larrea {asbio}

Creosote bush counts

Description

Phillips and MacMahon (1981) conducted an extensive study of Larrea tridentata (creosote bush) distributions in the Mojave and Sonoran deserts from several life stage classes based areal coverage: Life stage 1 (102 -103 cm^2) Life stage 2 (103 -104 cm^2), and Life stage 3 (104 -105 cm^2). Data were generated (using variance and mean values, and the function rpois to approximate the results of the authors.

Usage

data(larrea)

Format

A data frame with 25 observations on the following 3 variables.

class1

Counts from life stage 1

class2

Counts from life stage 2

class3

Counts from life stage 3

References

Phillips, D. L., and J. A. MacMahon (1981) Competition and spacing patterns in desert shrubs. Journal of Ecology 69(1): 97-115.