ade4 (version 1.7-22)

doubs: Pair of Ecological Tables

Description

This data set gives environmental variables, fish species and spatial coordinates for 30 sites.

Usage

data(doubs)

Format

doubs is a list with 4 components.

env

is a data frame with 30 rows (sites) and 11 environmental variables.

fish

is a data frame with 30 rows (sites) and 27 fish species.

xy

is a data frame with 30 rows (sites) and 2 spatial coordinates.

species

is a data frame with 27 rows (species) and 4 columns (names).

Details

The rows of doubs$env, doubs$fish and doubs$xy are 30 sites along the Doubs, a French and Switzerland river.

doubs$env contains the following variables: dfs - distance from the source (km * 10), alt - altitude (m), slo (\(\ln(x + 1)\) where x is the slope (per mil * 100), flo - minimum average stream flow (m3/s * 100), pH (* 10), har - total hardness of water (mg/l of Calcium), pho - phosphates (mg/l * 100), nit - nitrates (mg/l * 100), amm - ammonia nitrogen (mg/l * 100), oxy - dissolved oxygen (mg/l * 10), bdo - biological demand for oxygen (mg/l * 10).

doubs$fish contains the abundance of the following fish species: Cottus gobio (Cogo), Salmo trutta fario (Satr), Phoxinus phoxinus (Phph), Nemacheilus barbatulus (Neba), Thymallus thymallus (Thth), Telestes soufia agassizi (Teso), Chondrostoma nasus (Chna), Chondostroma toxostoma (Chto), Leuciscus leuciscus (Lele), Leuciscus cephalus cephalus (Lece), Barbus barbus (Baba), Spirlinus bipunctatus (Spbi), Gobio gobio (Gogo), Esox lucius (Eslu), Perca fluviatilis (Pefl), Rhodeus amarus (Rham), Lepomis gibbosus (Legi), Scardinius erythrophtalmus (Scer), Cyprinus carpio (Cyca), Tinca tinca (Titi), Abramis brama (Abbr), Ictalurus melas (Icme), Acerina cernua (Acce), Rutilus rutilus (Ruru), Blicca bjoerkna (Blbj), Alburnus alburnus (Alal), Anguilla anguilla (Anan).

doubs$species contains the names of the 27 fish species. The four columns correspond to: 1 = scientific name (Genus species), 2 = French common name, 3 = English common name, 4 = Four character code.

References

See a French description of fish species at http://pbil.univ-lyon1.fr/R/pdf/pps047.pdf.
Chessel, D., Lebreton, J.D. and Yoccoz, N.G. (1987) Propriétés de l'analyse canonique des correspondances. Une illustration en hydrobiologie. Revue de Statistique Appliquée, 35, 4, 55--72.

Examples

data(doubs)
pca1 <- dudi.pca(doubs$env, scan = FALSE)
pca2 <- dudi.pca(doubs$fish, scale = FALSE, scan = FALSE)
coiner1 <- coinertia(pca1, pca2, scan = FALSE)
  
if(adegraphicsLoaded()) {
  g1 <- s.corcircle(coiner1$aX, plot = FALSE)
  g2 <- s.value(doubs$xy, coiner1$lX[, 1], plot = FALSE)
  g3 <- s.value(doubs$xy, coiner1$lX[, 2], plot = FALSE)
  g4 <- s.arrow(coiner1$c1, plot = FALSE)
  g5 <- s.match(coiner1$mX, coiner1$mY, plot = FALSE)
  g6 <- s.corcircle(coiner1$aY, plot = FALSE)
  g7 <- s.arrow(coiner1$l1, plot = FALSE)
  g8 <- s.value(doubs$xy, coiner1$lY[, 1], plot = FALSE)
  g9 <- s.value(doubs$xy, coiner1$lY[, 2], plot = FALSE)
  G <- ADEgS(list(g1, g2, g3, g4, g5, g6, g7, g8, g9), layout = c(3, 3))
  
} else {  
  par(mfrow = c(3, 3))
  s.corcircle(coiner1$aX)
  s.value(doubs$xy, coiner1$lX[, 1])
  s.value(doubs$xy, coiner1$lX[, 2])
  s.arrow(coiner1$c1)
  s.match(coiner1$mX, coiner1$mY)
  s.corcircle(coiner1$aY)
  s.arrow(coiner1$l1)
  s.value(doubs$xy, coiner1$lY[, 1])
  s.value(doubs$xy, coiner1$lY[, 2])
  par(mfrow = c(1, 1))
}