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Author Bolshakov, C.V.; Bulyuk, V.N.; Sinelschikova, A.Y.; Vorotkov, M.V.
Title Influence of the vertical light beam on numbers and flight trajectories of night-migrating songbirds Type Journal Article
Year 2013 Publication Avian Ecol. Behav. Abbreviated Journal
Volume 24 Issue (up) Pages 35–49
Keywords Animals; nocturnal migration; light pollution; numbers; flight track; extrinsic factors
Abstract In this paper we analyse the data obtained in the automatic regime by the Optical Electronic Device (OED, Vorotkov et al. 2009; Bolshakov et al. 2010) for autumn nocturnal passage of passerines on the Courish Spit on the Baltic Sea and estimate: (1) numbers aloft under differ- ent types of wind (following wind, opposing wind and calm conditions); (2) flight trajectories in the 5° cone of white light. We found that under natural nocturnal illumination conditions, the vertical cone of white light impacts the detectable numbers aloft and disturbs straight flight trajectories. The OED data obtained throughout the night suggest, after correction for ground speed and the mean flight altitude, the actual number of birds in the light cone peaks at calm conditions, is halved under following winds which are optimal for passage and is 21 times lower under unfavourable headwinds. It is assumed that high numbers in the light cone under calm conditions is an artefact of bird attraction by light and their concentration around the searchlights. The OED data obtained for midnight ±1 hour, flying migrants respond to the vertical light cone under all types of wind conditions by altering their straight flight trajec- tories. However, this response is most apparent in still air conditions. The proportion of birds that change their flight track reaches 43%. We assume that under such conditions some birds are not only attracted to the illuminated zone at low altitudes, but, besides slowing down their ground speed, change their trajectories to the degree of flying in circles. To determine combi- nations of factors and to test for their possible impact on the probability of response to light, we used a binary logistic regression. The presence of birds with straight vs. curved tracks was used as the dependent variable. Final logistic models obtained for midnight ±1 hour for calm conditions and headwinds, suggest that occurrence probability of songbirds with curvilinear flight tracks is higher for small birds, when no or just a small part of Moon disk is visible and under high air humidity. Under headwinds the probability of occurrence of birds flying curvi- linear tracks is also higher under overcast. For following winds, the probability of occurrence birds flying curvilinearly was higher when many small birds were aloft, when air humidity was high and when wind was not strictly following. Unlike other wind situations, this model did not include the size of visible part of the Moon disk as a significant factor. The increase of occurrence of curvilinear flight tracks through the light beam when winds were not exactly following was probably caused by the problems with compensating the lateral component of tailwinds under high velocities, especially by small birds.
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Call Number LoNNe @ christopher.kyba @ Serial 378
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Author Romeo, S. et al.
Title Bright light exposure reduces TH-positive dopamine neurons: implications of light pollution in Parkinson's disease epidemiology Type Journal Article
Year 2013 Publication Scientific Reports Abbreviated Journal
Volume 3 Issue (up) Pages
Keywords Animals; Parkinson's disease; Cell death in the nervous system; Neural ageing; Risk factors
Abstract This study explores the effect of continuous exposure to bright light on neuromelanin formation and dopamine neuron survival in the substantia nigra. Twenty-one days after birth, Sprague–Dawley albino rats were divided into groups and raised under different conditions of light exposure. At the end of the irradiation period, rats were sacrificed and assayed for neuromelanin formation and number of tyrosine hydroxylase (TH)-positive neurons in the substantia nigra. The rats exposed to bright light for 20 days or 90 days showed a relatively greater number of neuromelanin-positive neurons. Surprisingly, TH-positive neurons decreased progressively in the substantia nigra reaching a significant 29% reduction after 90 days of continuous bright light exposure. This decrease was paralleled by a diminution of dopamine and its metabolite in the striatum. Remarkably, in preliminary analysis that accounted for population density, the age and race adjusted Parkinson's disease prevalence significantly correlated with average satellite-observed sky light pollution.
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Call Number LoNNe @ christopher.kyba @ Serial 382
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Author Bedrosian, T.A.; Weil, Z.M.; Nelson, R.J.
Title Chronic dim light at night provokes reversible depression-like phenotype: possible role for TNF Type Journal Article
Year 2013 Publication Molecular Psychiatry Abbreviated Journal
Volume 18 Issue (up) Pages 930-936
Keywords Animals
Abstract The prevalence of major depression has increased in recent decades and women are twice as likely as men to develop the disorder. Recent environmental changes almost certainly have a role in this phenomenon, but a complete set of contributors remains unspecified. Exposure to artificial light at night (LAN) has surged in prevalence during the past 50 years, coinciding with rising rates of depression. Chronic exposure to LAN is linked to increased risk of breast cancer, obesity and mood disorders, although the relationship to mood is not well characterized. In this study, we investigated the effects of chronic exposure to 5 lux LAN on depression-like behaviors in female hamsters. Using this model, we also characterized hippocampal brain-derived neurotrophic factor expression and hippocampal dendritic morphology, and investigated the reversibility of these changes 1, 2 or 4 weeks following elimination of LAN. Furthermore, we explored the mechanism of action, focusing on hippocampal proinflammatory cytokines given their dual role in synaptic plasticity and the pathogenesis of depression. Using reverse transcription-quantitative PCR, we identified a reversible increase in hippocampal tumor necrosis factor (TNF), but not interleukin-1β, mRNA expression in hamsters exposed to LAN. Direct intracerebroventricular infusion of a dominant-negative inhibitor of soluble TNF, XPro1595, prevented the development of depression-like behavior under LAN, but had no effect on dendritic spine density in the hippocampus. These results indicate a partial role for TNF in the reversible depression-like phenotype observed under chronic dim LAN. Recent environmental changes, such as LAN exposure, may warrant more attention as possible contributors to rising rates of mood disorders.
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Call Number LoNNe @ christopher.kyba @ Serial 386
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Author Lyytimäki, J.
Title Nature's nocturnal services: Light pollution as a non-recognised challenge for ecosystem services research and management Type Journal Article
Year 2013 Publication Ecosystem Services Abbreviated Journal Ecosystem Services
Volume 3 Issue (up) Pages e44-e48
Keywords Economics; Ecosystem disservices; Ecosystem services; Environmental management; Light pollution; Scotoecology; Shifting baselines
Abstract Research focusing on ecosystem services has tackled several of the major drivers of environmental degradation, but it suffers from a blind spot related to light pollution. Light pollution caused by artificial night-time lighting is a global environmental change affecting terrestrial, coastal and marine ecosystems. The long-term effects of the disruption of the natural cycles of light and dark on ecosystem functioning and ecosystem services are largely unknown. Even though additional research is clearly needed, identifying, developing and implementing stringent management actions aimed at reducing inadequately installed, unnecessary or excessive lighting are well justified. This essay argues that management is hampered, because ecosystem services from nocturnal nature are increasingly underappreciated by the public due to shifting baseline syndrome, making most people accustomed to constantly illuminated and light-polluted night environments. Increased attention from scientists, managers and the public is needed in order to explicate the best options for preserving the benefits from natural darkness.
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Call Number LoNNe @ christopher.kyba @ Serial 433
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Author Snyder, J.D.; Bullough, J.D.; Radetsky, L.C.
Title Innovative Roadway Light Source and Dye Combinations to Improve Visibility and Reduce Environmental Impacts. Type Journal Article
Year 2013 Publication National Technical Information Service report Abbreviated Journal
Volume Issue (up) Pages
Keywords Lighting Systems
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Call Number LoNNe @ christopher.kyba @ Serial 444
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