laymanmetrics: Isotope-space Niche Width Metrics

In AndrewLJackson/siar: Stable Isotope Analysis in R

Description

Calculates the 6 metrics for trophic niche width as described by Layman et al. 2007.

Usage

laymanmetrics(x,y)

Arguments

x,y	Bivariate data given as vectors x and y

Value

dN_range

Assuming y is delta Nitrogen, then dN_range is the max(delta N

- min(delta N)

dC_range

Assuming x is delta Carbon, then dC_range is the max(delta C

- min(delta C)

hull	Contains the area of the convex hull around the data points defined by x and y (hull$TA); the coordinates for plotting of the convex hull (hull$xcoords, hull$ycoords); and the index address of the points in x and y which define the convex hull (hull$chI)
CD	Mean distance to centroid
MNND	Mean Nearest Neighbour Distance
SDNND	Standard Deviation of the Nearest Neighbour Distance

Author(s)

Andrew Jackson

References

Layman, C. A., D. A. Arrington, et al. (2007). Can stable isotope ratios provide for community-wide measures of trophic structure? Ecology 88(1): 42-48.

AndrewLJackson/siar documentation built on May 5, 2019, 5:59 a.m.