Light perception capability of pallial eyes in Japanese moon scallop Amusium japonicum as determined by electroretinogram

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  • ＥＲＧで示されるツキヒガイ外套眼の光受容特性
  • ERG デ シメサレル ツキヒガイ ガイトウガン ノ ヒカリ ジュヨウ トクセイ

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Abstract

  Electroretinograms (ERGs) were recorded from the large and small pallial eyes of the scallop Amusium japonicum to determine their light perception capability. ERG recordings during the process from light to dark adaptations indicated that the light adapted eyes were completely adapted to the dark by 40 to 50 min, which was shorter than in fishes. Under two consecutive light stimulations at illuminances of 2.7 lx and 50 lx, the effect of the first stimulation on the second ERG response disappeared when the time interval between the two stimulations was longer than 20 s. Both eyes were sensitive to a wide range of spectra (433 to 700 nm) with a peak at around 470 to 520 nm, which was considered to be well adapted to the light environment of the shallow habitats of this species. ERGs were recorded under a flicker light of different flicker frequencies (0.05-10 Hz) to determine the critical fusion frequency (cff), which was 1.3 to 1.5 Hz. This much lower cff than found in fishes was considered to be due to adaptation for the detection of slow-moving objects.<br>

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