| Records |
| Author |
Villamizar, N.; GarcÃa-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 |
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Journal Article |
| Year |
2009 |
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| Volume |
292 |
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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 − 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 < λ < 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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LoNNe @ schroer @ |
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1606 |
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| Author |
Blair, A. |
| Title |
Sark in the Dark: Wellbeing and Community on the Dark Sky Island of Sark |
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Book Whole |
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2016 |
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Society; ecopsychology; environmental psychology; psychology |
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Studies of the beneficial and transformative qualities of encounters with nature typically focus on ‘green’ or grounded nature. In 'Sark in the Dark', Ada Blair shifts this focus upwards to a refreshing encounter with the richness of the dark night sky. In this book, she documents the research she conducted while at the University of Wales Trinity Saint David into the culture and history of the world’s first designated Dark Sky Island. Through a series of interviews with Sark residents, as well as poignant self-reflections, Blair explores the importance of the dark sky on human wellbeing and community. |
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caladach(at)gmail.com |
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Sophia Centre Press |
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English |
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English |
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Sophia Centre Master Monographs |
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978-1-907767-42-5 |
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IDA @ john @ |
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1780 |
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Rice Kinder Institute for Urban Research |
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What Happens in the Shadows: Streetlights and How They Relate To Crime |
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Journal Article |
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2017 |
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Crime; Lighting |
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After finding in a previous report, “Streetlights in the City: Understanding the Distribution of Houston Streetlights,” that the city of Houston’s more than 173,000 streetlights were not evenly distributed throughout the city, this next report answers the question: do places with more streetlights have lower crime rates?
The findings complicate the common perception that more streetlights lead to fewer crimes. While there was some evidence that a particularly high density of streetlights can provide protective benefits, excluding those extremes provides a much muddier picture, suggesting that crime is a reflection of other neighborhood contexts. As such, cities should be cautious in expecting direct reductions in crime with the introduction of more streetlights. |
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LoNNe @ kyba @ |
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1804 |
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| Author |
Martinez, L. R. |
| Title |
How Much Should We Trust the Dictator's GDP Estimates? |
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2018 |
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Economics; Remote Sensing |
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I study the manipulation of GDP statistics in weak and non-democracies. I show that the elasticity of official GDP figures to nighttime lights is systematically larger in more authoritarian regimes. This autocracy gradient in the night-lights elasticity of GDP cannot be explained by differences in a wide range of factors that may affect the mapping of night lights to GDP, such as economic structure, statistical capacity, rates of urbanization or electrification. The gradient is larger when there is a stronger incentive to exaggerate economic performance (years of low growth, before elections or after becoming ineligible for foreign aid) and is only present for GDP sub-components that rely on government information and have low third-party verification. The results indicate that yearly GDP growth rates are inflated by a factor of between 1.15 and 1.3 in the most authoritarian regimes. Correcting for manipulation substantially changes our understanding of comparative economic performance at the turn of the XXI century. |
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GFZ @ kyba @ |
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1926 |
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| Author |
Shirkey, R. C. |
| Title |
A Model for Nighttime Urban Illumination |
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Journal Article |
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2006 |
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Skyglow |
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The Army increasingly relies on night operations to accomplish its objectives. These night operations frequently require using Night Vision Goggles and other light-sensitive devices which are strongly affected by ambient lighting, a large component of which is urban. An urban illumination model is proposed for use in tactical decision aids and wargames which would allow for more accurate prediction of target acquisition ranges and increased realism in simulations. This model will build on previous research that predicts broadband brightness as a function of population and distance from the city center. Since city population and aerosols affect light distributions, the model is being extended and generalized for multiple city types and natural and man-made aerosols. An overview of the model along with future improvements will be presented. |
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ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM COMPUTATIONAL AND INFORMATION SCIENCE DIRECTORATE |
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ADA497505 |
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GFZ @ kyba @ |
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1977 |
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