linklevel {bipartite}

Indices of a bipartite network at the link level

Description

Computes various indices of a network at the link-level, i.e. for each cell of the network matrix

Usage

linklevel(web, index=c("dependence", "endpoint"))

Arguments

web

A matrix with pollinators as columns and plants as rows. Alternatively, when used on e.g. species occurrences across islands, rows are islands.

index

Vector of indices to be computed at the link level; options are:

• dependence to compute dependence-matrix for each group level;

• endpoint to compute end-point degrees following Barratt et al. (2004).

Details

For summaries of such indices see networklevel. It's still early days for this function ...

Value

Returns a list of indices, each entry being a matrix of the same dimensions as the input web.

Note

This function aims to facilitate analyses at the link level. So far, most studies at this level did not correct for the fact that observations per cell are clearly non-independent, nor for the abundances of the species, which also greatly affect indices. Room for improvement, but little room for new findings ...

Author(s)

Carsten F. Dormann [e-mail]

References

Barrat, A., Barthélemy, M., Pastor-Satorras, R. & Vespignani, A. (2004) The architecture of complex weighted networks. Proceedings of the National Academy of Sciences of the USA 101, 3747-–3752

See Also

endpoint, specieslevel

Examples

data(Safariland)
linklevel(Safariland)