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Author |
Escofet, J.; Bará, S. |
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Title |
Reducing the circadian input from self-luminous devices using hardware filters and software applications |
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Journal Article |
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Year |
2015 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Res. & Tech. |
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Volume |
49 |
Issue |
4 |
Pages |
481-496 |
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Keywords |
Lighting; devices; circadian disruption; screens; self-luminous |
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Abstract |
The widespread use of self-luminous devices at nighttime (cell-phones, computers, and tablets) raises some reasonable concerns regarding their effects on human physiology. Light at night is a known circadian disruptor, particularly at short visible wavelengths, and it seems advisable to have practical tools for tailoring the spectral radiance of these displays. We analyse two possible strategies to achieve this goal, using hardware filters or software applications. Overall, software applications seem to offer, at the present time, the best trade-offs for controlling the light spectra emitted by existing devices. We submit that such tools should be included as a standard feature on any self-luminous device and that their default settings should be established according to the best available knowledge on the circadian effects of light. |
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Departament d'Òptica i Optometria, Universitat Politècnica de Catalunya, Terrassa, Catalunya, Spain; salva.bara(at)usc.es |
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SAGE |
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English |
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English |
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1477-1535 |
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IDA @ john @ |
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1315 |
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Author |
Zamorano, J.; Sánchez de Miguel, A.; Ocaña, F.; Pila-Diez, B.; Gómez Castaño, J.; Pascual, S.; Tapia, C.; Gallego, J.; Fernandez, A.; Nievas, M. |
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Title |
Testing sky brightness models against radial dependency: a dense two dimensional survey around the city of Madrid, Spain |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
Abbreviated Journal |
JQSRT |
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Volume |
181 |
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Pages |
52-66 |
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Keywords |
Skyglow; measurements; light pollution; artificial light at night; modeling; Madrid; Spain |
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Abstract |
We present a study of the night sky brightness around the extended metropolitan area of Madrid using Sky Quality Meter (SQM) photometers. The map is the first to cover the spatial distribution of the sky brightness in the center of the Iberian peninsula. These surveys are neccessary to test the light pollution models that predict night sky brightness as a function of the location and brightness of the sources of light pollution and the scattering of light in the atmosphere. We describe the data-retrieval methodology, which includes an automated procedure to measure from a moving vehicle in order to speed up the data collection, providing a denser and wider survey than previous works with similar time frames. We compare the night sky brightness map to the nocturnal radiance measured from space by the DMSP satellite. We find that i) a single source model is not enough to explain the radial evolution of the night sky brightness, despite the predominance of Madrid in size and population, and ii) that the orography of the region should be taken into account when deriving geo-specific models from general first-principles models. We show the tight relationship between these two luminance measures. This finding sets up an alternative roadmap to extended studies over the globe that will not require the local deployment of photometers or trained personnel. |
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Dept. Astrof´ısica y CC. de la Atm´osfera, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid, Spain |
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IDA @ john @ |
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1323 |
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Author |
Labuda, M.; Koch, R.; Nagyová, A. |
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Title |
“Dark Sky Parks” as measure to support nature tourism in large protection areas – case study in the Nature Park “Nossentiner/Schwinzer Heide” |
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Journal Article |
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Year |
2015 |
Publication |
Naturschutz und Landschaftsplanung |
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47 |
Issue |
12 |
Pages |
380-388 |
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Keywords |
Society; dark sky parks; tourism; astrotourism; economic impact; economics; economic benefit; Germany |
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Abstract |
Some of the key characteristics of environmentally compatible. tourism are the minimisation of negative impacts on the environment and the preservation of the ecological capacity. “Dark Sky Parks” are one of the important measures to support nature tourism in large protection areas. Using the example of the Nature Park “Nossentiner/Schwinzer Heide” the paper introduces a concept of 'astrotourism': measurements of the brightness (magnitude) of the nocturnal sky, selection of suitable sites for astronomic observations, development of a lighting plan which mainly aims to define rules and guidelines for the outdoor lighting, and measures to protect the nocturnal sky and reduce the light pollution in the future Dark Sky Park. The region of the Nature Park Nossentiner/Schwinzer Heide is characterised by a minor light pollution, due to a low settlement density and its large, coherent forest areas. This fact contributes to the protection of nocturnal species and it can be used for the future tourism concept in the protection area. The presented concept to develop nature tourism shows a reaction on one of the fastest environmental changes: the decreasing intensity of natural darkness due to artificial light sources. |
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Eugen Ulmer KG |
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0940-6808 |
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IDA @ john @ |
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1341 |
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Author |
Rodríguez Martín, A.; Chiaradia, A.; Wasiak, P.; Renwick, L.; Dann, P. |
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Title |
Waddling on the Dark Side: Ambient Light Affects Attendance Behavior of Little Penguins |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Biological Rhythms |
Abbreviated Journal |
J Biol Rhythms |
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0748730415626010 |
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Keywords |
Animals; birds; penguins; attendance; little penguin; Eudyptula minor; Phillip Island; Australia; photobiology; seabirds |
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Abstract |
Visible light on Earth largely comes from the sun, including light reflected from the moon. Predation risk is strongly determined by light conditions, and some animals are nocturnal to reduce predation. Artificial lights and its consequent light pollution may disrupt this natural behavior. Here, we used 13 years of attendance data to study the effects of sun, moon, and artificial light on the attendance pattern of a nocturnal seabird, the little penguin Eudyptula minor at Phillip Island, Australia. The little penguin is the smallest and the only penguin species whose activity on land is strictly nocturnal. Automated monitoring systems recorded individually marked penguins every time they arrived (after sunset) at or departed (before sunrise) from 2 colonies under different lighting conditions: natural night skylight and artificial lights (around 3 lux) used to enhance penguin viewing for ecotourism around sunset. Sunlight had a strong effect on attendance as penguins arrived on average around 81 min after sunset and departed around 92 min before sunrise. The effect of moonlight was also strong, varying according to moon phase. Fewer penguins came ashore during full moon nights. Moon phase effect was stronger on departure than arrival times. Thus, during nights between full moon and last quarter, arrival times (after sunset) were delayed, even though moonlight levels were low, while departure times (before sunrise) were earlier, coinciding with high moonlight levels. Cyclic patterns of moon effect were slightly out of phase but significantly between 2 colonies, which could be due to site-specific differences or presence/absence of artificial lights. Moonlight could be overridden by artificial light at our artificially lit colony, but the similar amplitude of attendance patterns between colonies suggests that artificial light did not mask the moonlight effect. Further research is indeed necessary to understand how seabirds respond to the increasing artificial night light levels. |
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Department of Evolutionary Ecology, Estación Biológica de Doñana, Consejo Superior de Investigaciones CientÃficas, Avda. Américo Vespucio s/n, 41092 Seville, Spain; airamrguez(at)ebd.csic.es |
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SAGE |
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English |
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English |
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0748-7304 |
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IDA @ john @ |
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1345 |
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Author |
Le Tallec, T.; Théry, M.; Perret, M. |
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Title |
Melatonin concentrations and timing of seasonal reproduction in male mouse lemurs (Microcebus murinus) exposed to light pollution |
Type |
Journal Article |
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Year |
2016 |
Publication |
Journal of Mammalogy |
Abbreviated Journal |
J of Mammalogy |
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Volume |
97 |
Issue |
3 |
Pages |
753-760 |
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Keywords |
Animals; light pollution; photobiology; core temperature; locomotor activity; melatonin; Microcebus murinus; primate; testosterone; lemurs; mouse lemur |
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Adverse effects of light at night are associated with human health problems and with changes in seasonal reproduction in several species. Owing to its role in the circadian timing system, melatonin production is suspected to mediate excess nocturnal light. To test this hypothesis, we examined the effect of light pollution on the timing of seasonal reproduction on a strict Malagasy long-day breeder, the nocturnal mouse lemur (Microcebus murinus). We randomly exposed 12 males in wintering sexual rest to moonlight or to a light-mimicking nocturnal streetlight for 5 weeks. We monitored urinary 6-sulfatoxymelatonin concentrations (aMT6s), plasma testosterone concentrations, and testis size, and we recorded daily rhythms of core temperature and locomotor activity. In males exposed to light pollution, we observed a significant decrease in urinary aMT6s concentrations associated with changes in daily rhythm profiles and with activation of reproductive function. These results showed that males entered spontaneous sexual recrudescence leading to a summer acclimatization state, which suggests that light at night disrupts perception of day length cues, leading to an inappropriate photoentrainment of seasonal rhythms. |
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Address |
UMR 7179 Centre National de la Recherche Scientifique, Muséum National d’Histoire Naturelle , 1 avenue du petit château, 91800 Brunoy, France; thery(at)mnhn.fr |
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Oxford University Press |
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English |
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English |
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IDA @ john @ |
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1348 |
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