Invasive species are one of the leading global conservation concerns because they can have strong, negative impacts on ecosystems, native species, and natural resources. To date, arctic regions have experienced a relatively low number of biological introductions. However, increases in water temperatures, reductions in sea ice, and projected increases in shipping traffic are expected to make arctic marine regions more susceptible to the arrival and colonization of new species.

Our risk assessment for the Bering Sea sought to identify 1) which marine species pose the greatest invasion risk; 2) which areas are most vulnerable to invasion; and 3) which ports are most likely to serve as an entry point into the Eastern Bering Sea.

As part of this project, we created suitability maps using downscaled climate models and species' temperature and salinity thresholds. For each species, we evaluated a) the number of weeks with suitable survival habitat; b) whether each species could survive year-round; c) the number of consecutive weeks with suitable reproductive habitat. We conducted these analyses for two, 10-year study periods: current (2003-2012) and future (2030-2039).

About the data
Our dataset, including physiological thresholds and predicted suitability results for each species, can be found on our KNB data repository. Suitability maps are also available as a .pdf.

Acknowledgements
This project was made possible through funding from the North Pacific Research Board (project #1523) and the Aleutian and Bering Sea Islands LCC. Tracey Gotthardt and Aaron Poe were involved with spearheading the project. Tracey Gotthardt and Aaron Poe were instrumental in developing this project. Casey Greenstein, Lindsey Flagstad, Catie Bursche, Jaime Weltfelt, and Curtis Whisman contributed to developing the ranking system and the species status reports. Thank you to Jen Karnak of Marine Exchange of Alaska, who assisted with vessel identification, Rob Bochenek and Dr. William Koeppen of Axiom Data Science for assistance extracting the ROMS data, Marcus Geist for his GIS wizarding, and Dr. Al Hermann for insightful conversations about the ROMS.