View source: R/calcTopologicalIndices.r

calc_incoherence | R Documentation |

The incoherence index is based in how the species fit in discrete trophic levels when Q is closer to 0 more coherent and stable is a food web, and the less omnivory it has. It calculates the trophic level using the package NetIndices.

```
calc_incoherence(ig, ncores = 0)
```

`ig` |
an igraph object or a list of igraph objects |

`ncores` |
number of cores used to compute in parallel, if 0 sequential processing is used. |

Based on:

a data.frame with the following fields

`Q` |
incoherence (0=coherent) |

`rQ` |
ratio of Q with expected Q under null expectation of a random network given N=nodes L=links B=basal nodes Lb=basal links |

`mTI` |
mean trophic level |

`rTI` |
ratio of mTI with expected TI under the same null model expectation than Q |

Johnson, S., Domínguez-García, V., Donetti, L., & Muñoz, M. A. (2014). Trophic coherence determines food-web stability. Proceedings of the National Academy of Sciences , 111(50), 17923–17928. https://doi.org/10.1073/pnas.1409077111

Johnson, S., & Jones, N. S. (2017). Looplessness in networks is linked to trophic coherence. Proceedings of the National Academy of Sciences, 114(22), 5618–5623. https://doi.org/10.1073/pnas.1613786114

```
calc_incoherence(netData[[1]])
```

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