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>

This package uses a probabilistic method to calculate niche
regions and pairwise niche overlap 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.  A
forthcoming article by Swanson et al. (Ecology, 2014) provides a detailed
description of the methodology.  See the package vignette for a worked
example using fish stable isotope data.

Martin Lysy

nicheROVER

(Niche) (R)egion and Niche (Over)lap 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.

Description

Arguments

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Details

Examples