Isotope-space Niche Width Metrics
Calculates the 6 metrics for trophic niche width as described by Layman et al. 2007.
laymanmetrics(x,y)
x,y |
Bivariate data given as vectors x and y |
dN_range |
Assuming y is delta Nitrogen, then dN_range is the max(delta N |
- min(delta N)
dC_range |
Assuming x is delta Nitrogen, then dN_range is the max(delta N |
- min(delta N)
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 |
Andrew Jackson
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.
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.