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This non-native species list consists of 11,344 unique taxa established in Alaska, Hawaii, the conterminous United States, or a combination of these regions. 157 taxa are established in all 3 regions and 1,166 authoritative sources were consulted to generate the list.

Our findings reinforce three common ideas: that tropical island systems (in this case, Hawaii) are particularly vulnerable to biological invasions; that higher latitudes (in this case, Alaska) host fewer non-native species but are not invulnerable to future invasions; and that species diversity in general decreases with increasing latitude.

Uses for the list include contributing to the measurement of Essential Biodiversity Variables for invasive species monitoring, measuring gaps in coverage within species occurrence databases, providing species references for early detection and rapid response, and assisting with prioritizing species incursions.

The non-native species list was also used to expose non-native occurrence records in BISON, an all-species mapping application that has more than 464 million native and non-native species occurrence records (as of May 2019). By tagging BISON’s non-native occurrences, it was found that BISON contains about 18 million occurrence records for non-native taxa, many of which were not labeled as non-native by the data providers of the records.

Science Support Framework Category: Data Management

Author(s): Annie Simpson ( - USGS Science Analytics & Synthesis Program, and Meghan C. Eyler ( - Natural Systems Analysts Inc.

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