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Arnott, J. T. |
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Title |
Growth Response of White and Englemann Spruce Seedlings to Extended Photoperiod Using Three Light Intensities |
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1982 |
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Technical Report: Pacific Forestry Centre |
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Plants |
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Four seedlots of white spruce (Picea glauca (Moench) Voss) and three of Engelmann spruce (Picea engelmannii Parry), covering a range of 10 degrees of latitude and a range of altitudes, were sown in BC/ CFS Styroblocks and grown in a heated greenhouse and an unheated shadehouse, using incandescent light to provide a 19-h photoperiod. Four intensities of lighting were used: 0, 100,200, and 400 Ix. A second experiment with the same seedlots was conducted in growth rooms that were programmed to evaluate the effect of low night temperature on seedling shoot growth when the photoperiod was extended to 19 h, using a light intensity of 200 Ix.
Shoot length of white and Engelmann spruce seedlings grown under an extended daylength of 100 Ix were significantly taller than the control (0 Ix). There were no significant differences in shoot length or weight among the three intensities of light used to extend the photoperiod for all seedlots except the southern latitude-low elevation population of Engelmann spruce. The more northern populations of white spruce and the high altitude populations of Engelmann spruce did not require light intensities higher than 100 Ix to maintain apical growth. Low night temperature (7°C) did produce significantly smaller seedlings than the warm night (1SoC) regime. However, terminal resting buds of seedlings grown under the cool night regime did not form any sooner than on those seedlings grown under warm nights. |
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IDA @ intern @ |
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2372 |
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Author |
Aschoff, J. |
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Title |
Aktivitätsmuster der Tagesperiodik |
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Journal Article |
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1957 |
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Die Naturwissenschaften |
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44 |
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13 |
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361-367 |
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Human Health |
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LoNNe @ kagoburian @ |
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709 |
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Ashford, O.M. |
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A portable cloud searchlight |
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1947 |
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Weather |
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2 |
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103-104 |
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Remote Sensing |
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GFZ @ kyba @ |
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2044 |
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Atchoi, E.; Mitkus, M.; Rodríguez, A. |
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Title |
Is seabird light‐induced mortality explained by the visual system development? |
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2020 |
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Conservation Science and Practice |
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Conservat Sci and Prac |
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in press |
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Seabirds are impacted by coastal light pollution, leading to massive mortality events. Juveniles comprise the majority of affected individuals, while adults are only seldom grounded and reported in rescue programs. We propose a connection between visual system development of burrow nesting seabirds and the observed higher vulnerability to light pollution by a specific age group. We illustrate the need for multidisciplinary research to better understand and further mitigate light-induced mortality. |
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2578-4854 |
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GFZ @ kyba @ |
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2845 |
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Author |
Aubé, M. |
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Title |
Physical behaviour of anthropogenic light propagation into the nocturnal environment |
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2015 |
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Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences |
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Philos Trans R Soc Lond B Biol Sci |
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370 |
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20140117 |
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Skyglow; artificial light at night; light pollution; radiative transfer; atmospheric effects; scattering; methods; numerical; sensitivity analysis |
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Propagation of artificial light at night (ALAN) in the environment is now known to have non negligible consequences on fauna, flora and human health. These consequences depend on light levels and their spectral power distributions, which in turn rely on the efficiency of various physical processes involved in the radiative transfer of this light into the atmosphere and its interactions with the built and natural environment. ALAN can affect the living organisms by direct lighting and indirect lighting (scattered by the sky and clouds and/or reflected by local surfaces). This paper mainly focuses on the behaviour of the indirect light scattered under clear sky conditions. Various interaction processes between anthropogenic light sources and the natural environment are discussed. This work mostly relies on a sensitivity analysis conducted with the light pollution radiative transfer model, Illumina (Aubé et al. 2005: Light pollution modelling and detection in a heterogeneous environment: toward a night-time aerosol optical depth retrieval method. In Proc. SPIE 2005, vol. 5890, San Diego, California, USA). More specifically, the impact of (i) the molecular and aerosol scattering and absorption, (ii) the second order of scattering, (iii) the topography and obstacle blocking, (iv) the ground reflectance and (v) the spectrum of light devices and their angular emission functions are examined. This analysis considers different behaviour as a function of the distance from the city centre, along with different zenith viewing angles in the principal plane. |
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Département de physique, Cégep de Sherbrooke, Sherbrooke, Quebec, Canada |
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Royal Society |
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English |
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The biological impacts of artificial light at night: from molecules to communities |
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IDA @ john @ |
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1115 |
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