| Project/Area Number |
59540466
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
動物発生・生理学
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| Research Institution | Yokohama City University, Faculty of Liberal Arts and Sciences. |
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Principal Investigator |
EGUCHI Eisuke Yokohama City University, Fac. of Liberal Arts and Sciences., 文理学部, 教授 (90046003)
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| Co-Investigator(Kenkyū-buntansha) |
ARIKAWA Kentaro Yokohama City University, Fac. of Liberal Arts and Sciences., 文理学部, 助手 (20167232)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1986: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1985: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1984: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Compound eye / Colour vision / Rhabdom;Spectral Sensitivity / Porphyropsin / レチナール |
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| Research Abstract |
The relationships between the visual functions and behavioural patterns of insects were studied on the various kinds of (46 species) lepidopterans with various temporal behavioural patterns such as nocturnal and diurnal activities. Namely stimulus intensity-response relations (V-log Icurves) were electrophysiologically (ERG) determined for the compound eyes of lepidopterans belonging to the five different groups: butterflies (22 spcies), hesperids (3 species), diurnal sphingids (2 species), diurnal moths (3 spcies) and nocturnal moths (16 species). The slope of V-log I curves are inversely proportional to the ratio of rhabdom to retinula volume in the various eye types. In all groups except diurnal moths, the light intensity which produces maximal and saturated responses are nearly the same, therefore the nocturnal moths which have the lowest threshold to light increse their sensitivity to dim light mainly by decreasing the slopes of V-log I curves.
Secondly we investigated electrophysiologically the colour vision system of Papilionid butterfly Papilio xuthus by intracellular recording methods, and found that they have five different colour receptors (ultraviolet, violet, blue,green and red. The regional distributions of these colour receptors in the compound eyes were investigated by ERG method and the results were related with their behavioural patterns such as flower-visits and matings.
Thirdly , we found the rhodopsin-porphyropsin visual system in invertebrates, namely crayfish contains 3-dehydroretinal as well as retinal as chromophore in their visual substance in the compound eyes. It is found that the ratio of these two chromophores varies with the environmental factors such as light regimes and temperature.
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