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6 - Innovation and diversity in functional morphology

Published online by Cambridge University Press:  28 June 2009

Manfred D. Laubichler
Affiliation:
Arizona State University
Jane Maienschein
Affiliation:
Arizona State University
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Summary

INTRODUCTION

Form and function are so intricately intertwined that it is tempting to view them as nothing more than different viewpoints on the phenotype – one reflecting the other like a mirror. And it is true that some organismal function can be revealed right there in the anatomy. But life is more complex than this, and while form does play a huge role in how structures are used and how they perform, it is not the only factor involved, and, in fact, the mapping of form to function can be surprisingly complex, with considerable subtlety. Emergent mechanical properties of structural systems can often be inferred or directly measured from form, but when it comes to actual function – how the structure is used by the organism – few systems are simple enough and so constrained that function can be completely inferred from form. Thus, while mechanical advantage of muscle acting across a joint can be calculated accurately from morphology, one could not predict the kinematics of locomotion in a quadrupedal vertebrate from limb morphology. The degrees of freedom in motion are too many and ultimately function must be measured in any but the simplest system before insight can be gained into how form influences function. Indeed, much of our intuition of form–function relationships is developed from studying the relationship empirically in one organism and then assuming certain commonalities in making predictions about unstudied organisms. This is not the same as being able to build predictions of function directly from form.

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Publisher: Cambridge University Press
Print publication year: 2009

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