ordiBreadth (version 1.0)

ordi.breadth: ordi.breadth

Description

This function calculates ordinated diet breadth

Usage

ordi.breadth(dat, dist.method = "jaccard")

Arguments

dat

A matrix of diet associations. Rows are herbivores and columns are diet items.

dist.method

Dissimilarity index passed on to vegdist in the vegan package.

Value

A list containing the following

species

A vector of the herbivore species names (row names of dat)

eig

The eigen values for each of the PCo axes

tot.breadth

A vector of the raw ordinated host breadth for each species

scaled.breadth

A vector of the scaled ordinated host breadth for each species

distances

A list of vectors giving the distance of each diet item from the centroid of each herbivore

group.vectors

A matrix of logicals indicating diet items (columns) for each herbivore (rows)

centroids.group

A matrix giving the centroid on PCo (columns) for each herbivore (rows)

plants.ord

A matrix of the coordinates for each plant in PCoA space

dist.method

Dissimilarity index used for PCoA

References

Fordyce, J.A., C.C. Nice, C.A. Hamm, & M.L. Forister. Quantifying diet breadth through ordination of host association. Ecology

See Also

summaryhbreadth

Examples

testdata<-	
	c(		
			0,0,0,0,1,0,0,0,0,0,#1
			0,0,0,0,0,0,1,1,0,0,#2
			1,1,1,0,0,0,0,0,0,0,#3
			0,0,0,0,1,1,0,1,0,1,#4
			1,1,1,0,0,0,1,0,0,0,#4
			1,1,0,0,1,0,1,0,0,0,#4
			0,0,0,1,0,0,1,0,1,1,#4
			1,0,1,0,1,1,0,0,0,1, #5
			1,1,0,0,1,0,0,1,1,1,#6
			1,1,1,0,1,1,0,1,1,1) #8


dat<-array(dim=c(10,10),data=testdata)
dat<-t(dat)
colnames(dat)<-paste("",LETTERS[1:10],sep="")
rownames(dat)<-paste("bug",1:10,sep="")


ordi.breadth(dat)