Vision in avian emberizid foragers: maximizing both binocular vision and fronto-lateral visual acuity

The Journal of Experimental Biology
Bret A MooreEsteban Fernández-Juricic

Abstract

Avian species vary in their visual system configuration, but previous studies have often compared single visual traits between two to three distantly related species. However, birds use different visual dimensions that cannot be maximized simultaneously to meet different perceptual demands, potentially leading to trade-offs between visual traits. We studied the degree of inter-specific variation in multiple visual traits related to foraging and anti-predator behaviors in nine species of closely related emberizid sparrows, controlling for phylogenetic effects. Emberizid sparrows maximize binocular vision, even seeing their bill tips in some eye positions, which may enhance the detection of prey and facilitate food handling. Sparrows have a single retinal center of acute vision (i.e. fovea) projecting fronto-laterally (but not into the binocular field). The foveal projection close to the edge of the binocular field may shorten the time to gather and process both monocular and binocular visual information from the foraging substrate. Contrary to previous work, we found that species with larger visual fields had higher visual acuity, which may compensate for larger blind spots (i.e. pectens) above the center of acute vision, enhanc...Continue Reading

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Citations

Jan 13, 2017·Scientific Reports·Bret A MooreEsteban Fernández-Juricic
Mar 30, 2017·PloS One·Luke P Tyrrell, Esteban Fernández-Juricic
Nov 23, 2017·Frontiers in Neuroscience·Graham R Martin
May 20, 2018·The Journal of Experimental Biology·Simon PotierFrancesco Bonadonna
Jan 26, 2020·Veterinary Ophthalmology·Filipe Espinheira GomesJessica McArt
Feb 9, 2019·Anatomia, histologia, embryologia·Andreas Bringmann
Feb 15, 2018·Frontiers in Neuroscience·Luke P TyrrellEsteban Fernández-Juricic
Oct 28, 2019·The Journal of Experimental Biology·Jessica L Yorzinski
Nov 30, 2019·Nature Reviews. Neuroscience·Tom BadenPhilipp Berens
Oct 31, 2020·Current Biology : CB·Jay A StafstromRonald R Hoy
Jul 4, 2015·The Journal of Experimental Biology·Luke P TyrrellEsteban Fernández-Juricic
May 7, 2021·Experimental Brain Research·Jessica L Yorzinski
Sep 24, 2021·Veterinary Ophthalmology·Suelen Berger BaldottoFabiano Montiani-Ferreira

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