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Appendix S1. Hull-fouling invertebrate specimens identified to species. Sampling port: H= Halifax, V= Vancouver, HV= both. Habitat: M= marine, E= estuarine, F= freshwater, B= brackish water. Invasive status: E-NIS= established NIS; NE-NIS= non-established NIS; NIS= nonindigenous species. Invasive status is indicated only for taxa found in each port. Where necessary, the port where live specimens were found is indicated in parentheses.

Appendix S2. Hull-fouling specimens not identified to species. NIS= taxon has NIS, NE-taxa= non-established taxa; rest of the codes as per Appendix 1.

Appendix S3. Supplementary information on hull fouling communities and vessels sampled in the ports of Halifax and Vancouver. Coast codes for vessels: EC= east coast, WC= west coast.

Appendix S4. Plot of observed values vs. values predicted by process models of gains and losses for sampled species richness (a), number of individuals (b), and number of individuals ship−1 (c). Species r2= 0·43, individuals r2= 0·26, and individuals ship−1 r2= 0·86; the last model was not predictive for 31 of 39 points which did not follow the overall pattern.

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