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Author Cui, Y.; Zhao, J.Y.; Chu, J.K.; Guan, L.; Zhang, R.
Title A Study on Polarization Pattern of Full Moonlight Based on the Neutral Points and the Meridian Type Journal Article
Year 2017 Publication Applied Mechanics and Materials Abbreviated Journal Amm
Volume (down) 868 Issue Pages 350-356
Keywords moonlight
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ISSN 1662-7482 ISBN Medium
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Notes Approved no
Call Number LoNNe @ kyba @ Serial 1694
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Author Langbehn, T.; Aksnes, D.; Kaartvedt, S.; Fiksen, Ø.; Jørgensen, C.
Title Light comfort zone in a mesopelagic fish emerges from adaptive behaviour along a latitudinal gradient Type Journal Article
Year 2019 Publication Marine Ecology Progress Series Abbreviated Journal Mar. Ecol. Prog. Ser.
Volume (down) 623 Issue Pages 161-174
Keywords Animals; Moonlight
Abstract Throughout the oceans, small fish and other micronekton migrate between daytimedepths of several hundred meters and near-surface waters at night. These diel vertical migrationsof mesopelagic organisms structure pelagic ecosystems through trophic interactions, and are akey element in the biological carbon pump. However, depth distributions and migration ampli-tude vary greatly. Suggested proximate causes of the migration such as oxygen, temperature, andlight often correlate and therefore the causal underpinnings have remained unclear. Using meso-pelagic fishes and the Norwegian Sea as a study system, we developed a dynamic state variablemodel that finds optimal migration patterns that we validate with acoustic observations along alatitudinal gradient. The model describes predation risk and bioenergetics, and maximizes ex -pected energy surplus, a proxy for Darwinian fitness. The model allows us to disentangle the driv-ers of migration and make predictions about depth distribution and related fitness consequencesalong a latitudinal trajectory with strong gradients in environmental drivers and vertical distribu-tion of scattering layers. We show that the model-predicted vertical migration of mesopelagicfishes matches that observed along this transect. For most situations, modelled mesopelagic fishbehaviour can be well described by a light comfort zone near identical to that derived from obser-vations. By selectively keeping light or temperature constant, the model reveals that temperature,in comparison with light, has little effect on depth distribution. We find that water clarity, whichlimits how deeply light can penetrate into the ocean, structures daytime depths, while surfacelight at night controlled the depth of nocturnal ascents.
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ISSN 0171-8630 ISBN Medium
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Notes Approved no
Call Number GFZ @ kyba @ Serial 2598
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Author Jones, A.; Noll, S.; Kausch, W.; Szyszka, C.; Kimeswenger, S.
Title An advanced scattered moonlight model for Cerro Paranal Type Journal Article
Year 2013 Publication Astronomy & Astrophysics Abbreviated Journal A&A
Volume (down) 560 Issue Pages A91
Keywords Moonlight
Abstract The largest natural source of light at night is the Moon, and it is the major contributor to the astronomical sky background. Being able to accurately predict the sky background, including scattered moonlight is important for scheduling astronomical observations. We have developed an improved scattered moonlight model, in which the components are computed with a better physical understanding as opposed to the simple empirical fit in the frequently used photometric model of Krisciunas & Schaefer (1991, PASP, 103, 1033). Our spectroscopic model can better trace the spectral trends of scattered moonlight for any position of the Moon and target observation. This is the first scattered moonlight model that we know of which is this physical and versatile. We have incorporated an observed solar spectrum, accurate lunar albedo fit, and elaborate scattering and absorption calculations that include scattering off of molecules and aerosols. It was designed for Cerro Paranal, but can be modified for any location with known atmospheric properties. Throughout the optical range, the uncertainty is less than 20%. This advanced scattered moonlight model can predict the amount of scattered moonlight for any given geometry of the Moon and target, and lunar phase for the entire optical spectrum.
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ISSN 0004-6361 ISBN Medium
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Notes Approved no
Call Number LoNNe @ kyba @ Serial 1461
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Author Traill, L.W.; Martin, J.; Owen-Smith, N.
Title Lion proximity, not moon phase, affects the nocturnal movement behaviour of zebra and wildebeest Type Journal Article
Year 2016 Publication Journal of Zoology Abbreviated Journal J Zool
Volume (down) 299 Issue 3 Pages 221-227
Keywords Animals; Moonlight
Abstract Moon phase affects nocturnal activity patterns in mammals. Among ungulates, a number of studies have found animals to be more active over full moon nights. This may be because increased luminosity provides increased opportunity to forage and/or increased ability to detect predators; known as the visual acuity hypothesis. Here, we use GPS-derived movement data to test for the influence of moon phase on plains zebra Equus quagga and blue wildebeest Connochaetes taurinus activity in Kruger National Park, South Africa. We compare animal movement (rate and displacement) over full and new moon nights, and consider the effect of lion proximity. We found that lion proximity largely determined the nocturnal movements of zebra and wildebeest, not moon phase. When lions were >1 km away, there was no difference in the nocturnal movement activity of prey animals over full and new moon conditions, contradicting previous findings. When lions were within 1 km of these animals, however, the movement of zebra and wildebeest greatly increased over the new moon, the relatively dark period when lion were most likely hunting. Although we could not explicitly test for predator detection here, our findings suggest that the visual acuity hypothesis does not hold for zebra and wildebeest in Kruger National Park (KNP) given that there is no evidence for increased foraging activity over the full moon. The influence of moon phase on the nocturnal activity of African ungulates may be more complicated than anticipated, and we suggest that this cannot be estimated unless predator proximity is accounted for.
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ISSN 0952-8369 ISBN Medium
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Notes Approved no
Call Number LoNNe @ kyba @ Serial 1558
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Author Luecke, C.; Wurtsbaugh, W.A.
Title Effects of Moonlight and Daylight on Hydroacoustic Estimates of Pelagic Fish Abundance Type Journal Article
Year 1993 Publication Transactions of the American Fisheries Society Abbreviated Journal Transactions of the American Fisheries Society
Volume (down) 122 Issue 1 Pages 112-120
Keywords animals; moonlight
Abstract To determine how moonlight and daylight affect hydroacoustic estimates of fish abundance, we used a dual-beam transducer and echo integration to survey pelagic fish (primarily Bonneville ciscoes Prosopium gemmifer) in Bear Lake, Utah and Idaho. During the new moon, the fish were dispersed (not schooling) below the thermocline, chiefly at the depths of 10–20 m. At full moon, they were dispersed but much closer to the bottom, where they were difficult to detect. Acoustic estimates offish density and biomass during full moons were approximately 50% of values derived during new moons. A diel survey during a new moon indicated that fish were widely dispersed in the water column at night, but formed schools at dawn. Our study indicated that light conditions must be standardized to insure consistent and comparable population estimates of some pelagic fishes.
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ISSN 0002-8487 ISBN Medium
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Notes Approved no
Call Number LoNNe @ kyba @ Serial 1563
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