bipartite (version 0.7)

visweb: Plotfunction to visualize a bipartite foodweb

Description

this function draws a foodweb as a grid using a matrix. colnames and rownames are used as labels and entries in the matrix are visualized by text and colours

Usage

visweb(web, type="nested",  prednames=TRUE, preynames=TRUE, labsize=1,
  plotsize=12, square="interaction", text="compartment", frame=NULL, textsize=1,
  textcol="red", pred.lablength=NULL, prey.lablength, clear=TRUE )

Arguments

web

A matrix representing the interactions observed between higher trophic level species (columns) and lower trophic level species (rows). Usually this will be number of pollinators on each species of plants or number of parasitoids on each species of prey.

type

type changes the sorting of rows and coloumns of the web and can be nested: (sorted by row/colSums) diagonal: (highest number of interactions appear along the diagonal, good for showing compartments) none: (as is)

prednames

labels can be switched of by prednames=F

preynames

labels can be switched of by preynames=F

labsize

factor for size of labels

plotsize

size of plot (length of width or height), depending on the dimension of the web in cm, default is 12 cm.

square

square is used to indicate number of interactions and belonging to compartments by coloured grid cells interaction: (level of grey indicates the number of intercation, white means no interaction) compartment: (level of grey indicates belong

text

number of interactions or belonging are plotted into each grid cell interaction: (number of interactions are drawn) compartment: (belonging to same compartment indicated by capitel Letters) none: (no text is shown)

frame

a frame is drawn around each compartment (frame=T), best used with type=diagonal

textsize

factor for size of text in squares, default=1

textcol

color of text in grid cells, default =red

pred.lablength

length of predators (upper) labels that should be displayed

prey.lablength

length of prey (lower) labels that should be displayed

clear

delete species with no interactions (compulsory done for nested and diagonal)

Value

• A plot window with appropriate size according to the dimensions of the web.

References

... have to find appropriate ones

See Also

For a different plot on foodweb see plotweb

Examples

data(Safariland)
visweb(Safariland)
visweb(Safariland, type="diagonal", square="compartment", text="none", frame=TRUE)