Seasonal singing of a songbird living near the equator correlates with minimal changes in day length

Abstract Behaving in accordance with natural cycles is essential for survival. Birds in the temperate regions use the changes of day length to time their behavior. However, at equatorial latitudes the photoperiod remains almost constant throughout the year, and it is unclear which cues songbirds use...

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Autores principales:	Rene Quispe, João Marcelo Brazão Protazio, Manfred Gahr
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/657b4f2ec05f45e5a1beef928b642b3f
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spelling	oai:doaj.org-article:657b4f2ec05f45e5a1beef928b642b3f2021-12-02T12:32:54ZSeasonal singing of a songbird living near the equator correlates with minimal changes in day length10.1038/s41598-017-08800-62045-2322https://doaj.org/article/657b4f2ec05f45e5a1beef928b642b3f2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08800-6https://doaj.org/toc/2045-2322Abstract Behaving in accordance with natural cycles is essential for survival. Birds in the temperate regions use the changes of day length to time their behavior. However, at equatorial latitudes the photoperiod remains almost constant throughout the year, and it is unclear which cues songbirds use to regulate behaviors, such as singing. Here, we investigated the timing of dawn-song of male silver-beaked tanagers in the equatorial lowland Amazonas over two years. In this region, birds experience around nine minutes of annual day length variation, with sunrise times varying by 32 minutes over the year. We show that the seasonal timing of dawn-song was highly regular between years, and was strongly correlated with slight increases in day length. During the singing season the daily dawn-song onset was precisely aligned to variations in twilight time. Thus, although photoperiodic changes near the equator are minimal, songbirds can use day length variation to time singing.Rene QuispeJoão Marcelo Brazão ProtazioManfred GahrNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-6 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Rene Quispe João Marcelo Brazão Protazio Manfred Gahr Seasonal singing of a songbird living near the equator correlates with minimal changes in day length
description	Abstract Behaving in accordance with natural cycles is essential for survival. Birds in the temperate regions use the changes of day length to time their behavior. However, at equatorial latitudes the photoperiod remains almost constant throughout the year, and it is unclear which cues songbirds use to regulate behaviors, such as singing. Here, we investigated the timing of dawn-song of male silver-beaked tanagers in the equatorial lowland Amazonas over two years. In this region, birds experience around nine minutes of annual day length variation, with sunrise times varying by 32 minutes over the year. We show that the seasonal timing of dawn-song was highly regular between years, and was strongly correlated with slight increases in day length. During the singing season the daily dawn-song onset was precisely aligned to variations in twilight time. Thus, although photoperiodic changes near the equator are minimal, songbirds can use day length variation to time singing.
format	article
author	Rene Quispe João Marcelo Brazão Protazio Manfred Gahr
author_facet	Rene Quispe João Marcelo Brazão Protazio Manfred Gahr
author_sort	Rene Quispe
title	Seasonal singing of a songbird living near the equator correlates with minimal changes in day length
title_short	Seasonal singing of a songbird living near the equator correlates with minimal changes in day length
title_full	Seasonal singing of a songbird living near the equator correlates with minimal changes in day length
title_fullStr	Seasonal singing of a songbird living near the equator correlates with minimal changes in day length
title_full_unstemmed	Seasonal singing of a songbird living near the equator correlates with minimal changes in day length
title_sort	seasonal singing of a songbird living near the equator correlates with minimal changes in day length
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/657b4f2ec05f45e5a1beef928b642b3f
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Seasonal singing of a songbird living near the equator correlates with minimal changes in day length

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