bioGeoIsl {EcoVirtual}

Island Biogeographical Model

Description

Simulates island biogeographical models, with rates of colonization and extinction for islands of different sizes and distances to the mainland.

Usage

bioGeoIsl(area, dist, P, weight.A = 0.5, a.e = 1, b.e = -0.01, c.i = 1,
  d.i = -0.01, e.i = 0, f.i = 0.01, g.e = 0, h.e = 0.01)

Arguments

area

a vector with the sizes of the island areas. It must have the same length as 'dist'

dist

a vector with the distances of the islands to the mainland. It must have the same length as 'areas'

P

the number of species in the mainland (species richness of the pool).

weight.A

ratio between the area and distance effects. Should be a number between 0 to 1. When the ration is 1 the extinction is only affected by size and colonization only by distance. The default ratio is 0.5, meaning that distance and size equally influence colonization and extinction.

a.e

basal extiction coefficient for area.

b.e

extinction/area coefficient.

c.i

basal colonization coefficient for distance.

d.i

numeric, colonization/distance coefficient.

e.i

basal colonization coefficient for area.

f.i

colonization/area coefficient.

g.e

basal extinction coefficient for distance.

h.e

extinction/distance coefficient.

Value

'bioGeoIsl' returns a graph with the rates of colonization and extinction in relation with the species richness for each island.

'bioGeoIsl' also returns a invisible data frame with the values for area, distance and species richness (S) for each island.

Author(s)

Alexandre Adalardo de Oliveira [e-mail]

References

Gotelli, N.J. 2008. A primer of Ecology. 4th ed. Sinauer Associates, 291pp.

See Also

animaColExt archip, http://ecovirtual.ib.usp.br

Examples

## Not run: 
bioGeoIsl(area=c(5,10,50,80), dist=c(10,100,100,10), P=100, weight.A=.5, a=1, 
b=-0.01, c=1, d=-0.01, e=0, f=.01, g=0, h=.01)

## End(Not run)