307 BITING FORCE IN CICHLIDS: A DISCUSSION OF THE PLANAR MODEL OF BAREL (1983) by J. L. VAN LEEUWEN and C. W. SPOOR (Research Group Human-Joint Biomechanics, Department of Anatomy, University of Leiden, P.O. Box 9602, 2300 RC Leiden, The Netherlands) SUMMARY-Some consequences of a definition of the 'static biting force' in cichlid fishes by BAREL (1983) are explored. A free-body diagram of the lower jaw shows that apart from the forces of the food and the jaw adductor muscle on the jaw other forces are needed to obtain static equilibrium. The introduction of joint forces solves this problem. Our analysis also shows that in many biting activities a locomotor force is required. Starting from an alternative definition for the static biting force, quite dif- ferent results may be obtained for the space requirements of the jaw adductor muscle and the lower jaw as compared to those of BAREL. In a paper on the constructional morphology of cichlid fishes BAREL (1983, fig. 2a, redrawn as our fig. 1) presented a two dimensional model for the calculation of the biting force FT, exerted by the rostral teeth of the lower jaw of cichlid fishes. The input of the model
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 1986
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