fish

<p>A dataset containing values for three stable isotopes measured in the muscle tissue of four species of arctic fish. For use in examples.</p>

datasets

Implementation of a probabilistic method to calculate 'nicheROVER' (_niche_ _r_egion and niche _over_lap) metrics using multidimensional niche indicator data (e.g., stable isotopes, environmental variables, etc.). The niche region is defined as the joint probability density function of the multidimensional niche indicators at a user-defined probability alpha (e.g., 95%).  Uncertainty is accounted for in a Bayesian framework, and the method can be extended to three or more indicator dimensions.  It provides directional estimates of niche overlap, accounts for species-specific distributions in multivariate niche space, and produces unique and consistent bivariate projections of the multivariate niche region.  The article by Swanson et al. (Ecology, 2015) provides a detailed description of the methodology.  See the package vignette for a worked example using fish stable isotope data.

Martin Lysy

nicheROVER

Niche Region and Niche Overlap Metrics for Multidimensional
Ecological Niches

Ashley D. Stasko

Heidi K. Swanson

fish function

<p>A data frame with 278 rows (observations) and 4 columns (species, delta^15N, delta^13C, and delta^34S).</p>

fish: Fish stable isotope dataset.

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Examples