ggordiplots: Make 'ggplot2' Versions of Vegan's Ordiplots

Abstract

The 'vegan' package includes several functions for adding features to ordination plots: ordiarrows(), ordiellipse(), ordihull(), ordispider() and ordisurf(). This package adds these same features to ordination plots made with 'ggplot2'. In addition, gg_ordibubble() sizes points relative to the value of an environmental variable.