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Author Zeitzer, J.M.; Dijk, D.-J.; Kronauer, R.E.; Brown, E.N.; Czeisler, C.A. url  doi
openurl 
  Title Sensitivity of the human circadian pacemaker to nocturnal light: melatonin phase resetting and suppression Type Journal Article
  Year 2000 Publication The Journal of Physiology Abbreviated Journal  
  Volume (down) 526 Issue 3 Pages 695-702  
  Keywords Human Health  
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  Corporate Author Thesis  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0022-3751 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ kagoburian @ Serial 839  
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Author Stockl, A.L.; Ribi, W.A.; Warrant, E.J. url  doi
openurl 
  Title Adaptations for nocturnal and diurnal vision in the hawkmoth lamina Type Journal Article
  Year 2015 Publication The Journal of Comparative Neurology Abbreviated Journal J Comp Neurol  
  Volume (down) 524 Issue 1 Pages 160–175  
  Keywords vision, animals  
  Abstract Animals use vision over a wide range of light intensities, from dim starlight to bright sunshine. For animals active in very dim light the visual system is challenged by several sources of visual noise. Adaptations in the eyes, as well as in the neural circuitry, have evolved to suppress the noise and enhance the visual signal, thereby improving vision in dim light. Among neural adaptations, spatial summation of visual signals from neighboring processing units is suggested to increase the reliability of signal detection and thus visual sensitivity. In insects, the likely neural candidates for carrying out spatial summation are the lamina monopolar cells (LMCs) of the first visual processing area of the insect brain (the lamina). We have classified LMCs in three species of hawkmoths having considerably different activity periods but very similar ecology – the diurnal Macroglossum stellatarum, the nocturnal Deilephila elpenor and the crepuscular-nocturnal Manduca sexta. Using this classification, we investigated the anatomical adaptations of hawkmoth LMCs suited for spatial summation. We found that specific types of LMCs have dendrites extending to significantly more neighboring cartridges in the two nocturnal and crepuscular species than in the diurnal species, making these LMC types strong candidates for spatial summation. Moreover, while the absolute number of cartridges visited by the LMCs differed between the two dim-light species, their dendritic extents were very similar in terms of visual angle, possibly indicating a limiting spatial acuity. Interestingly, the overall size of the lamina neuropil did not correlate with the size of its LMCs. This article is protected by copyright. All rights reserved.  
  Address Department of Biology, Lund University, 22362, Lund, Sweden  
  Corporate Author Thesis  
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  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0021-9967 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:26100612 Approved no  
  Call Number LoNNe @ christopher.kyba @ Serial 1190  
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Author Brüning A., Hölker, F., Franke, S., Preuer, T., Kloas, W. url  doi
openurl 
  Title Spotlight on fish: Light pollution affects circadian rhythms of European perch but does not cause stress Type Journal Article
  Year 2015 Publication Science of The Total Environment Abbreviated Journal Sci Total Environ  
  Volume (down) 511 Issue Pages 516-522  
  Keywords Animals; Perca fluviatilis; Light pollution; Light intensity; Non-invasive hormone measurement; Fish  
  Abstract Flora and fauna evolved under natural day and night cycles. However, natural light is now enhanced by artificial light at night, particularly in urban areas. This alteration of natural light environments during the night is hypothesised to alter biological rhythms in fish, by effecting night-time production of the hormone melatonin. Artificial light at night is also expected to increase the stress level of fish, resulting in higher cortisol production. In laboratory experiments, European perch (Perca fluviatilis) were exposed to four different light intensities during the night, 0 lx (control), 1 lx (potential light level in urban waters), 10 lx (typical street lighting at night) and 100 lx. Melatonin and cortisol concentrations were measured from water samples every 3 h during a 24 hour period. This study revealed that the nocturnal increase in melatonin production was inhibited even at the lowest light level of 1 lx. However, cortisol levels did not differ between control and treatment illumination levels. We conclude that artificial light at night at very low intensities may disturb biological rhythms in fish since nocturnal light levels around 1 lx are already found in urban waters. However, enhanced stress induction could not be demonstrated.  
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  Call Number LoNNe @ schroer @ Serial 1087  
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Author Brüning, A.; Hölker, F.; Franke, S.; Preuer, T.; Kloas, W. url  openurl
  Title Spotlight on fish: Light pollution affects circadian rhythms of European perch but does not cause stress Type Journal Article
  Year 2015 Publication Science of The Total Environment Abbreviated Journal  
  Volume (down) 511 Issue Pages 516-522  
  Keywords animals; fish; Circadian Rhythm; melatonin; cortisol  
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  Notes Approved no  
  Call Number LoNNe @ schroer @ Serial 1580  
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Author Tollefson, J. url  openurl
  Title Energy: Islands of Light Type Journal Article
  Year 2014 Publication Nature Abbreviated Journal  
  Volume (down) 507 Issue 7491 Pages 154-156  
  Keywords Ecology  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ kagoburian @ Serial 825  
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