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Author Molcan, L.; Sutovska, H.; Okuliarova, M.; Senko, T.; Krskova, L.; Zeman, M.
Title Dim light at night attenuates circadian rhythms in the cardiovascular system and suppresses melatonin in rats Type Journal Article
Year 2019 Publication Life Sciences Abbreviated Journal Life Sci
Volume 231 Issue Pages 116568
Keywords (up) Animals
Abstract AIMS: Cardiovascular parameters exhibit significant 24-h variability, which is coordinated by the suprachiasmatic nucleus (SCN), and light/dark cycles control SCN activity. We aimed to study the effects of light at night (ALAN; 1-2lx) on cardiovascular system control in normotensive rats. MAIN METHODS: Heart rate (HR) and blood pressure (BP) were measured by telemetry during five weeks of ALAN exposure. From beat-to-beat telemetry data, we evaluated spontaneous baroreflex sensitivity (sBRS). After 2 (A2) and 5 (A5) weeks of ALAN, plasma melatonin concentrations and the response of BP and HR to norepinephrine administration were measured. The expression of endothelial nitric oxide synthase (eNOS) and endothelin-1 was determined in the aorta. Spontaneous exploratory behaviour was evaluated in an open-field test. KEY FINDINGS: ALAN significantly suppressed the 24-h variability in the HR, BP, and sBRS after A2, although the parameters were partially restored after A5. The daily variability in the BP response to norepinephrine was reduced after A2 and restored after A5. ALAN increased the BP response to norepinephrine compared to the control after A5. Increased eNOS expression was found in arteries after A2 but not A5. Endothelin-1 expression was not affected by ALAN. Plasma melatonin levels were suppressed after A2 and A5. Spontaneous exploratory behaviour was reduced. SIGNIFICANCE: ALAN decreased plasma melatonin and the 24-h variability in the haemodynamic parameters and increased the BP response to norepinephrine. A low intensity ALAN can suppress circadian control of the cardiovascular system with negative consequences on the anticipation of a load.
Address Department of Animal Physiology and Ethology, Faculty of Natural Sciences, Comenius University, Bratislava, Slovakia
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ISSN 0024-3205 ISBN Medium
Area Expedition Conference
Notes PMID:31202842 Approved no
Call Number GFZ @ kyba @ Serial 2548
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Author Marín-Gómez, O.H, & MacGregor-Fors, I.
Title How Early Do Birds Start Chirping? Dawn Chorus Onset and Peak Times in a Neotropical City Type Journal Article
Year 2019 Publication Ardeola Abbreviated Journal
Volume 66 Issue 2 Pages 327-341
Keywords (up) Animals
Abstract Urbanisation poses important challenges for animal communication. Avian dawn choruses are a prominent component of urban soundscapes and have received attention in recent urban ecology studies. Current evidence based on comparisons of urban and non-urban sites suggest that urbanisation is associated with earlier dawn chorus singing activity. However, this phenomenon remains mainly unexplored in tropical cities. We here assessed dawn chorus onset and peak times in two contrasting conditions of the urbanisation intensity gradient (i.e., intra-urban and peri-urban forested areas) of a Neotropical city, Xalapa in Mexico, assessing relationships with noise at sunrise and artificial light at night. We found no differences in dawn chorus onset or singing peak times when contrasting intra- and peri-urban areas. However, we found non-significant trends for earlier chorus onsets and peak times with increasing noise levels. Our results show no relationship between artificial light at night and dawn chorus timing, adding evidence to recent studies showing that light pollution does not seem to be determinant in the dawn choruses of tropical birds. Further research is needed to include a wider array of urbanisation conditions and drivers of the singing routines of urban tropical birds. —Marín-Gómez, O.H. & MacGregor-Fors, I. (2019). How early do birds start chirping? Dawn chorus onset and peak times in a Neotropical city.
Address
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Notes Approved no
Call Number IDA @ intern @ Serial 2553
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Author Beebe, W.
Title Rediscovery of the Bermuda cahow Type Journal Article
Year 1935 Publication Bulletin of the New York Zoological Society Abbreviated Journal
Volume 38 Issue Pages 187-190
Keywords (up) Animals
Abstract
Address
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Notes Approved no
Call Number GFZ @ kyba @ Serial 2556
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Author Ulgezen, Z.N.; Kapyla, T.; Meerlo, P.; Spoelstra, K.; Visser, M.E.; Dominoni, D.M.
Title The preference and costs of sleeping under light at night in forest and urban great tits Type Journal Article
Year 2019 Publication Proceedings. Biological Sciences Abbreviated Journal Proc Biol Sci
Volume 286 Issue 1905 Pages 20190872
Keywords (up) Animals
Abstract Artificial light at night (ALAN) is an increasing phenomenon associated with worldwide urbanization. In birds, broad-spectrum white ALAN can have disruptive effects on activity patterns, metabolism, stress response and immune function. There has been growing research on whether the use of alternative light spectra can reduce these negative effects, but surprisingly, there has been no study to determine which light spectrum birds prefer. To test such a preference, we gave urban and forest great tits (Parus major) the choice where to roost using pairwise combinations of darkness, white light or green dim light at night (1.5 lux). Birds preferred to sleep under artificial light instead of darkness, and green was preferred over white light. In a subsequent experiment, we investigated the consequence of sleeping under a particular light condition, and measured birds' daily activity levels, daily energy expenditure (DEE), oxalic acid as a biomarker for sleep debt and cognitive abilities. White light affected activity patterns more than green light. Moreover, there was an origin-dependent response to spectral composition: in urban birds, the total daily activity and night activity did not differ between white and green light, while forest birds were more active under white than green light. We also found that individuals who slept under white and green light had higher DEE. However, there were no differences in oxalic acid levels or cognitive abilities between light treatments. Thus, we argue that in naive birds that had never encountered light at night, white light might disrupt circadian rhythms more than green light. However, it is possible that the negative effects of ALAN on sleep and cognition might be observed only under intensities higher than 1.5 lux. These results suggest that reducing the intensity of light pollution as well as tuning the spectrum towards long wavelengths may considerably reduce its impact.
Address 5 Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow , Glasgow , UK
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Language English Summary Language Original Title
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Series Volume Series Issue Edition
ISSN 0962-8452 ISBN Medium
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Notes PMID:31213184; PMCID:PMC6599990 Approved no
Call Number GFZ @ kyba @ Serial 2557
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Author Dias, K.S.; Dosso, E.S.; Hall, A.S.; Schuch, A.P.; Tozetti, A.M.
Title Ecological light pollution affects anuran calling season, daily calling period, and sensitivity to light in natural Brazilian wetlands Type Journal Article
Year 2019 Publication The Science of Nature Abbreviated Journal Sci Nat
Volume 106 Issue 7-8 Pages 46
Keywords (up) Animals
Abstract Ecological light pollution alters an environment's light cycle, potentially affecting photoperiod-controlled behavior. Anurans, for example, generally breed nocturnally, and the influence of light pollution on their natural history may therefore be especially strong. In this study, we tested this hypothesis by measuring male calling behavior of anuran communities in natural wetlands in southern Brazil exposed or not exposed to street lights. We recorded seasonal and diel calling activity and calling response to a light pulse. The peak calling season differed between continuously lit and unlit locations with most species in illuminated wetlands shortening their calling season and calling earlier in the year. In unlit breeding sites, Boana pulchella, Pseudis minuta, and Pseudopaludicola falcipes confined their calling activity to well-defined hours of the night, but in continuously lit areas, these species called more continuously through the night. A 2-minute light pulse inhibited calling, but only in unlit wetlands. After a light pulse, frogs quickly resumed calling-suggesting acclimatization to brief artificial light exposure. Our field experiment presents a convincing example of ecological light pollution showing that artificial light alters the seasonal and diel calling time of some South American wetland anurans. It also documents their acclimatization to brief lighting when being continuously exposed to light.
Address Laboratorio de Ecologia de Vertebrados Terrestres, Universidade do Vale do Rio dos Sinos – UNISINOS, Campus Sao Leopoldo, Rio Grande, Rio Grande do Sul, 93020-190, Brazil
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Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0028-1042 ISBN Medium
Area Expedition Conference
Notes PMID:31280391 Approved no
Call Number GFZ @ kyba @ Serial 2560
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