THE EXPANSION APPARATUS IN FISH HEADS, A 3-D KINETIC DEDUCTION by J. DE VISSER and C.D.N. BAREL* (Institute of Evolutionary and Ecological Sciences, Leiden University, Postbus 9516, 2300 RA Leiden, The Netherlands) ABSTRACT Among teleost fishes, suction feeding is the most frequent mode of obtaining food. Using a 3- D kinematic model of the suction apparatus, it is calculated for what quantitative combinations of the model's static parameters three hydrodynamic demands pertinent to suction feeding could be optimized under certain anatomical constraints. Based on these calculations and constraints each of the considered parameter value sets can be categorized as optimal, sub- optimal or overruled. The morphospace thus subdivided is called the evaluated morphospace. It demonstrates, for instance, that optimal sets are not randomly distributed in the morphospace but exhibit a certain pattern implying an interdependency of the parameter values. Of 73 East-African, lacustrine cichlid species the parameter value sets were plotted in the evaluated morphospace where these species-specific sets appear to be located in a narrow zone around the border between optimal and suboptimal sets but quite far away from the overruled sets. Remarkably, of all optimal value sets theoretically feasible, a relatively small range is actually used
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 1998
Keywords: optimality model; cichlids; suspensorium; suction feeding; hyoid; morphospace; head
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