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Author Dominoni, D.M.; Carmona-Wagner, E.O.; Hofmann, M.; Kranstauber, B.; Partecke, J.
Title Individual-based measurements of light intensity provide new insights into the effects of artificial light at night on daily rhythms of urban-dwelling songbirds Type Journal Article
Year 2014 Publication Journal of Animal Ecology Abbreviated Journal J Anim Ecol
Volume 83 Issue 3 Pages 681–692
Keywords Animals; Biological rhythms; light at night; light loggers; light pollution; night shift; noise; radiotelemetry; sleep disruption; temporal niche; urban sprawl
Abstract Summary

The growing interest in the effects of light pollution on daily and seasonal cycles of animals has led to a boost of research in recent years. In birds, it has been hypothesized that artificial light at night can affect daily aspects of behaviour, but one caveat is the lack of knowledge about the light intensity that wild animals, such as birds, are exposed to during the night.

Organisms have naturally evolved daily rhythms to adapt to the 24-h cycle of day and night, thus, it is important to investigate the potential shifts in daily cycles due to global anthropogenic processes such as urbanization.

We captured adult male European blackbirds (Turdus merula) in one rural forest and two urban sites differing in the degree of anthropogenic disturbance. We tagged these birds with light loggers and simultaneously recorded changes in activity status (active/non-active) through an automated telemetry system. We first analysed the relationship between light at night, weather conditions and date with daily activity onset and end. We then compared activity, light at night exposure and noise levels between weekdays and weekends.

Onset of daily activity was significantly advanced in both urban sites compared to the rural population, while end of daily activity did not vary either among sites. Birds exposed to higher amounts of light in the late night showed earlier onset of activity in the morning, but light at night did not influence end of daily activity. Light exposure at night and onset/end of daily activity timing was not different between weekdays and weekends, but all noise variables were. A strong seasonal effect was detected in both urban and rural populations, such as birds tended to be active earlier in the morning and later in the evening (relative to civil twilight) in the early breeding season than at later stages.

Our results point at artificial light at night as a major driver of change in timing of daily activity. Future research should focus on the costs and benefits of altered daily rhythmicity in birds thriving in urban areas.
Address Department of Migration and Immuno-ecology, Max Planck Institute for Ornithology, Am Obstberg 1, 78315, Radolfzell, Germany; Department of Biology, University of Konstanz, Universitatsstrasse 10, 78464, Konstanz, Germany
Corporate Author Thesis
Publisher Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0021-8790 ISBN Medium
Area (up) Expedition Conference
Notes PMID:24102250 Approved no
Call Number LoNNe @ christopher.kyba @ Serial 375
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Author Blagonravov, M.L.; Bryk, A.A.; Medvedeva, E.V.; Goryachev, V.A.; Chibisov, S.M.; Kurlaeva, A.O.; Agafonov, E.D.
Title Structure of Rhythms of Blood Pressure, Heart Rate, Excretion of Electrolytes, and Secretion of Melatonin in Normotensive and Spontaneously Hypertensive Rats Maintained under Conditions of Prolonged Daylight Duration Type Journal Article
Year 2019 Publication Bulletin of Experimental Biology and Medicine Abbreviated Journal Bull Exp Biol Med
Volume 168 Issue 1 Pages 18-23
Keywords Animals; arterial hypertension; biological rhythms; excessive exposure to light; melatonin
Abstract We studied the structure of rhythms of BP, HR (by telemetric monitoring), electrolyte excretion (by capillary electrophoresis), and products of epiphyseal melatonin (by the urinary concentration of 6-sulfatoxymelatonin measured by ELISA) in normotensive Wistar-Kyoto rats and spontaneously hypertensive SHR rats maintained at 16/8 h and 20/4 h light-dark regimes. In Wister-Kyoto rats exposed to prolonged daylight, we observed changes in the amplitude, rhythm power (% of rhythm), and range of oscillations of systolic BP; HR mezor decreased. In SHR rats, mezor of HR also decreased, but other parameters of rhythms remained unchanged. Changes in electrolyte excretion were opposite in normo- and hypertensive rats. Under conditions of 20/4 h light-dark regime, daytime melatonin production tended to increase in normotensive rats and significantly increased in SHR rats. At the same time, nighttime melatonin production did not change in both normotensive and hypertensive animals. As the secretion of melatonin has similar features in animals of both lines, we can say that the epiphyseal component of the “biological clock” is not the only component of the functional system that determines the response of the studied rhythms to an increase in the duration of light exposure.
Address V. A. Frolov Department of General Pathology and Pathophysiology, Institute for Medicine, Peoples' Friendship University of Russia, Moscow, Russia
Corporate Author Thesis
Publisher Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0007-4888 ISBN Medium
Area (up) Expedition Conference
Notes PMID:31741240 Approved no
Call Number GFZ @ kyba @ Serial 2755
Permanent link to this record