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Extracellular recordings reveal absence of magneto sensitive units in the avian optic tectum
(Springer Verlag, 2014)
© 2014, The Author(s).There is a consensus that birds detect the earth’s magnetic field and use some of its features for orientation and homing purposes. Since the late 1960s, when the first solid behavioral evidence of ...
Subtle sexual plumage color dimorphism and size dimorphism in a South American colonial breeder, the Monk Parakeet (Myiopsitta monachus)
(BioMed Central Ltd., 2020-06)
Parrots (Psittacidae Family) are one of the most colorful groups of birds in the world, their colors produced both structurally and via unusual pigments (psittacofulvins). Most species are considered to be monogamous, and ...
Determination of Tear Production and Intraocular Pressure With Rebound Tonometry in Wild Humboldt Penguins (Spheniscus humboldti)
(BioOne, 2017)
Tear production and intraocular pressures (IOPs) were determined in 38 and 102 wild Humboldt penguins (Spheniscus humboldti), respectively, from the Punta San Juan Marine Protected Area in Ica, Peru. Tear production was ...
Exploring the Potential Implications of Variation in Optical Density for the Coevolution of Avian Visual Systems and Color Signals
(Universidad de los AndesMaestría en Ciencias BiológicasFacultad de CienciasDepartamento de Ciencias Biológicas, 2022)
Color vision enables visually oriented animals to sense their environments and successfully perform most of their vital activities. Several studies have demonstrated that natural and sexual selection may shape the evolution ...
Circadian Control of the Pupillary Light Responses in an Avian Model of Blindness, the GUCY1* Chickens
(Association For Research In Vision And Ophthalmology, 2015-01)
PURPOSE. The vertebrate inner retina has a subset of intrinsically photosensitive retinal ganglion cells (ipRGCs) that express the nonvisual photopigment melanopsin. The intrinsically photosensitive retinal ganglion cells ...
The hidden world of egg coloration: Exploring the drivers of variation in UV reflectance
(Universidad de los AndesBiologíaFacultad de CienciasDepartamento de Ciencias Biológicas, 2023-08-04)
Understanding how selection pressures operate at different evolutionary scales to promote diversity in various species' traits and phenotypes has long intrigued evolutionary biologists. In recent years, efforts have been ...
Tonometria e ecobiometria ocular em tucano-toco (Ramphastos toco) e tucano-de-bico-verde (Ramphastos dicolorus)
(Universidade Federal de Santa MariaBRMedicina VeterináriaUFSMPrograma de Pós-Graduação em Medicina Veterinária, 2015-12-18)
The eyesight of birds is essential for their survival in a free environment; tiny alteration in this organ may cause loss of vision, consequently the difficulty or even the impossibility to hunt, move or protect themselves ...
Spectral sensitivities of photoreceptors and their role in colour discrimination in the green-backed firecrown hummingbird (Sephanoides sephaniodes)
(2008)
We studied the photopic spectral sensitivity in the green-backed firecrown, Sephanoides sephaniodes, a South American hummingbird, and its possible ecological relationship with preferred flowers and body colouration. Avian ...
Axon terminals from the nucleus isthmi pars parvocellularis control the ascending retinotectofugal output through direct synaptic contact with tectal ganglion cell dendrites
(Wiley & Sons, 2016)
The optic tectum in birds and its homologue the superior colliculus in mammals both send major bilateral, nontopographic projections to the nucleus rotundus and caudal pulvinar, respectively. These projections originate ...
“Shepherd’s crook” neurons drive and synchronize the enhancing and suppressive mechanisms of the midbrain stimulus selection network
(National Academy of Sciences, 2018)
© National Academy of Sciences. All rights reserved. The optic tectum (TeO), or superior colliculus, is a multisensory midbrain center that organizes spatially orienting responses to relevant stimuli. To define the stimulus ...