Seasonal changes in retinal function of the frog Rana Ridibunda |
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Authors: | HJ Schäfer U Schmidt |
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Institution: | Zoologisches Institut der Universität, Poppelsdorfer Schloss, D-5300 Bonn Federal Republic of Germany |
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Abstract: | The electroretinogram (ERG) of Rana ridibunda was recorded at different times of the year. The frogs exhibited distinct seasonal changes in various parameters of the ERG.The amplitudes of both the a- and the b-waves were greater in summer than in winter. With a luminance of 3000 cd/m2 the mean amplitude of the a-wave ranged from minimal 30 μ V (February) to maximal 60 μ V (July), and that of the b-wave from 190 μ V (February) to maximal 550 μ V (June). Average latency was about 28 ms in winter and 14 ms in summer. The greatest difference was found in flicker-fusion frequency which averaged 29 Hz in July and 9 Hz in January. There was also a significant change in the average threshold for response to white light (0.011 cd/m2 in March). |
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