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• W2922237265 abstract "The aim of the study is to investigate two different impacts on the visual system of strictly nocturnal frogs, specifically the red-eyed tree frog (Agalychnis callidryas), which could have an influence on their visual spectral sensitivity. The first aim is to investigate the influence of the high signal-to-noise ratio in the visual system of frogs which results in extremely low absolute thresholds and hence should enable the frogs to use a broad range of the sensitivity spectrum of their visual pigments. To test whether the visual spectrum is broadened in A. callidryas, a behavioural experiment was conducted where the hunting success of eight adult individuals of this species was evaluated in a feeding paradigm where the frogs had to catch small crickets under different spectral light conditions. The seven tested illuminations included five conditions in the visible range (400 – 700 nm) and two in the near-infrared range (875 nm, 940 nm). The results show that the red-eyed tree frog is able to catch prey under pure infrared illumination which is the first description of a complex visually-guided natural behaviour in a terrestrial vertebrate (here: prey catching in frogs) that can be performed under infrared light. The data suggests a broadening of the visual spectrum of A. callidryas into the near-infrared range by an extended usability of the absorption spectrum of the visual pigments in the rods. The second aim of the study is to investigate whether special adaptations of retinal spectral sensitivity exist in the red-eyed tree frog due to its strictly nocturnal life style. To reveal such an adaptation for night vision, the relative spectral sensitivity of five individuals was established by visual threshold determinations over the expected visual spectrum of the frog (350 – 700 nm). Visual thresholds were obtained by recording of full-field electroretinograms (ERG) under stimulation with nearly monochromatic light (T0,5 10 nm). Results show that the photopic sensitivity of A. callidryas is peaking around 560 nm whereas the scotopic sensitivity maximum is at about 500 nm which is in conformity with the common pattern in frogs. This leads to the conclusion that the spectral sensitivity of the red-eyed tree frog is not modified in a way which could be interpreted as an adaptation to the illuminating conditions at night. The data confirms the observation that, in terrestrial vertebrates, the scotopic sensitivity is spectrally adapted to the wavelength range around 500 nm." @default.
• W2922237265 created "2019-03-22" @default.
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• W2922237265 date "2013-01-01" @default.
• W2922237265 modified "2023-09-24" @default.
• W2922237265 title "Visual spectral sensitivity and adaptation in nocturnal treefrogs" @default.
• W2922237265 hasPublicationYear "2013" @default.
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