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Retinal Resolving Power and Sensitivity of the Photopic System in Seven Haplochromine Species (Teleostei, Cichlidae)

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Retinal parameters of the photopic system are determined in seven adult haplochromine cichlids. Resolving power is calculated as a function of the density of the twin-cones and the size of the eye-lens. The size of the twin-cones is considered to be a useful criterion to compare their sensitivity. Intra-retinal variation of the resolving power shows a negative correlation with the variation of the sensitivity of the photopic system. Interspecific variation of the resolving power and the sensitivity both show a positive correlation with the absolute eye-size. A maximum packing of the cones is approached in the examined species, except in Haplochromis microdon. Variation of the resolving power is discussed in relation with the theoretical value of the optical resolving power as calculated by OTTEN (1981). The significance of this variation is correlated with ecological data.

Affiliations: 1: Research- Group Ecological Morphology, Zoölogisch Laboratorium, University of Leiden, Postbus 9516, 2300 RA Leiden, The Netherlands

10.1163/002829684X00146
/content/journals/10.1163/002829684x00146
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/content/journals/10.1163/002829684x00146
1983-01-01
2016-12-11

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