Current Contents

20. Measuring Multivariate Selection

• Selection on Multivariate Phenotypes: Differentials and Gradients
  • Changes in the mean vector: the directional selection differential s
  • The directional selection gradient boldbeta
  • Directional gradients, fitness surface geometry and selection response
  • Changes in the covariance matrix: the quadratic selection differential C
  • The quadratic selection gradient boldgamma
  • Quadratic gradients, fitness surface geometry and selection response
  • Summary
• Multivariate Quadratic Fitness Regressions
  • Estimation, hypothesis testing and confidence intervals
  • Geometric aspects
  • Unmeasured characters and other biological caveats
  • The bias due to environmental correlations between fitness and characters
• Path Analysis and Fitness Estimation

PDF versions of a recent draft of this chapter are available. Feel free to use this for personal and/or class use until the book is available. Please note that these are copyrighted and that I would greatly appreciate feedback . Note that while the screen view can look funny in places, the printed output is fine.

• Chapter 20 PDF file ( v. 16 March 1998 ): (22 typeset pages, 646K)

Programs

• A Mathematica notebook that computes and plots the within- and between-generation changes in the phenotypic and genotypic values for a bivariate character under a Gaussian infinitesimal model.