est_brc: Estimate Biotic Response Curves (BRC).

In ngwalton/iec: Index of Ecological Condition (IEC)

Description

est_brc generates biotic response curves (BRC) for each species or taxon in sp in relation to environmental reference gradient ref_grad.

Usage

est_brc(sp, ref_grad)

Arguments

sp	community data frame (sites as rows, taxa as columns, observations as values).
ref_grad	numeric vector of reference gradient scores (0-10), one for each site.

Details

The Biotic Response Curves or functions returned by est_brc are normal curves fit to the observations in sp using a lack-of-fit (LOF) criteria. BRCs consist of a normal curve defined by mean (mu) and standard deviation (sigma), which is multiplied (scaled) a height factor (H). The reference gradient (ref_grad) input to est_brc must be a numeric vector scaled to 0-10 where 10 represents the least impacted site. Use scale10 to scale the reference gradient if needed. Note that ref_grad must have the same order by site as sp. The results of est_brc are used to give sites an Index of Ecological Condition score using function est_iec.

Value

A data frame defining BRCs for each species or other taxa in sp.

References

Gnass Giese, E.E., R.W. Howe, A.T. Wolf, N.A. Miller, and N.G. Walton. 2015. Sensitivity of breeding birds to the "human footprint" in western Great Lakes forest landscapes. Ecosphere 6(6):90. http://dx.doi.org/10.1890/ES14-00414.1

Howe, R.W., R. R. Regal, J.M. Hanowski, G.J. Niemi, N.P. Danz, and C.R. Smith. 2007a. An index of ecological condition based on bird assemblages in Great Lakes coastal wetlands. Journal of Great Lakes Research 33 (Special Issue 3): 93-105.

Howe, R.W., R. R. Regal, G.J. Niemi, N.P. Danz, J.M. Hanowski. 2007b. A probability-based indicator of ecological condition. Ecological Indicators 7:793-806.

See Also

scale10

ngwalton/iec documentation built on May 23, 2019, 4:43 p.m.