Does light pollution alter daylength? A test using light loggers on free-ranging European blackbirds (Turdus merula)

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Davide M Dominoni, Jesko Partecke

Abstract

Artificial light at night is one of the most apparent environmental changes accompanying anthropogenic habitat change. The global increase in light pollution poses new challenges to wild species, but we still have limited understanding of the temporal and spatial pattern of exposure to light at night. In particular, it has been suggested by several studies that animals exposed to light pollution, such as songbirds, perceive a longer daylength compared with conspecifics living in natural darker areas, but direct tests of such a hypothesis are still lacking. Here, we use a combination of light loggers deployed on individual European blackbirds, as well as automated radio-telemetry, to examine whether urban birds are exposed to a longer daylength than forest counterparts. We first used activity data from forest birds to determine the level of light intensity which defines the onset and offset of daily activity in rural areas. We then used this value as threshold to calculate the subjective perceived daylength of both forest and urban blackbirds. In March, when reproductive growth occurs, urban birds were exposed on average to a 49-min longer subjective perceived daylength than forest ones, which corresponds to a 19-day difference ...Continue Reading

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Citations

Feb 19, 2016·Biology Letters·Davide M DominoniRandy J Nelson
Dec 26, 2015·Physiology & Behavior·Maaike de JongMarcel E Visser
Mar 18, 2015·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Kevin J GastonFranz Hölker
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Sep 21, 2016·Ecology and Evolution·Davide M DominoniHenrik Brumm
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Jul 31, 2018·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·Davide M DominoniBarbara Helm
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Oct 11, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Davide M DominoniMartin Bulla
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Jul 24, 2021·Royal Society Open Science·Ayumu MukaiShin G Goto

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