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Holveck, M.-J.; Grégoire, A.; Doutrelant, C.; Lambrechts, M.M. |
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Title |
Nest height is affected by lamppost lighting proximity in addition to nestbox size in urban great tits |
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Journal Article |
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2018 |
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Journal of Avian Biology |
Abbreviated Journal |
J Avian Biol |
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in press |
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Animals |
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Both natural and artificial light have proximate influences on many aspects of avian biology, physiology and behaviour. To date artificial light at night is mostly considered as being a nuisance disrupting for instance sleep and reproduction of diurnal species. Here, we investigate if lamppost night lighting affects cavity‐nesting bird species inside their breeding cavity. Nest height in secondary cavity‐nesting species is the result of trade‐offs between several selective forces. Predation is the prevailing force leading birds to build thin nests to increase the distance towards the entrance hole. A thin nest may also limit artificial light exposure at night. Yet, a minimum level of daylight inside nesting cavities is necessary for adequate visual communication and/or offspring development. Against this background, we hypothesised that avian nest‐building behaviour varies in response to a change in night lighting. We monitored nest height of urban great tits (Parus major) during six years and found that it varied with artificial light proximity. The birds built thinner nests inside nestboxes of various sizes in response to increasing lamppost night light availability at the nest. In large nestboxes, the nests were also thinner when a lamppost was present in the territory. Whether this relationship between artificial night lighting and nest height reflects a positive or negative effect of urbanisation is discussed in the light of recent experimental studies conducted in rural populations by other research groups. |
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0908-8857 |
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GFZ @ kyba @ |
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2062 |
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Author |
Maggi, E.; Benedetti-Cecchi, L. |
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Title |
Trophic compensation stabilizes marine primary producers exposed to artificial light at night |
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Journal Article |
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2018 |
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Marine Ecology Progress Series |
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Mar. Ecol. Prog. Ser. |
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606 |
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1-5 |
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Plants; Animals; Ecology |
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Artificial light at night (ALAN) is a widespread phenomenon along coastal areas. Despite increasing evidence of pervasive effects of ALAN on patterns of species distribution and abundance, the potential of this emerging threat to alter ecological processes in marine ecosystems has remained largely unexplored. Here, we show how exposure to white LED lighting, comparable to that experienced along local urbanized coasts, significantly enhanced the impact of grazing gastropods on epilithic microphytobenthos (MPB). ALAN increased both the photosynthetic biomass of MPB and the grazing pressure of gastropods, such that consumers compensated for the positive effect of night lighting on primary producers. Our results indicate that trophic interactions can provide a stabilizing compensatory mechanism against ALAN effects in natural food webs. |
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0171-8630 |
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GFZ @ kyba @ |
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2063 |
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Wang, J., Zhang, J., Gong, L., Li, Q., Zhou, D. |
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Seismic Indirect Economic Loss Assessment and Recovery Evaluation Using Night-time Light Images – Application for Wenchuan Earthquake |
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Journal Article |
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2018 |
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Natural Hazards and Earth System Sciences |
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In press |
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Remote Sensing; Economics |
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Seismic indirect economic loss not only has a major impact on regional economic recovery policies, but also related to the economic assistance at the national level. Due to the Cross-regional economic activities and the difficulty of obtaining data, it's difficult that the indirect economic loss survey covers all economic activities. However, night-time light in an area can reflect the economic activity of the region. This paper focuses on the indirect economic losses caused by the Wenchuan earthquake in 2008 and evaluated the progress of restoration and reconstruction based on night-time light Images. First, the functional relationship between GDP and night-time light parameters was established based on the pre-earthquake data. Next, the indirect loss of the earthquake was evaluated by the night-time light attenuation in the disaster area after the earthquake. Then, the capacity recovery, which is characterized by the brightness recovery process of the light area, was evaluated. Lastly, the process of light expansion in the disaster area was analyzed to evaluate the economic expansion speed and efficiency. |
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NC @ ehyde3 @ |
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2064 |
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Author |
Van der Westhuyzen, J.G.J., Leuschner, F.W. |
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Title |
The effect of age on white light perception |
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Journal Article |
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Year |
2018 |
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International Journal of Sustainable Lighting |
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20 |
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2 |
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29-43 |
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Vision; Psychology |
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The way that persons from different age groups experience “white light” is investigated. Human eye lens transmission changes spectrally with age and this may influence the way that humans from different ages experiences light. Such a difference may be important in industrial and medical environments. Two different age groups, one group younger than 40 years of age and another group older than 50 years of age were subjected to the same “white” definition task.A conventional single-booth setup was used where observers were able to adjust the intensity of four coloured LED’s.Results of the psychophysical test procedure were used to generate specifications of two light sources, as selected by the two age groups. The two age groups selected different light sources when tasked to achieve a “perception” of white. Results show that the older group prefers a source with a colour rendering index number of 89 and the younger group prefers a source with a colour rendering index number of 74. The sources selectedby the two age groups specifycorrelated colour temperature values of 5150 K for the older age group and 6592 K for the younger group. |
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NC @ ehyde3 @ |
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2065 |
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Bará, S.; Lima, R.C. |
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Title |
Photons without borders: quantifying light pollution transfer between territories |
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Journal Article |
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Year |
2018 |
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International Journal of Sustainable Lighting |
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20 |
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2 |
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51-61 |
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Keywords |
Skyglow |
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The light pollution levels experienced at any given site generally depend on a wide number of artificial light sources distributed throughout the surrounding territory. Since photons can travel long distances before being scattered by the atmosphere, any effective proposal for reducing local light pollution levels needs an accurate assessment of the relative weight of all intervening light sources, including those located tens or even hundreds of km away. In this paper we describe several ways of quantifying and visualizing these relative weights. Particular emphasis is made on the aggregate contribution of the municipalities, which are -in many regions of the world- the administrative bodies primarily responsible for the planning and maintenance of public outdoor lighting systems. |
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NC @ ehyde3 @ |
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2066 |
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