I would like to announce the availability of a new R package, called qfasar, for diet estimation using quantitative fatty acid signature analysis (QFASA), a popular method in studies of marine species. The package provides basic functionality to estimate diet composition in typical QFASA studies. In addition, the package provides advanced functionality to evaluate and improve diet estimation, diagnose estimation problems, and support simulation-based research. The package makes traditional QFASA methods and analytical techniques drawn from our four methodology papers published in 2015 and 2016 easily accessible to ecologists for the first time. The package is available on the CRAN website (https://cran.r-project.org/web/packages/qfasar/) and as a USGS Alaska Science Center software tool (https://dx.doi.org/10.5066/F71G0JC9). Regards, Jeff ----------------------------------------------- Jeffrey F. Bromaghin, PhD Research Statistician USGS Alaska Science Center Marine Ecosystems Office 4210 University Drive Anchorage, AK 99508 907-786-7086 jbromaghin@usgs.gov <https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=jbromaghin@usgs.gov> *http://alaska.usgs.gov/science/biology/quantitative_ecology/index.php <http://alaska.usgs.gov/science/biology/quantitative_ecology/index.php>*