DAAGxtras (version 0.8-4)

fishRivers: Characteristics of river reference sites

Description

Data on river sites was matched with data on fish caught at nearby fishing sites. Fishing sites were classified according to type of fish (Group = fish river type).

Usage

data(fishRivers)

Format

A data frame with 128 observations on the following 23 variables.

Group

Fish river types; a factor with levels F1 F2 F3 F4 F5 F6

Alk

mgm/l of CaCO3

Avrain

mean annual rainfall, mm

Bedrock

% cover on river edge attached to substratum

Boulder

numeric, % cover of stones $>$ 200mm diameter

Cobble

numeric, % cover of stones between 60 \& 200mm

Cond

electrical conductivity ($mu S/cm$)

Dis

maximum distance from source (m)

DO

numeric, dissolved O2, % saturation

Elev

nearest contour line (m) below site

Fine

numeric, % cover of particles $<$ 0.02mm<="" dd="">

Gravel

numeric, % cover of particles between 2 \& 20mm

Lat

latitude

Long

longitude

NoxN

total oxidised Nitrogen (mgl/l)

Pebble

numeric, % cover of stones between 20 \& 60mm

Ph

a numeric vector

Sand

numeric, % cover of particles between 0.02 \& 2mm

Slope

numeric, elevatioon difference (m) between site \& a point 1km upstream

Tkn

total Kjeldahl Nitrogen (mgl/l)

Tpl

total Phosphorus (mgl/l)

Turb

turbidity (NTU)

Width

modal river width (m), assessed visually

Source

Data relate to Turak and Koop (2007).

Details

To what extent can the fish river type be predicted, based on: (i) all explanatory variables; (ii) the variables Avrain, Dis, Elev, Lat, Long and Slope. The second set comprises the variables that would be used in practice to predict the fish river type at other sites.

References

Turak, E and Koop, K. Multi-attribute ecological river typology for assessing ecological condition and conservation planning. Hydrobiologica 603:83-104, 2007.

Examples

data(fishRivers)
library(MASS)
fish.lda <- lda(Group ~ Avrain + Dis +Elev + Lat + Long + Slope,
               data=fishRivers)