Allometry

Allometry - Allometry: the study of the relationship...

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Unformatted text preview: Allometry: the study of the relationship between size and shape Galileo, 1636: Discorsi Allometry of Stegosaur plates Allometry in Tyrannosaurus forelegs Adaptive explanations Allometry in combination with Copes Rule Surface/volume considerations and Allometry Assume a spherical cow . . . Surface area of sphere: 4 r 2 Volume of sphere: 4/3 r 3 Julian Huxley and Georges Tessier SIZE OF STRUCTURE (e.g. weight of fiddler crab claw) SIZE OF BODY (e.g. weight of fiddler crab) Positive allometry field (a > 1) Negative allometry field (a < 1) Exponential form y=bx a Linear form: log(y) = a log(x)+log(b) Surface/volume and respiration in arthropods Problems of scaling to larger size Problems of scale at smaller size Surface/volume and locomotion Surface area of wings vs mass Cross sectional surface area of legs vs mass The Irish Elk Actually a deer Lived across N. Europe and Asia But a very large deer . . . Antler span up to 12 feet Prospecting for fossil Megaloceras in Irish peat bogs Allometry in the white-tailed deer Allometry can be measured within a species, usually by comparing juveniles to adults Allometry in Megaloceras Allometry of antler size comparing adults of different species of deer M indicates the Irish Elk, Megaloceras Negative allometry of metabolic heat production on body weight Do we really have big brains? Allometric curve has slope of 0.667, indicating the real relationship is between surface area of brain and size of animal Reptiles have the same slope, lower intercept on the y axis Primate brain weights plotted on the same field The real measure of...
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This note was uploaded on 10/23/2011 for the course GLY 1000 taught by Professor Parker during the Spring '11 term at FSU.

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Allometry - Allometry: the study of the relationship...

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