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Author Villamizar, N.; García-Alcazar, A.; Sánchez-Vázquez, F. J.
Title Effect of light spectrum and photoperiod on the growth, development and survival of European sea bass (Dicentrarchuslabrax) larvae Type Journal Article
Year 2009 Publication Abbreviated Journal
Volume 292 Issue 1-2 Pages 80-86
Keywords animals; fish; light spectrum; photoperiod
Abstract This study investigates how the characteristics (spectrum and photoperiod) of artificial light affect European sea bass eggs and larvae from &#8722; 1 to 40 days post-hatching. Fertilised eggs and larvae were reared under five different light treatments: 12L:12D red light (LDR; half-peak bandwidth = 641–718 nm), 12L:12D blue light (LDB; half-peak bandwidth = 435–500 nm), 12L:12D broad-spectrum white light (LDW; 367 < &#955; < 1057 nm), 24L:0D broad-spectrum white light (LL) and 0L:24D (DD). The results showed that total length at day post-hatching 40 was significantly larger in larvae reared under LDB (15.4 ± 0.6 mm) and LL (15.2 ± 0.6 mm) than in larvae reared under LDR (11.7 ± 0.7 mm). Overall wet weight was highest under LDB (21.6 ± 2.02 mgr) and lowest in LDR larvae (13.6 ± 1.48 mgr). Yolk sac and oil globule absorption occurred more slowly in LDR and DD larvae, while LDB larvae developed their fin, teeth and swim bladder significantly earlier than the rest of the groups. DD larvae were unable to capture food and mortality was 100% by day post-hatching 18, while LDR larvae did not feed on rotifers, but fed on Artemia from day post-hatching 16 onwards. The best survival was obtained with the LL treatment, although significantly more problems with swim bladder development and lower jaw malformations were also identified in this group. In summary, these results highlight the key role of the light spectrum and photoperiod for European sea bass larvae, the best performance being achieved under the light conditions that best approached those of their natural aquatic environment (LDB). These findings should be considered when designing rearing protocols for larvae in aquaculture.
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Call Number LoNNe @ schroer @ Serial 1606
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Author Alessandro Manfrin, Gabriel Singer, Stefano Larsen, Nadine Weiss, Roy H. A. van Grunsven, Nina-Sophie Weiss, Stefanie Wohlfahrt, Michael T. Monaghan and Franz Hölker
Title Artificial light at night affects organism flux across ecosystem boundaries and drives community structure in the recipient ecosystem Type Journal Article
Year 2017 Publication Frontiers in Environmental Science Abbreviated Journal
Volume 5 Issue 61 Pages
Keywords Animals; Ecology
Abstract Artificial light at night (ALAN) is a widespread alteration of the natural environment that can affect the functioning of ecosystems. ALAN can change the movement patterns of freshwater animals that move into the adjacent riparian and terrestrial ecosystems, but the implications for local riparian consumers that rely on these subsidies are still unexplored. We conducted a two-year field experiment to quantify changes of freshwater-terrestrial linkages by installing streetlights in a previously light-native riparian area adjacent to an agricultural drainage ditch. We compared the abundance and community composition of emerging aquatic insects, flying insects, and ground-dwelling arthropods with an unlit control site. Comparisons were made within and between years using generalized least squares and a BACI design (Before-After Control-Impact). Aquatic insect emergence, the proportion of flying insects that were aquatic in origin, and the total abundance of flying insects all increased in the ALAN-illuminated area. The abundance of several night-active ground-dwelling predators (Pachygnatha clercki, Trochosa sp., Opiliones) increased under ALAN and their activity was extended into the day. Conversely, the abundance of nocturnal ground beetles (Carabidae) decreased under ALAN. The changes in composition of riparian predator and scavenger communities suggest that the increase in aquatic-to-terrestrial subsidy flux may cascade through the riparian food web. The work is among the first studies to experimentally manipulate ALAN using a large-scale field experiment, and provides evidence that ALAN can affect processes that link adjacent ecosystems. Given the large number of streetlights that are installed along shorelines of freshwater bodies throughout the globe, the effects could be widespread and represent an underestimated source of impairment for both aquatic and riparian systems.
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Call Number LoNNe @ kyba @ Serial 1746
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Author Albreiki, Mohammed S.
Title The effects of light at night and/or melatonin on hormones, metabo- lites, appetite control, vascular function, and behavioural responses. Type Journal Article
Year 2017 Publication University of Surrey Abbreviated Journal
Volume Issue Pages
Keywords Human Health
Abstract Light at night (LAN) is a major factor in disruption of SCN function, including melatonin suppression. Melatonin has been linked to a variety of biological processes such as lipid and glucose metabolism, vascular parameters, appetite, and behaviour. However, few human studies have investigated the effect of LAN and suppressed melatonin prior to and after an evening meal. The current thesis aims to investigate the impact of light at night and/or mela- tonin on hormones, metabolites, appetite, vascular function, and behaviour prior to and after an evening test meal in healthy participants. The first study investigated the effect of dim or bright light conditions on hor- mones, metabolites, appetite, vascular function and behavioural responses. Glucose tolerance and insulin sensitivity were reduced, lipid profiles altered and salivary melatonin suppressed under bright light compared to dim light conditions. Subjec- tive mood was improved and appetite scores increased in bright light. No differences were seen in vascular parameters. Although clear differences were apparent it could not be determined whether the effects were due to the light at night, the absence of melatonin or a combination of the two. The second study involved three conditions with the administration of exogenous melatonin 90 mins before the evening test meal under bright and dim light conditions compared to bright light alone with the consequent melatonin suppression. Glucose tolerance and insulin sensitivity were reduced and lipid profile altered in bright light when melatonin was suppressed compared to the two conditions with exogenous melatonin. Mood was improved and appetite increased with lower leptin levels and elevated wrist temperature with bright light and suppressed melatonin. Statistical analysis showed that the major effects were due to melatonin. These studies demonstrate a possible role for melatonin in glucose tolerance, insulin sensitivity and lipid metabolism when eating late at night which may have implications for shift-workers.
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Call Number LoNNe @ kyba @; GFZ @ kyba @ Serial 1747
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Author Zhe Song and Xiaoming Li
Title Hazards, Causes and Legal Governance Measures of China's Urban Light Pollution Type Journal Article
Year 2017 Publication Nature Environment and Pollution Technology Abbreviated Journal
Volume 16 Issue 3 Pages 975-980
Keywords Regulation
Abstract Urban light pollution, which poses a threat to people’s production, life, and physical and mental health, is becoming increasingly serious and gradually forms a new type of environmental pollution. In order to further analyse the hazards and causes of China’s urban light pollution and explore its legal governance measures, this study reviews foreign literature on hazards and causes of urban light pollution, summarizes the types and causes of the pollution in China, and provides specific control measures from the perspective of legal governance. Research results in the country and abroad show that light pollution is caused by development, which has a serious negative impact on the normal life of urban residents. The hazards of urban light pollution are manifested in four aspects, such as damaging human health, affecting the natural ecological environment, affecting normal operation of urban traffic, and causing serious waste of energy. Urban light pollution is caused by the lack of systematized urban building light source design work, excessive use of electronic products with the development of science and technology, weak public awareness of environmental protection, and the delay of laws and regulations. Some legal measures to control light pollution are presented as follows: Perfecting the administrative system and environmental supervision system in legislation, innovating the legislation system of light pollution prevention, formulating strict civil liability for light pollution, and further formulating a single law on light pollution control. The results of this study have important reference value for taking measures predictably to avoid the occurrence of light pollution during urban construction design, for the macro-control of urban planning and management departments, and for promoting the concept of urban environmental protection and energy conservation and sustainable urban development.
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Call Number LoNNe @ kyba @; GFZ @ kyba @ Serial 1748
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Author Kocifaj, M.
Title Towards a Comprehensive City Emission Function (CCEF) Type Journal Article
Year 2018 Publication Journal of Quantitative Spectroscopy and Radiative Transfer Abbreviated Journal JQSRT
Volume 205 Issue Pages 253-266
Keywords Lighting; Skyglow
Abstract The comprehensive city emission function (CCEF) is developed for a heterogeneous light-emitting or blocking urban environments, embracing any combination of input parameters that characterize linear dimensions in the system (size and distances between buildings or luminaires), properties of light-emitting elements (such as luminous building façades and street lighting), ground reflectance and total uplight-fraction, all of these defined for an arbitrarily sized 2D area. The analytical formula obtained is not restricted to a single model class as it can capture any specific light-emission feature for wide range of cities. The CCEF method is numerically fast in contrast to what can be expected of other probabilistic approaches that rely on repeated random sampling. Hence the present solution has great potential in light-pollution modeling and can be included in larger numerical models. Our theoretical findings promise great progress in light-pollution modeling as this is the first time an analytical solution to city emission function (CEF) has been developed that depends on statistical mean size and height of city buildings, inter-building separation, prevailing heights of light fixtures, lighting density, and other factors such as e.g. luminaire light output and light distribution, including the amount of uplight, and representative city size. The model is validated for sensitivity and specificity pertinent to combinations of input parameters in order to test its behavior under various conditions, including those that can occur in complex urban environments. It is demonstrated that the solution model succeeds in reproducing a light emission peak at some elevated zenith angles and is consistent with reduced rather than enhanced emission in directions nearly parallel to the ground.
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Publisher ScienceDirect Place of Publication Editor
Language English Summary Language English Original Title
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Call Number LoNNe @ kyba @ Serial 1757
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