Metapopulation Capacity

Description

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

Usage

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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

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

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