Data and Source Code From: Nitrogen Uptake and Allocation Estimates for Spartina Alterniflora and Distichlis Spicata

Contains data, code, and figures from Hill et al. 2018a (Journal of Experimental Marine Biology and Ecology; ) and Hill et al. 2018b (Data In Brief ). Datasets document plant allometry, stem heights, nutrient and stable isotope content, and sediment denitrification enzyme assays. The data and analysis offer an examination of nitrogen uptake and allocation in two salt marsh plant species.

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This repository contains data and source code associated with two companion manuscripts:

  • Troy D. Hill, Nathalie R. Sommer, Caroline R. Kanaskie, Emily A. Santos, Autumn J. Oczkowski. 2018. "Nitrogen uptake and allocation estimates for Spartina alterniflora and Distichlis spicata." Journal of Experimental Marine Biology and Ecology 507:53-60.
  • Troy D. Hill, Nathalie R. Sommer, Caroline R. Kanaskie, Emily A. Santos, Autumn J. Oczkowski. In Press. "Nitrogen and carbon concentrations and stable isotope ratios: Data from a 15N tracer study in short-form Spartina alterniflora and Distichlis spicata." Data In Brief.

Install the package

Install our R package directly from CRAN using the following commands in the R console:


Read our manuscripts

After loading the NitrogenUptake2016 package, the manuscript vignettes are available as pdfs:

# Journal of Experimental Marine Biology and Ecology manuscript
vignette(package = "NitrogenUptake2016", topic = "JEMBE")
# Data In Brief manuscript
vignette(package = "NitrogenUptake2016", topic = "DataInBrief")

Access our data

All the data used in our manuscripts are also available and annotated:


License and disclaimer

License: GPL v3

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see

EPA disclaimer: This project code is provided on an "as is" basis and the user assumes responsibility for its use. The authors have relinquished control of the information and no longer have responsibility to protect the integrity, confidentiality, or availability of the information. Any reference to specific commercial products, processes, or services by service mark, trademark, manufacturer, or otherwise, does not constitute or imply their endorsement, recommendation or favoring by EPA. The EPA seal and logo shall not be used in any manner to imply endorsement of any commercial product or activity by EPA or the United States Government.


This effort to support open science benefitted significantly from the example set by Jeff Hollister et al.'s LakeTrophicModelling manuscript.


NitrogenUptake2016 version 0.2.3 (release date: 2018-10-28)


  • Data In Brief manuscript accepted; citations added and vignette manuscript updated after page proof corrections

NitrogenUptake2016 version 0.2.2 (release date: 2018-09-23)


  • JEMBE manuscript citation updated (added DOI, volume, pages)
  • JEMBE and Data In Brief vignettes now produce pdfs

Reference manual

It appears you don't have a PDF plugin for this browser. You can click here to download the reference manual.


0.2.3 by Troy D. Hill, 3 months ago

Browse source code at

Authors: Troy D. Hill , Nathalie R. Sommer , Caroline R. Kanaskie , Emily A. Santos , and Autumn J. Oczkowski

Documentation:   PDF Manual  

GPL-3 license

Depends on zoo, car, MASS

Suggests knitr, rmarkdown, plyr, reshape2, ggplot2, scales, MuMIn, rsq

See at CRAN