bipartite (version 2.23)

sortweb: Function to sort bipartite webs

Description

This function sorts bipartite webs by either increasing/decreasing row and column totals or by a given sequence

Usage

sortweb(web, sort.order = "dec", empty = TRUE, sequence = NULL)

Value

Returns a sorted bipartite web.

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.

sort.order

sort.order can be either

• "inc": sorted by increasing row/column totals

• "dec": sorted by decreasing row/column totals

• "seq": sorted by a given order, see sequence for how to specify an order

• "ca": performs a correspondence analysis (ca) on the web

empty

If TRUE empty columns and rows are removed from the web.

sequence

list of two with two named vectors: seq.lower and seq.higher, which specify the order in which species are sorted. To be able to sort by names obviously the given web must be a NAMED matrix, i.e. has column and row names. If you want to order an unnamed web, you can either order it by row/column totals are you have to simply specify the sequence as follows (example puts last row/column to the front): web[c(9, 1:8), c(27, 1:26)]

Author

Bernd Grube & Jochen Fründ

References

Vázquez, P.D., Chacoff, N.,P. and Cagnolo, L. (2009) Evaluating multiple determinants of the structure of plant-animal mutualistic networks. Ecology in press.

See Also

For plotting and ordered web see plotweb, method="normal" or visweb, type="none".

Examples

data(Safariland)
web <- Safariland

sortweb(Safariland, sort.order = "dec") 

# sorted by a given (here random) sequence
sequence <- list(seq.higher = sample(colnames(Safariland)), 
	seq.lower = sample(rownames(Safariland)))
web.ordered <- sortweb(web, sort.order = "seq", sequence = sequence)