Retinal Topography of Ganglion Cells and Putative UV-Sensitive Cones in Two Antarctic Fishers : Pagothenia borchgrevinki and Trematomus bernacchii (Nototheniidae) : Physiology
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概要
- 論文の詳細を見る
Accessory corner cones (ACC) have recently been suggested to be UV-sensitive photoreceptor cells. With a view toward explaining prey detection, we examined the topography of retinal ganglion cells and ACCs in two Antarctic nototheniids occupying different ecological niches : the cryopelagic Pagothenia borchgrevinki and the benthic Trematomus bernacchii. Isodensity maps of retinal ganglion cells showed that them ainvisual axis, coincident with the feeding vector, was in a forward direction in both species. Visual acuity was determined as 3.64 and 4.77 cycles/degree for the respective species. In P. borchgrevinki the highest density of ACCs was associated with the eye's main visual axis. This suggested that this species uses UV-vision during forward-swims and probably in encounters with prey. On the other hand, T. bernacchii possessed two horizontal band-shaped high-density are as of ACCs, which stretched from temporal to nasal and ventral to peripheral retinal regions. Therefore, this species appears to use UV-vision to watch prey across the entire circumference of the lateral area and in the water column above its head.
- 社団法人日本動物学会の論文
- 2002-11-25
著者
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IWAMI Tetsuo
Laboratory of Biology, Tokyo Kasei Gakuin University
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Iwami Tetsuo
Laboratory Of Biology Tokyo Kasei Gakuin University
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Miyazaki Taeko
Department of Radiation Protection and Safety, National Institute of Radiological Sciences
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Somiya Hiroaki
Department of LifeSciences, Faculty of Bioresources, Mie University
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Meyer-Rochow V.Benn.
Faculty of Engineering and Science, International University Bremen (IUB)
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Somiya H
Department Of Lifesciences Faculty Of Bioresources Mie University
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Miyazaki T
Canon Inc.
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Somiya Hiroaki
Department Of Lifesciences Faculty Of Bioresources Mie University
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Miyazaki Taeko
Department Of Life Sciences Faculty Of Bioresources Mie University
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Meyer‐rochow V
Faculty Of Engineering And Science International University Bremen (iub)
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Iwami Tetsuo
Laboratory Of Biology Tokyo Kasei Gakuin College
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Miyazaki Takeo
Department of Radiation Protection and Safety, National Institute of Radiological Sciences
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