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Binocular vision and foraging in ducks, geese and swans (Anatidae)
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2023-09-06
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Anatidae
binocularity
blind area
ophthalmoscope
visual fields
binocularity
blind area
ophthalmoscope
visual fields
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Abstract
Wide variation in visual field configuration across avian species is hypothesized to be driven primarily by foraging ecology and predator detection. While some studies of selected taxa have identified relationships between foraging ecology and binocular field characteristics in particular species, few have accounted for the relevance of shared ancestry. We conducted a large-scale, comparative analysis across 39 Anatidae species to investigate the relationship between the foraging ecology traits of diet or behaviour and binocular field parameters, while controlling for phylogeny. We used phylogenetic models to examine correlations between traits and binocular field characteristics, using unidimensional and morphometric approaches. We found that foraging behaviour influenced three parameters of binocular field size: maximum binocular field width, vertical binocular field extent, and angular separation between the eye-bill projection and the direction of maximum binocular field width. Foraging behaviour and body mass each influenced two descriptors of binocular field shape. Phylogenetic relatedness had minimal influence on binocular field size and shape, apart from vertical binocular field extent. Binocular field differences are associated with specific foraging behaviours, as related to the perceptual challenges of obtaining different food items from aquatic and terrestrial environments.
Citation
Cantlay JC, Martin GR, McClelland SC, Potier S, O’Brien MF, FernándezJuricic E, Bond AL, Portugal SJ. 2023 Binocular vision and foraging in ducks, geese and swans (Anatidae). Proc. R. Soc. B 290: 20231213. https://doi.org/10.1098/rspb.2023.1213
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Journal Article
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Copyright © 2023 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution
License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original
author and source are credited. The attached file is the published version of the article.
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0962-8452
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1471-2954