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Author Rodríguez, A.; Moffett, J.; Revoltós, A.; Wasiak, P.; McIntosh, R.R.; Sutherland, D.R.; Renwick, L.; Dann, P.; Chiaradia, A.
Title Light pollution and seabird fledglings: Targeting efforts in rescue programs: Assessing Condition Of Rescued Seabirds Type Journal Article
Year 2017 Publication (down) The Journal of Wildlife Management Abbreviated Journal Jour. Wild. Mgmt.
Volume 81 Issue 4 Pages 734-741
Keywords Animals
Abstract One of the most critical phases in the life of petrels (Procellariiformes) is at fledging whenyoung birds pass from parental dependence on land to an independent life at sea. To mitigate mortality at thistime, rescue programs are implemented near breeding sites around the world, especially for birds grounded byartificial lights. We evaluated the plumage and body condition of short-tailed shearwater (Ardennatenuirostris) fledglings captured at colonies just before departure in comparison to fledglings washed up onbeaches and to fledglings attracted by artificial light along roads. We measured abundance of down, bodymass, and body condition index as the standardized residuals of a regression of body mass on size, andemployed linear models to test differences on body mass and body condition between locations. Beach-washed birds were underweight and in poor condition, suggesting their future survival probabilities at seawere low. Birds rescued on roads as a consequence of light attraction had lower body weights and conditionindices than fledglings captured at the colony. However, more than 50% of light-attracted birds had attainedsimilar weights to those of adults, suggesting they have higher probabilities of survival than beach-washedbirds. Water-logged birds being washed onto beaches is a natural process, but birds grounded by lightingalong roads is an increasing anthropogenic threat that requires management. Thus, management andconservation efforts should be directed to protect birds in the colonies and reduce light-induced mortality,ideally through the strategic reduction of light sources and lateral light spillage. When resources forconservation are limited, rescue programs should focus on rescuing birds from roads rather than beach-washed birds, which have a lower probability of survival.
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ISSN 0022541X ISBN Medium
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Notes Approved no
Call Number GFZ @ kyba @ Serial 2445
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Author Birriel, J. J.; Adkins, J. K.
Title Sky Brightness at Zenith During the January 2019 Total Lunar Eclipse Type Journal Article
Year 2019 Publication (down) The Journal of the American Association of Variable Star Observers Abbreviated Journal
Volume 47 Issue 1 Pages 94
Keywords Skyglow
Abstract Lunar eclipses occur during the full moon phase when the moon is obscured by Earth's shadow. During these events, the night sky brightness changes as the full moon rises and then passes first into the penumbral and then the umbral shadow. We acquired sky brightness data at zenith using a Unihedron Sky Quality Meter during the 20-21 January 2019 total lunar eclipse as seen from Morehead, Kentucky. The resulting sky brightness curve shows an obvious signature when the moon enters the umbral (partial) eclipse phases and the total eclipse phase. During the total eclipse phase, the brightness curve is flat and measures 19.1 ± 0.1 mag / arcsec2. The observed brightness at totality is close to typical new moon in January night at our location, which measures 19.3 ± 0.1 mag / arcsec2. The partial eclipse phase is symmetric on either side of totality. The penumbral phase is more difficult to identify in the plot, without comparison to a typical full moon night. There is a clear asymmetry in the curve just before and just after the umbral phase. This asymmetry is probably due to changes in terrestrial atmospheric conditions, such as high altitude clouds.
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Call Number IDA @ intern @ Serial 2647
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Author Watson, L.A.; Phillips, A.J.K.; Hosken, I.T.; McGlashan, E.M.; Anderson, C.; Lack, L.C.; Lockley, S.W.; Rajaratnam, S.M.W.; Cain, S.W.
Title Increased sensitivity of the circadian system to light in delayed sleep-wake phase disorder Type Journal Article
Year 2018 Publication (down) The Journal of Physiology Abbreviated Journal J Physiol
Volume in press Issue Pages
Keywords Human Health
Abstract KEY POINTS: This is the first study to demonstrate an altered circadian phase shifting response in a circadian rhythm sleep disorder. Patients with Delayed Sleep-Wake Phase Disorder (DSWPD) demonstrate greater sensitivity of the circadian system to the phase delaying effects of light. Increased circadian sensitivity to light is associated with later circadian timing within both control and DSWPD groups. DSWPD patients had a greater sustained pupil response after light exposure. Treatments for DSWPD should consider sensitivity of the circadian system to light as a potential underlying vulnerability, making patients susceptible to relapse. ABSTRACT: Patients with Delayed Sleep-Wake Phase Disorder (DSWPD) exhibit delayed sleep-wake behavior relative to desired bedtime, often leading to chronic sleep restriction and daytime dysfunction. The majority of DSWPD patients also display delayed circadian timing in the melatonin rhythm. Hypersensitivity of the circadian system to phase delaying light is a plausible physiological basis for DSWPD vulnerability. We compared the phase shifting response to a 6.5-h light exposure ( approximately 150 lux) between male patients with diagnosed DSWPD (n = 10; aged 22.4 +/- 3.3 years) and male healthy controls (n = 11; aged 22.4 +/- 2.4 years). Salivary dim light melatonin onset (DLMO) was measured under controlled conditions in dim light (<3 lux) before and after light exposure. Correcting for the circadian time of the light exposure, DSWPD patients exhibited 31.5% greater phase delay shifts than healthy controls. In both groups, a later initial phase of the melatonin rhythm was associated with greater magnitude of phase shifts, indicating that increased circadian sensitivity to light may be a factor that contributes to delayed phase, even in non-clinical groups. DSWPD patients also had reduced pupil size following the light exposure, and showed a trend towards increased melatonin suppression during light exposure. These findings indicate that, for patients with DSWPD, assessment of light sensitivity may be an important factor that can inform behavioral therapy, including minimization of exposure to phase-delaying night-time light. This article is protected by copyright. All rights reserved.
Address Monash Institute of Cognitive and Clinical Neurosciences, School of Psychological Sciences, Monash University, Melbourne, Victoria, Australia
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0022-3751 ISBN Medium
Area Expedition Conference
Notes PMID:30281150 Approved no
Call Number GFZ @ kyba @ Serial 2026
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Author Youngstedt, S.D.; Elliott, J.A.; Kripke, D.F.
Title Human Circadian Phase-Response Curves for Exercise Type Journal Article
Year 2019 Publication (down) The Journal of Physiology Abbreviated Journal J Physiol
Volume 597 Issue 8 Pages 2253-2268
Keywords Human Health; Circadian Rhythm; Exercise
Abstract KEY POINTS: Exercise elicits circadian phase-shifting effects, but additional information is needed. The phase-response curve describing the magnitude and direction of circadian rhythm phase shifts depending on the time of the zeigeber (time cue) stimulus is the most fundamental chronobiological tool for alleviating circadian misalignment and related morbidity. 51 older and 48 young adults followed a circadian rhythms measurement protocol for up to 5.5 days, and performed 1 h of moderate treadmill exercise for 3 consecutive days at one of 8 times of day/night. Temporal changes in the phase of 6-sulphatoxymelatonin (aMT6s) were measured from evening onset, cosine acrophase, morning offset, and duration of excretion, establishing significant PRCs for aMT6 onset and acrophase with large phase delays from 7-10 PM and large phase advances at both 7 AM and 1-4 PM. Along with known synergism with bright light, the above PRCs with a second phase advance region (afternoon) could support both practical and clinical applications. ABSTRACT: Although bright light is regarded as the primary circadian zeitgeber, its limitations support exploring alternative zeitgebers. Exercise elicits significant circadian phase-shifting effects, but fundamental information regarding these effects is needed. The primary aim of this study was to establish phase-response curves (PRC) documenting the size and direction of phase shifts in relation to the circadian time of exercise. Aerobically fit older (n = 51, 59-75 y) and young adults (n = 48, 18-30 y) followed a 90-min laboratory ultra-short sleep wake cycle (60 min wake/30 min sleep) for up to 5 (1/2) days. At the same clock time on three consecutive days, each participant performed 60 min of moderate treadmill exercise (65-75% of heart rate reserve) at one of 8 times of day/night. To describe PRCs, phase shifts were measured for the cosine-fitted acrophase of urinary 6-sulphatoxymelatonin (aMT6s), as well as for the evening rise, morning decline, and change in duration of aMT6s excretion. Significant PRCs were found for aMT6s acrophase, onset and duration, with peak phase advances corresponding to clock times of 7 AM and 1PM-4PM, delays from 7 PM-10 PM, and minimal shifts around 4 PM and 2 AM. There were no significant age or sex differences. The amplitudes of the aMT6s onset and acrophase PRCs are comparable to expectations for bright light of equal duration. The phase advance to afternoon exercise and the exercise-induced PRC for change in aMT6s duration are novel findings. The results support further research exploring additive phase shifting effects of bright light and exercise and health benefits. This article is protected by copyright. All rights reserved.
Address Department of Psychiatry, University of California, San Diego, CA
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0022-3751 ISBN Medium
Area Expedition Conference
Notes PMID:30784068 Approved no
Call Number GFZ @ kyba @ Serial 2230
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Author Clark, N.A.
Title The Rate of Reproduction of Lemna Major as a Function of Intensity and Duration of Light Type Journal Article
Year 1924 Publication (down) The Journal of Physical Chemistry Abbreviated Journal J. Phys. Chem.
Volume 29 Issue 8 Pages 935-941
Keywords Plants
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Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0092-7325 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2374
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