calc.niche.overlap {ENMeval} | R Documentation |

## Calculate Similarity of ENMs in Geographic Space

### Description

Compute pairwise "niche overlap" in geographic space for Maxent predictions. The value ranges from 0 (no overlap) to 1 (identical predictions). The function uses the `nicheOverlap`

function of the dismo package (Hijmans *et al.* 2011).

### Usage

```
calc.niche.overlap(predictors, overlapStat, quiet = FALSE)
```

### Arguments

`predictors` |
RasterStack: at least 2 Maxent raster predictions |

`overlapStat` |
character: either "D" or "I", the statistic calculated by the |

`quiet` |
boolean: if TRUE, silence all function messages (but not errors) |

### Details

"D" refers to Schoeners *D* (Schoener 1968), while "I" refers to the *I* similarity statistic from Warren *et al.* (2008).

### Value

A matrix with the lower triangle giving values of pairwise "niche overlap" in geographic space. Row and column names correspond to the results table output by `ENMevaluate()`

.

### Author(s)

Based on dismo::`nicheOverlap`

, which is based on SDMTools::`Istat`

Robert Muscarella <bob.muscarella@gmail.com>

### References

Hijmans, R. J., Phillips, S., Leathwick, J. & Elith, J. (2011) dismo package for R. Available online at: https://cran.r-project.org/package=dismo.

Schoener, T. W. (1968) The *Anolis* lizards of Bimini: resource partitioning in a complex fauna. *Ecology*, **49**: 704-726. doi:10.2307/1935534

Warren, D. L., Glor, R. E., Turelli, M. & Funk, D. (2008) Environmental niche equivalency versus conservatism: quantitative approaches to niche evolution. *Evolution*, **62**: 2868-2883. doi:10.1111/j.1558-5646.2008.00482.x

### See Also

'nicheOverlap' in the dismo package

*ENMeval*version 2.0.4 Index]