p250 (Nehalem River) Summary

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Taxonomic Group	Name	Year	Invasion Status	Population Status	Vectors
Annelids-Polychaetes	Hediste diadroma	2009	Definite	Established	Hull Fouling, Natural Dispersal
Crustaceans-Amphipods	Grandidierella japonica	1999	Definite	Established	Hull Fouling, Natural Dispersal, Oyster Accidental
Mollusks-Bivalves	Mya arenaria	1954	Definite	Established	Fisheries Intentional
Mollusks-Bivalves	Nuttallia obscurata	1999	Definite	Established	Ballast Water, Fisheries Accidental (not Oyster), Natural Dispersal
Mollusks-Gastropods	Potamopyrgus antipodarum	2011	Definite	Established	Fisheries Accidental (not Oyster), Hull Fouling, Natural Dispersal

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* = Species summary still under review.