A new argument against cooling by convective air eddies formed above sunlit zebra stripes

Abstract There is a long-lasting debate about the possible functions of zebra stripes. According to one hypothesis, periodical convective air eddies form over sunlit zebra stripes which cool the body. However, the formation of such eddies has not been experimentally studied. Using schlieren imaging...

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Autores principales:	Ádám Pereszlényi, Dénes Száz, Imre M. Jánosi, Gábor Horváth
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/15551699764f47bfa93340a5233026f5
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id	oai:doaj.org-article:15551699764f47bfa93340a5233026f5
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spelling	oai:doaj.org-article:15551699764f47bfa93340a5233026f52021-12-02T17:06:10ZA new argument against cooling by convective air eddies formed above sunlit zebra stripes10.1038/s41598-021-95105-42045-2322https://doaj.org/article/15551699764f47bfa93340a5233026f52021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95105-4https://doaj.org/toc/2045-2322Abstract There is a long-lasting debate about the possible functions of zebra stripes. According to one hypothesis, periodical convective air eddies form over sunlit zebra stripes which cool the body. However, the formation of such eddies has not been experimentally studied. Using schlieren imaging in the laboratory, we found: downwelling air streams do not form above the white stripes of light-heated smooth or hairy striped surfaces. The influence of stripes on the air stream formation (facilitating upwelling streams and hindering horizontal stream drift) is negligible higher than 1–2 cm above the surface. In calm weather, upwelling air streams might form above sunlit zebra stripes, however they are blown off by the weakest wind, or even by the slowest movement of the zebra. These results forcefully contradict the thermoregulation hypothesis involving air eddies.Ádám PereszlényiDénes SzázImre M. JánosiGábor HorváthNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ádám Pereszlényi Dénes Száz Imre M. Jánosi Gábor Horváth A new argument against cooling by convective air eddies formed above sunlit zebra stripes
description	Abstract There is a long-lasting debate about the possible functions of zebra stripes. According to one hypothesis, periodical convective air eddies form over sunlit zebra stripes which cool the body. However, the formation of such eddies has not been experimentally studied. Using schlieren imaging in the laboratory, we found: downwelling air streams do not form above the white stripes of light-heated smooth or hairy striped surfaces. The influence of stripes on the air stream formation (facilitating upwelling streams and hindering horizontal stream drift) is negligible higher than 1–2 cm above the surface. In calm weather, upwelling air streams might form above sunlit zebra stripes, however they are blown off by the weakest wind, or even by the slowest movement of the zebra. These results forcefully contradict the thermoregulation hypothesis involving air eddies.
format	article
author	Ádám Pereszlényi Dénes Száz Imre M. Jánosi Gábor Horváth
author_facet	Ádám Pereszlényi Dénes Száz Imre M. Jánosi Gábor Horváth
author_sort	Ádám Pereszlényi
title	A new argument against cooling by convective air eddies formed above sunlit zebra stripes
title_short	A new argument against cooling by convective air eddies formed above sunlit zebra stripes
title_full	A new argument against cooling by convective air eddies formed above sunlit zebra stripes
title_fullStr	A new argument against cooling by convective air eddies formed above sunlit zebra stripes
title_full_unstemmed	A new argument against cooling by convective air eddies formed above sunlit zebra stripes
title_sort	new argument against cooling by convective air eddies formed above sunlit zebra stripes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/15551699764f47bfa93340a5233026f5
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A new argument against cooling by convective air eddies formed above sunlit zebra stripes

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