weeds {primer}

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.

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