An implementation of Quantitative Fatty Acid Signature Analysis (QFASA) in R. QFASA is a method of estimating the diet composition of predators. The fundamental unit of information in QFASA is a fatty acid signature (signature), which is a vector of proportions describing the composition of fatty acids within lipids. Signature data from at least one predator and from samples of all potential prey types are required. Calibration coefficients, which adjust for the differential metabolism of individual fatty acids by predators, are also required. Given those data inputs, a predator signature is modeled as a mixture of prey signatures and its diet estimate is obtained as the mixture that minimizes a measure of distance between the observed and modeled signatures. A variety of estimation options and simulation capabilities are implemented. Please refer to the vignette for additional details and references.

Documentation

Manual: qfasar.pdf
Vignette: qfasar

Maintainer: Jeffrey F. Bromaghin <jbromaghin at usgs.gov>

Author(s): Jeffrey F. Bromaghin*

Install package and any missing dependencies by running this line in your R console:

install.packages("qfasar")

Depends
Imports Rsolnp(>=1.16)
Suggests knitr, rmarkdown, testthat
Enhances
Linking to
Reverse
depends
Reverse
imports
Reverse
suggests
Reverse
enhances
Reverse
linking to

Package qfasar
Materials
URL
Task Views
Version 1.2.0
Published 2017-01-10
License Unlimited
BugReports
SystemRequirements
NeedsCompilation no
Citation
CRAN checks qfasar check results
Package source qfasar_1.2.0.tar.gz