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INTERSPECIFIC ALLOMETRY OF THE TELEOST VISUAL SYSTEM; A NEW APPROACH by NICO A.M. SCHELLART and MAARTEN PRINS (Lab. of Medical Physics, Academic Medical Centre, University of Amsterdam, Meibergdreif 15, 1105 AZ Amsterdam, The Netherlands) ABSTRACT The capabilities of spatial vision of 31 species of fishes were estimated using a mathe- matical model that is based upon the allometry of the eye and the retinorecipient tectal layers, the Stratum opticum (SO) and the Stratum fibrosum et griseum superficiale (SFGS). The four parameters of the model are the focal length of the eye, the linear size of SO + SFGS, the thickness of SO + SFGS and the density of the optic projection within these layers. The visual index is defined as the product of these parameters, which show a high mutual positive correlation. The volume of SO + SFGS is, irrespec- tive of fish size and species, linearly proportional to the retinal surface area. To establish intraspecific allometric relations, the allometric function y = kxd(1-alogx) was used, with d being a natural number dependent on the dimensions of x and y. The visual index correlates with published data on psychophysically determined minimum resolvable angles and it appears to be
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 1992
Keywords: allometric model; teleosts; visual index; habitat; tectum opticum; spatial vision; behaviour; eye
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