cheddar (version 0.1-639)

LumpTrophicSpecies: Lump trophic species

Description

Lump trophic species.

Usage

LumpTrophicSpecies(community, include.isolated=TRUE, title=NULL, ...)

Value

A Community.

Arguments

community

an object of class Community.

include.isolated

if TRUE then nodes for which IsIsolatedNode is TRUE are given their own trophic species number. If FALSE the isolated species are assigned a trophic species of NA.

title

the title of the new Community.

...

other parameters to LumpNodes.

Author

Lawrence Hudson

Details

Aggregates nodes that share identical sets of prey and predators.

References

Briand, F and Cohen, J.E. 1984 Community food webs have scale-invariant structure Nature 307, 264--267.

Jonsson, T. and Cohen, J.E. and Carpenter, S. R. 2005 Food webs, body size, and species abundance in ecological community description. Advances in Ecological Research 36, 1--84.

Pimm, S.L. and Lawton, J.H. and Cohen, J.E. 1991 Food web patterns and their consequences Nature 350, 669--674.

Williams, R.J. and Martinez, N.D. 2000 Simple rules yield complex food webs 404, 180--183.

See Also

TrophicSpecies, LumpNodes, IsIsolatedNode

Examples

data(TL84)
NumberOfNodes(TL84)

TL84.lumped <- LumpTrophicSpecies(TL84)

length(unique(TrophicSpecies(TL84)))    # 22 trophic species in TL84...
NumberOfNodes(TL84.lumped)              # ... and 22 nodes in the lumped web