ordi.focal.drop: ordi.focal.drop

In ordiBreadth: Ordinated Diet Breadth

Description

This function computes the ordinated host breadth based on ordination where each herbivore is excluded from the ordination.

Usage

ordi.focal.drop(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	Name of herbivore species (row name of dat
ODB	Ordinated diet breadth
ODB.scaled	Scaled ordinated diet breadth
focal.distances	Distance to each diet item from herbivore centroid based on ordination excluding focal herbivore
focal.breadth	Ordinated diet breadth of herbivore based on ordination where focal herbivore is excluded
focal.scale.factor	The ordinated diet breadth of an extreme generalist in the ordinated space when focal herbivore is excluded from the ordination
focal.scale.breadth	Scaled ordinated diet breadth of herbivore based on ordination where focal herbivore is excluded

Author(s)

James Fordyce

References

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

Examples

testdata<-	
	c(		
			0,0,0,0,1,0,0,0,0,0,
			0,0,0,0,0,0,1,1,0,0,
			1,1,1,0,0,0,0,0,0,0,
			0,0,0,0,1,1,0,1,0,1,
			1,1,1,0,0,0,1,0,0,0,
			1,1,0,0,1,0,1,0,0,0,
			0,0,0,1,0,0,1,0,1,1,
			1,0,1,0,1,1,0,0,0,1, 
			1,1,0,0,1,0,0,1,1,1,
			1,1,1,0,1,1,0,1,1,1) 


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.focal.drop(dat)

ordiBreadth documentation built on May 2, 2019, 9:41 a.m.