mvabund (version 3.11.9)

spider: Spider data

Description

data from spider2 directory, CANOCO FORTRAN package.

Usage

data(spider)

Arguments

Format

A list containing the elements
abund
A data frame with 28 observations of abundance of 12 hunting spider species
x
A matrix of six (transformed) environmental variables at each of the 28 sites.
The data frame abund has the following variables
Alopacce
(numeric) Abundance of the species Alopecosa accentuata
Alopcune
(numeric) Abundance of the species Alopecosa cuneata
Alopfabr
(numeric) Abundance of the species Alopecosa fabrilis
Arctlute
(numeric) Abundance of the species Arctosa lutetiana
Arctperi
(numeric) Abundance of the species Arctosa perita
Auloalbi
(numeric) Abundance of the species Aulonia albimana
Pardlugu
(numeric) Abundance of the species Pardosa lugubris
Pardmont
(numeric) Abundance of the species Pardosa monticola
Pardnigr
(numeric) Abundance of the species Pardosa nigriceps
Pardpull
(numeric) Abundance of the species Pardosa pullata
Trocterr
(numeric) Abundance of the species Trochosa terricola
Zoraspin
(numeric) Abundance of the species Zora spinimana
The matrix x has the following variables
soil.dry
(numeric) Soil dry mass
bare.sand
(numeric) Cover bare sand
fallen.leaves
(numeric) Cover fallen leaves / twigs
moss
(numeric) Cover moss
herb.layer
(numeric) Cover herb layer
reflection
(numeric) Reflection of the soil surface with a cloudless sky
These variables have already been log(x+1)-transformed.

Source

Data attributed to van der Aart & Smeenk-Enserink (1975), obtained from the spider2 directory, CANOCO FORTRAN package.

Details

The abundance of each species was measured as a count of the number of organisms in the sample.

References

ter Braak, C. J. F. and Smilauer, P. (1998) CANOCO reference manual and user's guide to CANOCO for Windows: software for canonical community ordination (version 4). Microcomputer Power, New York, New York, USA.

van der Aart, P. J. M., and Smeenk-Enserink, N. (1975) Correlations between distributions of hunting spiders (Lycos- idae, Ctenidae) and environmental characteristics in a dune area. Netherlands Journal of Zoology 25, 1-45.

Examples

Run this code
require(graphics)

data(spider)
spiddat <- as.mvabund(spider$abund)

plot(spiddat)

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