. Author manuscript; available in PMC: 2022 Sep 6.

Published in final edited form as: Manag Biol Invasion. 2020 Jul 23;11(3):607–632. doi: 10.3391/mbi.2020.11.3.17

Table 3.

“Historic invaders” risk weighting factors applied to each re-scaled spatial surrogate value and used to derive invasion risk index scores based on historic invasion patterns (per the GLANSIS “Nonindigenous + Range Expanders” list). The risk weighting factors were calculated as the proportion of species in each taxonomic group for which introduction has been assigned to a given pathway (s). When more than one pathway is indicated, the weighting is the sum of all pathways combined.

Spatial surrogates	GLANSIS “Nonindigenous + Range expanders” pathways	All taxa	Fish	Inverts	Plants
U.S. Population (2013)	Aquarium release Pet release Stocked Planted	0.37	0.68	0.13	0.47
Shipping vessel trips to port (2004–2013)	Shipping	0.43	0.16	0.67	0.24
Marina size (# of boat slips)	Dispersed Bait release	0.42	0.51	0.27	0.66
Boat launch size (# of parking spaces)	Dispersed Bait release	0.42	0.51	0.27	0.66
Ponds	Aquaculture Planted Stocked	0.29	0.61	0.04	0.39
Canals	Canals	0.17	0.40	0.13	0.12