

The study found that elephant hawkmoth vision was enhanced by some types of lighting and disrupted by others, while the vision of birds that hunt moths was improved by almost any lighting.<\/p>\n

Night-time lighting is increasing rapidly worldwide, and has changed dramatically in the last 20 years, as amber (low-pressure sodium) streetlights are replaced with a diverse range of modern lights such as LEDs.<\/p>\n

“Modern broad-spectrum lighting allows humans to see color more easily at night,” said Dr. Jolyon Troscianko, of the Centre for Ecology and Conservation on Exeter’s Penryn Campus in Cornwall.<\/p>\n

“However, it is difficult to know how these modern light sources affect the vision of other animals.<\/p>\n

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\n Elephant hawkmoth. Credit: Emmanuelle Briolat
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“Hawkmoth eyes are sensitive to blue, green and ultraviolet, and they use this color vision to help find flowers just like bees, but at incredibly low light levels\u2014even under starlight.<\/p>\n

“Moths are also vitally important pollinators\u2014accounting for a similar proportion of pollination as bees\u2014so we urgently need to investigate how lighting affects them.<\/p>\n

“We used animal vision modeling to calculate the ability of moths to see flower colors, and of birds to see camouflaged moths under a wide range of natural and artificial lighting.<\/p>\n

“Artificial lights designed for human vision lack the blue and ultraviolet ranges that are key to moth color vision, and under many conditions will block the moth’s ability to see any colors at all.<\/p>\n

“This could make it more difficult for them to find and pollinate wildflowers, and for them to find suitable spots to camouflage them from predators.<\/p>\n

“Conversely, bird vision is much more robust, meaning artificial light will help them to find camouflaged moth prey, and will allow them to hunt later into the evening and earlier in the morning.”<\/p>\n

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\n Privet hawkmoth on foxglove. Credit: Jolyon Troscianko
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The study finds that phosphor converted amber LED lighting\u2014often suggested to be less harmful to nocturnal insects\u2014has unpredictable consequences for insect vision depending on distance from the light source and the color of the objects viewed.<\/p>\n

White lights (with a greater blue component), allow for more natural color vision in moths, but these light sources are known to be harmful for other species.<\/p>\n

Moth numbers are declining across Europe, but this is particularly true of nocturnal species, with growing evidence for a link with light pollution.<\/p>\n

The researchers call for a “nuanced app<\/a>roach” to lighting, beyond general<\/a> efforts to limit the amount and intensity of light where possible.<\/p>\n\n

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Night-time lighting changes how species interact\n <\/p><\/div>\n

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\n More information:<\/strong>
\n Emmanuelle S. Briolat et al, Artificial nighttime lighting impacts visual ecology links between flowers, pollinators and predators, Nature Communications<\/i> (2021). DOI: 10.1038\/s41467-021-24394-0<\/a><\/p><\/div>\n
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\n University of Exeter
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Citation<\/strong>:
\n Light pollution has complex effects on animal vision (2021, July 6)
\n retrieved 6 July 2021
\n from https:\/\/phys.org\/news<\/a>\/2021-07-pollution-complex-effects-animal-vision.html<\/p>\n

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
\n part may be reproduced without the written permission. The content is provided for information purposes only.<\/p><\/div>\n<\/p><\/div>\n