weeds {primer}R Documentation

Percent cover of six perennial herbaceous plants

Description

Percent cover of six of the most common herbaceous perennial species from the Buell-Small long term succession study (http://www.ecostudies.org/bss/). Data are plot-level visual estimates of percent cover.

Usage

data(weeds)

Format

A data frame with 15140 observations on the following 8 variables.

X
a numeric vector
Genus
a factor with levels Aster Euthamia Solidago
Epithet
a factor with levels canadensis gigantea graminifolia novae-angliae pilosus rugosa
FieldName
a factor with levels C3 C4 C5 C6 C7 D1 D2 D3 E1 E2
Age
a numeric vector indicating the number of years of succession, since abandonment from agriculture.
PlotId
a numeric vector
Cover
a numeric vector; percent cover, estimated visually.
Species
a factor with levels A.novae-angliae A.pilosus E.graminifolia S.canadensis S.gigantea S.rugosa

Source

Data graciously provided by Scott Meiners (Eastern Illinois University, http://www.ecostudies.org/bss/).

References

Stevens, M.H.H. 2009. A Primer of Ecology with R. Use R! Series. Springer.

Examples

data(weeds)
str(weeds); 
library(lattice)
xyplot(Cover ~ Age, data=weeds, groups=Species, type=c("a"),
auto.key=list(lines=TRUE, points=FALSE, columns=3),
ylim=c(-1,20))

[Package primer version 0.1 Index]