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tRophicPosition is a colaborative project of Chris Harrod, Andrew L. Jackson, Claudio Quezada-Romegialli and others. It consists of an R package incorporating a Bayesian model for the calculation of consumer trophic position using stable isotopes with one or two baselines. It uses the powerful approach of Markov Chain Monte Carlo simulations provided by JAGS and the statistical language R.

As of 29th of January 2018, we are releasing the version 0.7.5 of the package, the fourth release version. If you find any error, please send it to and/or raise an issue in the GitHub page. Also you can also send a direct email to clquezada at

If you are interested in joining the tRophicPosition support group, do it at

NEWS (29 January 2018)

NEWS (12 October 2017)


The stable version of tRophicPosition is hosted on CRAN, and is installed like any other package:


Remember to install JAGS for your platform as well.

The development version of tRophicPosition must be installed from GitHub. For this, install the package devtools, and then use the function install_github():

devtools::install_github("clquezada/tRophicPosition", build_vignettes = TRUE)

And then see the vignettes we have prepared to describe how to use the package:


Online vignettes

Can be found in GitHub here.


tRophicPosition relies on some code from coda and dispRity. At the moment dispRity is only available through GitHub, so it is not included in Suggests. tRophicPosition included the Bhattacharrya Coefficient (bhatt.coeff function from dispRity) and plotMCMC (from coda) for convenience.


While the paper describing tRophicPosition is not published (currently under revision at MEE), to cite the package in publications please use:

Claudio Quezada-Romegialli, Andrew L Jackson and Chris Harrod (2018). tRophicPosition: Bayesian Trophic Position Calculation with Stable Isotopes. R package version 0.7.5. doi:10.5281/zenodo.1161826

For previous releases please use the corresponding version and doi when citing:

Future releases and how to get support

You are encouraged to use tRophicPosition with your own data, test the package and see if there are any issues or problems. You can send your questions or commentaries to the google group tRophicPosition-support or directly to the email trophicposition-support at You can send your questions to or even Facebook (stable isotope ecology group).

We are constantly working on future releases of tRophicPosition, so feedback is very much appreciated.


Things to do in tRophicPosition