Tools to fit probability distributions to species abundance distributions (SADs) and species rank-abundance distributions (RADs) using maximum likelihood.
| Package: | sads |
| Type: | Package |
| Version: | 0.3.1 |
| Date: | 2016-05-12 |
| License: | gpl |
| LazyLoad: | yes |
The distribution of abundances of species is one of the basic patterns of ecological communities. The empirical distributions of abundances (SADs) or their ranks (RADs) are traditionally modelled through probability distributions. Hence, the maximum likelihood method can be used to fit and compare competing models for SADs and RADs. The sads package provides functions, classes and methods to:
Fit classic SAD models: log-series, lognormal, broken-stick, … ;
Fit classic rank-abundance (RADs) models: geometric, broken-stick, Zipf, Zipf-Mandelbrodt, … ;
Tools for quick diagnostic and comparison of models;
Tools to simulate Poisson and Negative Binomial samples from abundances in communities.
Magurran, A.E. 2004. Measuring Biological Diversity. Blackwell.
Magurran, A.E. and McGill, B.J. 2011. Biological Diversity -- Frontiers in measurement and assessment. Oxford University Press.
May, R.M. 1975. Patterns of Species Abundance and Diversity. In M. L. Cody and J. M. Diamond (Eds.), (pp. 81--120). Harvard University Press.
Green,J. and Plotkin, J.B. 2007 A statistical theory for sampling species abundances. Ecology Letters 10:1037--1045.
vignettes of sads; vegan-package and poilog-package