Point density map of non-native species records at five different time intervals. High-density values were associated with 100 or more records within a 75 km circular neighborhood around each individual record. Records were cumulative for each respective interval and tallied on the right side of each map. Time series data associated with new species and records shown in bottom right.

  Part of: Gladstone NS, Bordeau TA, Leppanen C, McKinney ML (2020) Spatiotemporal patterns of non-native terrestrial gastropods in the contiguous United States. NeoBiota 57: 133-152. https://doi.org/10.3897/neobiota.57.52195