prey_avg_tl: Prey-averaged trophic level

In clementviolet/omnivor: Ecological Networks Analysis

Description

Prey-averaged trophic level is calculated as follow :

TL_j = 1 + ∑_{i = 1}{S}l_{ij}\frac{TL_{i}}{n_j}

With :

• TL_j the trophic level of the j specie;

• S the number of species of the trophque chain;

• l_{ij} equal 1 if the specie j consume specie i;

• n_j the number of specie consumed by the specie j.

Usage

prey_avg_tl(graph)

Arguments

graph

an igraph object.

Value

dataframe contening the taxons and the trophic level.

References

Levine, S., 1980. Several measures of trophic structure applicable to complex food webs. Journal of Theoretical Biology

Williams, R.J. & Martinez, N.D., 2004. Limits to Trophic Levels and Omnivory in Complex Food Webs: Theory and Data. The American Naturalist

Examples

data(aleutian)

prey_avg_tl(aleutian)

clementviolet/omnivor documentation built on Aug. 16, 2019, 12:05 a.m.