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Author (up) Bolton, D.; Mayer-Pinto, M.; Clark, G.F.; Dafforn, K.A.; Brassil, W.A.; Becker, A.; Johnston, E.L. url  doi
openurl 
  Title Coastal urban lighting has ecological consequences for multiple trophic levels under the sea Type Journal Article
  Year 2016 Publication The Science of the Total Environment Abbreviated Journal Sci Total Environ  
  Volume 576 Issue Pages 1-9  
  Keywords Animals; Ecology  
  Abstract Urban land and seascapes are increasingly exposed to artificial lighting at night (ALAN), which is a significant source of light pollution. A broad range of ecological effects are associated with ALAN, but the changes to ecological processes remain largely unstudied. Predation is a key ecological process that structures assemblages and responds to natural cycles of light and dark. We investigated the effect of ALAN on fish predatory behaviour, and sessile invertebrate prey assemblages. Over 21days fish and sessile assemblages were exposed to 3 light treatments (Day, Night and ALAN). An array of LED spotlights was installed under a wharf to create the ALAN treatments. We used GoPro cameras to film during the day and ALAN treatments, and a Dual frequency IDentification SONar (DIDSON) to film during the night treatments. Fish were most abundant during unlit nights, but were also relatively sedentary. Predatory behaviour was greatest during the day and under ALAN than at night, suggesting that fish are using structures for non-feeding purposes (e.g. shelter) at night, but artificial light dramatically increases their predatory behaviour. Altered predator behaviour corresponded with structural changes to sessile prey assemblages among the experimental lighting treatments. We demonstrate the direct effects of artificial lighting on fish behaviour and the concomitant indirect effects on sessile assemblage structure. Current and future projected use of artificial lights has the potential to significantly affect predator-prey interactions in marine systems by altering habitat use for both predators and prey. However, developments in lighting technology are a promising avenue for mitigation. This is among the first empirical evidence from the marine system on how ALAN can directly alter predation, a fundamental ecosystem process, and have indirect trophic consequences.  
  Address Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, Australia; Sydney Institute of Marine Sciences, Mosman, NSW 2088, Australia  
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  Language English Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN 0048-9697 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:27780095 Approved no  
  Call Number LoNNe @ kyba @ Serial 1548  
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Author (up) Brüning A., Hölker, F., Franke, S., Preuer, T., Kloas, W. url  doi
openurl 
  Title Impact of different colours of artificial light at night on melatonin rhythm and gene expression of gonadotropins in European perch Type Journal Article
  Year 2016 Publication Science of The Total Environment Abbreviated Journal  
  Volume 543 Issue Pages 214-222  
  Keywords Animals  
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  Notes Approved no  
  Call Number LoNNe @ schroer @ Serial 1294  
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Author (up) 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 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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  Notes Approved no  
  Call Number LoNNe @ schroer @ Serial 1087  
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Author (up) Bruning, A.; Hölker, F.; Franke, S.; Kleiner, W.; Kloas, W. url  doi
openurl 
  Title Impact of different colours of artificial light at night on melatonin rhythm and gene expression of gonadotropins in European perch Type Journal Article
  Year 2015 Publication The Science of the Total Environment Abbreviated Journal Sci Total Environ  
  Volume 543 Issue Pt A Pages 214-222  
  Keywords Animals; Fish; Gonadotropins; Light pollution; Melatonin; Perca fluviatilis; Reproduction; Spectral sensitivity  
  Abstract The distribution and intensity of artificial light at night, commonly referred to as light pollution, is consequently rising and progressively also ecological implications come to light. Low intensity light is known to suppress nocturnal melatonin production in several fish species. This study aims to examine the least suppressive light colour for melatonin excreted into the holding water and the influence of different light qualities and quantities in the night on gene expression of gonadotropins in fish. European perch (Perca fluviatilis) were exposed to light of different wavelengths during the night (blue, green, and red). Melatonin concentrations were measured from water samples every 3h during a 24h period. Gene expression of gonadotropins was measured in perch exposed to different light colours and was additionally examined for perch subjected to different intensities of white light (0lx, 1lx, 10lx, 100lx) during the night. All different light colours caused a significant drop of melatonin concentration; however, blue light was least suppressive. Gene expression of gonadotropins was not influenced by nocturnal light of different light colours, but in female perch gonadotropin expression was significantly reduced by white light already at the lowest level (1lx). We conclude that artificial light with shorter wavelengths at night is less effective in disturbing biological rhythms of perch than longer wavelengths, coinciding with the light situation in freshwater habitats inhabited by perch. Different light colours in the night showed no significant effect on gonadotropin expression, but white light in the night can disturb reproductive traits already at very low light intensities. These findings indicate that light pollution has not only the potential to disturb the melatonin cycle but also the reproductive rhythm and may therefore have implications on whole species communities.  
  Address Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Muggelseedamm 310, 12587, Berlin, Germany. Electronic address: werner.kloas(at)igb-berlin.de  
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  Language English Summary Language Original Title  
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  Series Volume Series Issue Edition  
  ISSN 0048-9697 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:26584071 Approved no  
  Call Number IDA @ john @ Serial 1302  
Permanent link to this record
 

 
Author (up) 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 511 Issue Pages 516-522  
  Keywords animals; fish; Circadian Rhythm; melatonin; cortisol  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number LoNNe @ schroer @ Serial 1580  
Permanent link to this record
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