Locations of Nyssa (tupelo) trees in South Carolina

These data were made available in the data webpage of the book by Gaetan and Guyon, courtesy of Philip Dixon.

Description:

Location of male, female, and juvenile tupelo trees in 3 plots in the Savannah River, Barnwell County, South Carolina.

Format:

• plot: number of the plot
• sex: sex of the tree
• x, y: coordinates.

Usage:

library(ggplot2)
X <- read.table("~/Desktop/tupelo.txt",header=T)
ggplot(X) + geom_point(aes(x,y,colour=sex))  + geom_facet(~plot())

References:

Shea, M.M., Dixon, P.M. and Sharitz R.R. (1993), Size differences, sex ratio, and spatial distribution of male and female water tupelo, Nyssa aquatica (Nyssaceae), American Journal of Botany, 80, 26--30.