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Author Atasever, M.; Bozkurt, Y.
Title Effect of Different Photoperiod Regimes on Sperm Quality, Fecundity and Fertilization in Rainbow Trout (Oncorhynchus mykiss) Type Journal Article
Year 2015 Publication Turkish Journal of Fisheries and Aquatic Sciences Abbreviated Journal Turk. J. Fish. Aquat. Sci.
Volume 15 Issue Pages 517-523
Keywords animals, fish, photoperiod, sperm, ovulation, fertilization, Oncorhynchus mykiss
Abstract The present study was carried out to determine effect of different photoperiod regimes on sperm quality parameters,

ovulation/spermiation time and hatchery performance of rainbow trout (Oncorhynchus mykiss) broodstock. The designation

was done as combination of different long and short photoperiod regimes such as: 18L:6D and 18D:6L (group I); 14L:10D

and 14D:10L (group II) and natural lighting (control group). All treatments were carried out as three replications at each

group.

As a result, the highest mean spermatozoa motility (83.0±2.1 %) and motility period (67.2±6.3 s) were determined in

control group. It was determined that the longest ovulation was occured in female rainbow trout broodstock at 265 days in

group I. Although the highest mean absolute egg productivity was determined as 3654.7±298.3 eggs/fish in group I, the

highest mean relative egg productivity was determined as 137.3±24.5 eggs/kg in control group. Furthermore, the highest mean

egg diameter (4.6±0.1 mm) and fertilization rate (87.0±2.5 %) were determined in control group. Statistical analyses revealed

that spermatozoa motility, spermatozoa motility period and spermatozoa density positively correlated with fertilization rate in

all photoperiod regimes (P>0.05). On the other hand, semen volume and semen pH negatively correlated with fertilization rate

in all photoperiod regimes (P>0.05). It is interesting to note that only statistically important positive correlation was

determined between relative fecundity and fertilization rate in 18L:6D/18D:6L photoperiod regime (r=0.452, P<0.05).

Consequently, results revealed that combined long and short artificial photoperiod regimes can advance ovulation and

spermiation and also can effect gamete quality and hatchery performance of rainbow trout during out-of-season spawning.
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Call Number (down) LoNNe @ schroer @ Serial 1570
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Author Schroer, S.; Hölker F.; Corcho, O.
Title The impact of citizen science on research about artificial light at night Type Journal Article
Year 2016 Publication Environmental Scientist Abbreviated Journal
Volume 25 Issue 2 Pages 18-24
Keywords citizen science; light pollution research
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Publisher Place of Publication Editor
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Notes Approved no
Call Number (down) LoNNe @ schroer @ Serial 1571
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Author Schroer, S.; Felsmann, K.; Hölker, F.; Mummert, S.; Monaghan, M.T.; Wurzbacher, C.; Premke, K.
Title The impact of outdoor lighting on ecosystem function – gaining information with a Citizen Science approach using a questionnaire Type Conference Article
Year 2016 Publication Austrian Citizen Science Conference Abbreviated Journal
Volume Issue Pages 8-13
Keywords citizen science; mapping
Abstract
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Corporate Author Thesis
Publisher Frontiers Place of Publication Editor
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Notes Approved no
Call Number (down) LoNNe @ schroer @ Serial 1572
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Author Hölker, Andreas; Doulos, Lambros; Schroer, Sibylle; Topalis, Frangiskos
Title Sustainable outdoor lighting for reducing energy and light waste Type Conference Article
Year 2016 Publication 9th International Conference Improving Energy Efficiency in Commercial Buildings and Smart Communities Abbreviated Journal
Volume Issue Pages 202-213
Keywords lighting design; lighting technology; light pollution
Abstract The lack of lighting planning for internal and external illumination of buildings contributes to wasting energy and to the issue of light pollution. This will be demonstrated with research from the ground and by analysis of images, taken with detectors on satellites, the International Space Station or planes. Besides large area floodlighting from airports or sports facilities, facade illumination is the most important contributor. The effects of malpractice versus sustainable lighting planning solutions will be demonstrated with some examples in cities like Bonn, Strasbourg, Athens and Thessaloniki. Further examples in the countryside will demonstrate lighting practice in the German star park Biosphere Reserve Rhön. Facade lighting planning, considering optimal alignment, the intensity and the colour quality of the illumination, will contribute to reducing light pollution and thus waste of energy and will increase human comfort at the same time.

Experience shows that unilateral promoting energy efficiency will finally result in more extended use of energy, which is known as rebound effect. In addition the small size and long lifetime of the modern solid state lighting will result in an increased use even in remote places thereby emitting more artificial light into the natural night. This does not only affect the energy use, but also the biological rhythms of animals and human beings.

More interdisciplinary criteria for a sustainable lighting with reduced light pollution will be discussed based on the observations including data provided by the EU-network “Loss of the Night”-Network (EU-COST Action ES1204 LoNNe).
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Publisher JRC Confernce and workshop reports Place of Publication Editor
Language Summary Language Original Title
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Notes Approved no
Call Number (down) LoNNe @ schroer @ Serial 1573
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Author Aubrecht, T.; Weil, Z.; Nelson, R.
Title Dim light at night interferes with the development of the short-day phenotype and impairs cell-mediated immunity in Siberian hamsters (Phodopus sungorus) Type Journal Article
Year 2014 Publication Journal of Experimental Zoology Abbreviated Journal J. Exp. Zool.
Volume 321 Issue 8 Pages 450-456
Keywords animals; seasonal timing; chronobiological effects
Abstract Winter is a challenging time to survive and breed outside of the tropics. Animals use day length (photoperiod) to regulate seasonally appropriate adaptations in anticipation of challenging winter conditions. The net result of these photoperiod-mediated adjustments is enhanced immune function and increased survival. Thus, the ability to discriminate day length information is critical for survival and reproduction in small animals. However, during the past century, urban and suburban development has rapidly expanded and filled the night sky with light from various sources, obscuring crucial light-dark signals, which alters physiological interpretation of day lengths. Furthermore, reduced space, increased proximity to people, and the presence of light at night may act as stressors for small animals. Whereas acute stressors typically enhance immune responses, chronic exposure to stressors often impairs immune responses. Therefore, we hypothesized that the combination of dim light at night and chronic stress interferes with enhanced cell-mediated immunity observed during short days. Siberian hamsters (Phodopus sungorus) were assigned to short or long days with dark nights (0&#8201;lux) or dim (5&#8201;lux) light at night for 10 weeks. Following 2 weeks of chronic restraint (6&#8201;hr/day), a model of chronic stress, delayed type hypersensitivity (DTH) responses were assessed. Both dim light at night and restraint reduced the DTH response. Dim light at night during long nights produced an intermediate short day phenotype. These results suggest the constant presence of light at night could negatively affect survival of photoperiodic rodents by disrupting the timing of breeding and immune responses.
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Notes Approved no
Call Number (down) LoNNe @ schroer @ Serial 1574
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