Polar bear (Ursus maritimus)

Containing taxa: Animalia » Chordata » Osteichthyes » Sarcopterygii » Tetrapoda » Mammalia » Eutheria » Laurasiatheria » Carnivora » Caniformia » Ursidae

Photoreceptors:
Receptor Opsin λmax Filter λmax Filter λ50% Recep. λmax
Yellow cone553nm  553nm
Rod501nm  501nm
Blue cone441nm  446nm


Opponent processes:
Description (+) Terminus (-) Terminus Mode
Luminance (photopic)
Yellow cone   Photopic
Luminance (scotopic)
Rod   Scotopic
Lime-Blue
562nm - 502nm - 443nm
 
Yellow cone Blue cone
(Rod)
Photopic
Cones-Rods
591nm - 536nm - 478nm
 
Yellow cone Rod Mesopic

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Notes and References:

Levenson, D H, Ponganis, P J, Crognale, M A, Deegan, J F, Dizon, A, Jacobs, G H. (2006) Visual pigments of marine carnivores: pinnipeds, polar bear, and sea otter. Journal of Comparative Physiology A-Neuroethology Sensory Neural and Behavioral Physiology, 192(8) 833-843

Warrant E.J., Nilsson D.-E. (1998) Absorption of White Light in Photoreceptors. Vision Res., Vol. 38, No. 2, pp. 195-207. PII: S0042-6989(97)00151-X

Stavenga D., Smits R.P., Hoenders B.J. (1993) Simple Exponential Functions Describing the Absorbance Bands of Visual Pigment Spectra. Vision Res. 33(8) pp. 1011-1017. doi:10.1016/0042-6989(93)90237-Q



Note: Many species may have gaps in available data, which may be filled in with extrapolations from closely related species. The AVIAN website is copyright © 2011-2024 J. Gagnon. All rights reserved unless otherwise specified.