vision in cichlids optical quality and visual perception in cichlidae (pisces)
TRANSCRIPT
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VISION IN CICHLIDS
Optical quality and visual perception
in Cichlidae (Pisces)
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Spherical aberration
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Chromatic aberration
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Accommodation
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Optical resolution
• Little spherical aberration
• Accommodation by movement of the lens (b)
• Optical relation:
• 1/f = 1/v + 1/b
• Focal distance f = 2,3 r (r is lens-radius)• Image distance b = 2,55 r (mean vallue; Matthiessen’s ratio)
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VERTEBRATE RETINA
• Rods & Cones
• Bipolar &
amacrine cells
• Ganglion cells
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PHOTORECEPTORS
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ontogenetic cone size
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Incompatability of photopic sensitivity & resolution
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Spatial resolution
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Retinal resolution & sensitivity
• Angular density:• H = (2,55 – v) . /360 }2. D number /o
• Minimum separable = (H-1)0,5 60 min of arc
• Unit photon catching ability (threshold value)• Vc = (2Sd + Ss)1,5
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Colour vision
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Photoreceptor absorption spectra
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Spectral distribution in various aquatic environments (Levine et al., 1979)
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Transformation parameters of double cones and cone mosaic
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square or row mosaic
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sympatric speciation
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The End