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Author Shillo, R., & Halevy, A. H.
Title Interaction of photoperiod and temperature in flowering-control of Gypsophila paniculata L Type Journal Article
Year 1982 Publication Scientia Horticulturae Abbreviated Journal
Volume 16 Issue 4 Pages 385-393
Keywords Plants
Abstract Long day promotes flowering of Gysophila paniculata L cultivar ‘Bristol Fairy’. Repeated treatments with GA3 or GA4 + 7 in short days did not promote flowering. The long photoperiod is effective only at relatively high temperatures. At night temperatures below 12°C, the plants remain vegetative even in long days. Efficient artificial lighting is from incandescent lamps at 60–100 lux. Fluorescent lighting (Cool-White) is not effective. Lighting of 4 hours as a night-break or at the end of the night were equally effective, but 4 hours lighting as a day-extension was less effective. Whole-night lighting promoted flowering more than any of the 4-hour lighting regimes. Cyclic lighting of one third light in each cycle promoted flowering to the same extent as continuous lighting. Light intensity during the day has a decisive effect on flower production.
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Call Number IDA @ intern @ Serial 2370
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Author Stone, E.M.; Jones, G.; Harris, S.
Title Conserving energy at a cost to biodiversity? Impacts of LED lighting on bats Type Journal Article
Year 2012 Publication Global Change Biology Abbreviated Journal
Volume 18 Issue 8 Pages 2458–2465
Keywords Animals; anthropogenic impacts; biodiversity conservation; climate change targets; LED street lights; light pollution; light-emitting diodes
Abstract Artificial lighting is a key biodiversity threat and produces 1900 million tonnes of CO 2 emissions globally, more than three times that produced by aviation. The need to meet climate change targets has led to a global increase in energy-efficient light sources such as high-brightness light-emitting diodes (LEDs). Despite the energetic benefits of LEDs, their ecological impacts have not been tested. Using an experimental approach, we show that LED street lights caused a reduction in activity of slow-flying bats ( Rhinolophus hipposideros and Myotis spp.). Both R. hipposideros and Myotis spp. activities were significantly reduced even during low light levels of 3.6 lux. There was no effect of LED lighting on the relatively fast-flying Pipistrellus pipistrellus, Pipistrellus pygmaeus and Nyctalus/Eptesicus spp. We provide the first evidence of the effects of LED lights on bats. Despite having considerable energy-saving benefits, LED lights can potentially fragment commuting routes for bats with associated negative conservation consequences. Our results add to the growing evidence of negative impacts of lighting on a wide range of taxa. We highlight the complexities involved in simultaneously meeting targets for reduction of greenhouse gas emissions and biodiversity loss. New lighting strategies should integrate climate change targets with the cultural, social and ecological impacts of emerging lighting technologies.
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Call Number LoNNe @ christopher.kyba @ Serial 395
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Author Seenappa, S.N.
Title Effect of Photoperiodism on Feeding and Defecation in Compost Earthworm Eudrilus eugeniae Type Journal Article
Year 2012 Publication Universal Journal of Environmental Research and Technology Abbreviated Journal
Volume 2 Issue 1 Pages 21-25
Keywords Animals; Photoperiodic effect; feeding rate; Eudrilus eugeniae; synchronization and re-synchronization
Abstract The effects of different fixed photoperiodic regimes on the rate of feeding and defecation in the epigeic

oligochaete (Eudrilus eugeniae) has been investigated. The different photoperiods stipulated were Natural 12hr

Light: 12hr Dark (natural LD 12:12), Reversal of 12hr Light: 12hr Dark ( reversal LD 12:12), 24hr Light source (L

24), 24hr Dark (D 24) and control set (natural rhythm) were experienced by E. eugeniae in the course of the

study. The experiments were carried out during the ambient winter (26 degree C + 2 ) and all clitellate worms

showed varied feeding and defecation activities. Worms fed actively only during night times under natural LD

12: 12. when exposed to reversal LD 12:12 revealed acclimatization to the changed conditions of day and night

by the end of 2nd week and started feeding voraciously. Worms that were maintained in D 24 showed enhanced

feeding rate with increased biomass over the worms that were maintained in natural LD 12:12 and natural

rhythm (control set). ANOVA and ANCOVA tests applied revealed that the total darkness or diffused light

without any disturbance influenced the feeding rate of worms that in turn showed higher production of

defecation as vermicompost. The critical difference (C.D.) of ANOVA was 0.98(0.05%) and the difference for

testing among treatments in ANCOVA was 781191.15(0.05). Resynchronization pattern were seen when

changed to reversal LD 12:12 from natural LD 12:12. Observations revealed that worms were confused from day

1-4 when any changed photoperiodic devices were fixed other than their regular normal pattern of Light and

Dark cycle and later got acclimatization into the induced photoperiodic cycles. The study apart from proving the

exogenous factors on the photoperiodic effects also proven the importance of darkness to the worms in

defecation that has importance in the conversion of given substrate at a faster pase.
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Call Number LoNNe @ christopher.kyba @ Serial 396
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Author Kulczykowska, E.; Popek, W.; Kapoor. B.G.; editors
Title Biological Clock in Fish. Type Journal Article
Year 2010 Publication CRC Press Abbreviated Journal
Volume Issue Pages
Keywords Animals
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Call Number LoNNe @ christopher.kyba @ Serial 398
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Author Leopold, M.F.; Philippart, C.J.M.; Yorio, P.
Title Nocturnal feeding under artificial light conditions by Brown-Hooded Gull (Larus Maculipennis) in Puerto Madryn harbour (Chubut province, Argentina) Type Journal Article
Year 2010 Publication El hornero Abbreviated Journal
Volume 25 Issue 2 Pages 55-60
Keywords Animals; Diet; Marine invertebrates; Night light niche; Patagonia; Seabirds.
Abstract This paper describes nocturnal, marine feeding behaviour in the Brown-hooded Gull (Larus maculipennis) in November 2009. The gulls assembled at night at the end of a long pier, running 800 m offshore into the Golfo Nuevo, at Puerto Madryn, Chubut Province, Argentina. Powerful lights predictably lighted the water around the end of the pier and attracted many small prey animals to the surface. Several hundreds of gulls, presumed to be local breeders, came every night to feed on this bounty, using various feeding techniques and taking several prey species and sizes. Potential prey items were caught to be identified by vertical plankton hauls. The gulls most likely took relatively large Isopoda (Idothea sp.), Polychaeta (Platynereis sp.) and fish larvae (Patagonotothen sp.) as well as smaller crustaceans, mostly Amphipoda (Phoxocephalidae) and Mysidacea. The gulls caught small prey items while swimming, by rapid surface pecking, while they hunted the larger prey species by flying low over the water and performing shallow, vertical plunge-dives. During daylight, only few gulls ventured from land into the bay, indicating that they took advantage of the nocturnal feeding opportunity, facilitated by artificial lighting. The clear short-term gain of exploiting this novel foraging opportunity may be offset by potential threats such as increased vulnerability to predators or contamination by oil spills from ships moored along the pier.
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Call Number LoNNe @ christopher.kyba @ Serial 399
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