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Author |
Sanders, D.; Gaston, K.J. |
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Title |
How ecological communities respond to artificial light at night |
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Journal Article |
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Year |
2018 |
Publication |
Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology |
Abbreviated Journal |
J Exp Zool A Ecol Integr Physiol |
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Volume |
329 |
Issue |
8-9 |
Pages |
394-400 |
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Keywords |
Ecology |
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Abstract |
Many ecosystems worldwide are exposed to artificial light at night (ALAN), from streetlights and other sources, and a wide range of organisms has been shown to respond to this anthropogenic pressure. This raises concerns about the consequences for major ecosystem functions and their stability. However, there is limited understanding of how whole ecological communities respond to ALAN, and this cannot be gained simply by making predictions from observed single species physiological, behavioral, or ecological responses. Research needs to include an important building block of ecological communities, namely the interactions between species that drive ecological and evolutionary processes in ecosystems. Here, we summarize current knowledge about community responses to ALAN and illustrate different pathways and their impact on ecosystem functioning and stability. We discuss that documentation of the impact of ALAN on species interaction networks and trait distributions provides useful tools to link changes in community structure to ecosystem functions. Finally, we suggest several approaches to advance research that will link the diverse impact of ALAN to changes in ecosystems. |
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Wissenschaftskolleg zu Berlin, Institute for Advanced Study, Berlin, Germany |
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2471-5638 |
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PMID:29656458 |
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Call Number |
GFZ @ kyba @ |
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1857 |
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Author |
Preciado, O.; Manzano, E. |
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Title |
Spectral characteristics of road surfaces and eye transmittance: Effects on energy efficiency of road lighting at mesopic levels |
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Journal Article |
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Year |
2017 |
Publication |
Lighting Research & Technology |
Abbreviated Journal |
Lighting Research & Technology |
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147715351771822 |
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Keywords |
Vision; Lighting |
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In 2010, the CIE published a recommended system for mesopic photometry based on visual performance. According to this system, scenes illuminated at mesopic levels with light sources of high S/P ratio, will produce better visual performance than those illuminated with light sources of a lower S/P ratio at equal photopic luminance. However, there could be other factors affected by SPD that, when quantified, could lead to a contradictory final effect. The scope of this paper was to evaluate how road lighting is affected by the spectral road surface reflectance and by the human eye transmittance as people get older. Our results suggest that the benefits of considering the mesopic vision effect for light sources with high S/P ratios are totally counteracted by the other two effects at mesopic luminances between 0.75 cd/m2 and 1.73 cd/m2 for people between 20 and 60 years of age, depending on the light source and the age of observers. |
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1477-1535 |
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GFZ @ kyba @ |
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1862 |
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Do, Q.-T.; Shapiro, J.N.; Elvidge, C.D.; Abdel-Jelil, M.; Ahn, D.P.; Baugh, K.; Hansen-Lewis, J.; Zhizhin, M.; Bazilian, M.D. |
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Terrorism, geopolitics, and oil security: Using remote sensing to estimate oil production of the Islamic State |
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Journal Article |
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Year |
2018 |
Publication |
Energy Research & Social Science |
Abbreviated Journal |
Energy Research & Social Science |
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44 |
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411-418 |
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Keywords |
Remote Sensing; Economics |
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As the world’s most traded commodity, oil production is typically well monitored and analyzed. It also has established links to geopolitics, international relations, and security. Despite this attention, the illicit production, refining, and trade of oil and derivative products occur all over the world and provide significant revenues outside of the oversight and regulation of governments. A prominent manifestation of this phenomenon is how terrorist and insurgent organizations—including the Islamic State group, also known as ISIL/ISIS or Daesh—use oil as a revenue source. Understanding the spatial and temporal variation in production can help determine the scale of operations, technical capacity, and revenue streams. This information, in turn, can inform both security and reconstruction strategies. To this end, we use satellite multi-spectral imaging and ground-truth pre-war output data to effectively construct a real-time census of oil production in areas controlled by the ISIL terrorist group. More broadly, remotely measuring the activity of extractive industries in conflict-affected areas without reliable administrative data can support a broad range of public policy and decisions and military operations. |
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2214-6296 |
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GFZ @ kyba @ |
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1864 |
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Author |
Grenis, K.; Murphy, S.M. |
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Title |
Direct and indirect effects of light pollution on the performance of an herbivorous insect |
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Journal Article |
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Year |
2018 |
Publication |
Insect Science |
Abbreviated Journal |
Insect Sci |
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Volume |
26 |
Issue |
4 |
Pages |
770-776 |
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Keywords |
Animals; Plants |
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Light pollution is a global disturbance with resounding impacts on a wide variety of organisms, but our understanding of these impacts is restricted to relatively few higher vertebrate species. We tested the direct effects of light pollution on herbivore performance as well as indirect effects mediated by host plant quality. We found that artificial light from streetlights alters plant toughness. Additionally, we found evidence of both direct and indirect effects of light pollution on the performance of an herbivorous insect, which indicates that streetlights can have cascading impacts on multiple trophic levels. Our novel findings suggest that light pollution can alter plant-insect interactions and thus may have important community-wide consequences. |
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Department of Biological Sciences, University of Denver, Denver, Colorado, USA |
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1672-9609 |
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PMID:29425403 |
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no |
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Call Number |
GFZ @ kyba @ |
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1865 |
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Author |
Petržala, J. |
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Title |
Feasibility of inverse problem solution for determination of city emission function from night sky radiance measurements |
Type |
Journal Article |
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Year |
2018 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
Abbreviated Journal |
Journal of Quantitative Spectroscopy and Radiative Transfer |
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Volume |
213 |
Issue |
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Pages |
86-94 |
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Keywords |
Skyglow |
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Abstract |
The knowledge of the emission function of a city is crucial for simulation of sky glow in its vicinity. The indirect methods to achieve this function from radiances measured over a part of the sky have been recently developed. In principle, such methods represent an ill-posed inverse problem. This paper deals with the theoretical feasibility study of various approaches to solving of given inverse problem. Particularly, it means testing of fitness of various stabilizing functionals within the Tikhonov’s regularization. Further, the L-curve and generalized cross validation methods were investigated as indicators of an optimal regularization parameter. At first, we created the theoretical model for calculation of a sky spectral radiance in the form of a functional of an emission spectral radiance. Consequently, all the mentioned approaches were examined in numerical experiments with synthetical data generated for the fictitious city and loaded by random errors. The results demonstrate that the second order Tikhonov’s regularization method together with regularization parameter choice by the L-curve maximum curvature criterion provide solutions which are in good agreement with the supposed model emission functions. |
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0022-4073 |
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GFZ @ kyba @ |
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1868 |
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