The US Geological Survey’s Nonindigenious Aquatic Species (NAS) program has monitored, recorded, and analysed occurrences of alien freshwater organisms in the United States since the 1980s. The records draw from a number of sources, including 12,000 records from the GBIF network, all maintained in a publicly accessible online database where users can search, display and map species by state, temporal range or other variables. The database has been used in a number of different studies, and distribution maps have appeared in many publications and news outlets. USGS also publishes the 260,000 records of the NAS database as a dataset on GBIF.org.
The U.S. Geological Survey's Nonindigenous Aquatic Species Database: over thirty years of tracking introduced aquatic species...
- Fuller, P., Neilson, M. E. (2015). The U.S. Geological Survey’s Nonindigenous Aquatic Species Database: over thirty years of tracking introduced aquatic species in the United States (and counting). Management of Biological Invasions, 6(2), 159–170. doi:10.3391/mbi.2015.6.2.06
- Robert S. Powell. 2016. Glandirana rugosa. USGS Nonindigenous Aquatic Species Database, Gainesville, FL. Revision Date: 8/17/2015 (link)