Our ranking system evaluates the potential threat of non-native taxa to the Bering Sea. Each species is evaluated and scored independently following an in-depth literature review. Overall scores can range from 0 (least threat) to 100 (highest threat). The system contains 33 questions grouped into 5 categories. A score is calculated for each question based on the response selected. The ranking system can account for missing data by calculating the final score based only on known answers. We evaluated a total of 46 taxa that occur in the Bering Sea and nearby marine ecoregions.
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