Asymmetry of eye color in the common cuckoo

Abstract Bilateral symmetry is assumed to contribute to the evolution of eye color, with the left and right eye being the same color in most vertebrates; yet, few studies tested this assumption. Here, we compared the amount of iris flecking (black spots presented on the iris) between the left and ri...

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Autores principales:	Ha-Na Yoo, Jin-Won Lee, Jeong-Chil Yoo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f5e56dd0bef04ce99a8c807f0b77c433
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spelling	oai:doaj.org-article:f5e56dd0bef04ce99a8c807f0b77c4332021-12-02T16:08:21ZAsymmetry of eye color in the common cuckoo10.1038/s41598-017-08071-12045-2322https://doaj.org/article/f5e56dd0bef04ce99a8c807f0b77c4332017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08071-1https://doaj.org/toc/2045-2322Abstract Bilateral symmetry is assumed to contribute to the evolution of eye color, with the left and right eye being the same color in most vertebrates; yet, few studies tested this assumption. Here, we compared the amount of iris flecking (black spots presented on the iris) between the left and right eye of 76 adult common cuckoos Cuculus canorus. We found considerable variation in the total amount of iris flecking among individuals, with variation being associated with body size and sex. We also found that the amount of iris flecking differed between the left and right eye and that this left-right asymmetry was not random, with the left eye almost always being darker than the right eye. Furthermore, this asymmetry was negatively associated with wing length; however, this effect was limited to individuals with dark eyes. Overall, the asymmetric, but non-random, distribution of iris flecking between the left and right eye may indicate that selection pressures driving asymmetry (such as visual lateralization) act on the development of iris colors, even though this effect might be limited, due to the role of bilateral symmetry.Ha-Na YooJin-Won LeeJeong-Chil YooNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ha-Na Yoo Jin-Won Lee Jeong-Chil Yoo Asymmetry of eye color in the common cuckoo
description	Abstract Bilateral symmetry is assumed to contribute to the evolution of eye color, with the left and right eye being the same color in most vertebrates; yet, few studies tested this assumption. Here, we compared the amount of iris flecking (black spots presented on the iris) between the left and right eye of 76 adult common cuckoos Cuculus canorus. We found considerable variation in the total amount of iris flecking among individuals, with variation being associated with body size and sex. We also found that the amount of iris flecking differed between the left and right eye and that this left-right asymmetry was not random, with the left eye almost always being darker than the right eye. Furthermore, this asymmetry was negatively associated with wing length; however, this effect was limited to individuals with dark eyes. Overall, the asymmetric, but non-random, distribution of iris flecking between the left and right eye may indicate that selection pressures driving asymmetry (such as visual lateralization) act on the development of iris colors, even though this effect might be limited, due to the role of bilateral symmetry.
format	article
author	Ha-Na Yoo Jin-Won Lee Jeong-Chil Yoo
author_facet	Ha-Na Yoo Jin-Won Lee Jeong-Chil Yoo
author_sort	Ha-Na Yoo
title	Asymmetry of eye color in the common cuckoo
title_short	Asymmetry of eye color in the common cuckoo
title_full	Asymmetry of eye color in the common cuckoo
title_fullStr	Asymmetry of eye color in the common cuckoo
title_full_unstemmed	Asymmetry of eye color in the common cuckoo
title_sort	asymmetry of eye color in the common cuckoo
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/f5e56dd0bef04ce99a8c807f0b77c433
work_keys_str_mv	AT hanayoo asymmetryofeyecolorinthecommoncuckoo AT jinwonlee asymmetryofeyecolorinthecommoncuckoo AT jeongchilyoo asymmetryofeyecolorinthecommoncuckoo
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Asymmetry of eye color in the common cuckoo

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