metacapa: Metapopulation Capacity

In metapop: Metapopulations and Incidence Functions

Description

Metapopulation capacity is the ability of the landscape to sustain a metapopulation.

Usage

metacapa(d, A, alpha = 1, ...)
## S3 method for class 'metacapa'
plot(x, locations = NULL, cex = 4, ...)

Arguments

d	Distances among patches
A	Sizes of patches
alpha	Decay parameter of the exponential connectivity equation
x	metacapa result object
locations	Locations of patches. If missing, the locations are found from metric scaling of distances.
cex	Character expansion factor for the largest dot; the other dots are scared proportional to the patch area.
...	=ther parameters to the functions

Details

Metapopulation capacity is defined as the largest eigenvalue of matrix with non-diagonal elements A_i \exp(-α d_{ij} A_j and zero diagonal.

Value

Function returns a list of class "metacapa" with following items:

capacity	Metapopulation capacity
x	contributions of patches to the metapopulation capacity
d	distances among patches
A	size of patches

Author(s)

Jari Oksanen

References

Hanski, I. & Ovaskainen, O. 2000. The metapopulation capacity of fragmented landscape. Nature 404: 755–758.

See Also

nothing yet

Examples

data(fritty)
attach(fritty)
d <- dist(cbind(x.crd, y.crd))
sol <- metacapa(d, A)
plot(sol)

metapop documentation built on May 2, 2019, 6:50 p.m.