Ecological Data : sites-variables, sites-species, where and when

Description

This data set contains information about sites, environmental variables and Ephemeroptera Species.

Usage

data(meau)

Format

meau is a list of 3 components.

mil

is a data frame with 24 sites and 10 physicochemical variables.

fau

is a data frame with 24 sites and 13 Ephemeroptera Species.

plan

is a data frame with 24 sites and 2 factors.

1. datis a factor with 4 levels-seasons.
2. stais a factor with 6 levels-sites.

Details

Data set equivalents to meaudret: one site (6) along the Bourne, a Meaudret affluent and one physico chemical variable - the oxygen concentration were added.

Source

Pegaz-Maucet, D. (1980) Impact d'une perturbation d'origine organique sur la dérive des macro-invertébrés benthiques d'un cours d'eau. Comparaison avec le benthos. Thèse de troisième cycle, Université Lyon 1, 130 p.

Thioulouse, J., Simier, M. and Chessel, D. (2004) Simultaneous analysis of a sequence of paired ecological tables. Ecology, 85, 1, 272–283.

Examples

data(meau)
par(mfrow = c(2,2))
pca1 <- dudi.pca(meau$mil, scan = FALSE, nf = 4)
s.class(pca1$li, meau$plan$dat, 
    sub = "Principal Component Analysis")
pca2 <- between(pca1, meau$plan$dat, scan = FALSE, nf = 2)
s.class(pca2$ls, meau$plan$dat, sub = "Between dates Principal Component Analysis")
s.corcircle(pca1$co)
s.corcircle(pca2$as)

Worked out examples

> library(ade4)
> ### Name: meau
> ### Title: Ecological Data : sites-variables, sites-species, where and when
> ### Aliases: meau
> ### Keywords: datasets
> 
> ### ** Examples
> 
> data(meau)
> par(mfrow = c(2,2))
> pca1 <- dudi.pca(meau$mil, scan = FALSE, nf = 4)
> s.class(pca1$li, meau$plan$dat, 
+     sub = "Principal Component Analysis")

> pca2 <- between(pca1, meau$plan$dat, scan = FALSE, nf = 2)
> s.class(pca2$ls, meau$plan$dat, sub = "Between dates Principal Component Analysis")

> s.corcircle(pca1$co)

> s.corcircle(pca2$as)

> 
> 
> 
>