Non-indigenous estuarine and marine organisms

Abbreviations used:

[B.]: found in the Baltic Sea.
[Oreg.]: found in Other regions
[Exp.]: found in Experimental studies.

Notes:

1. Species links contain full entries
2. Other links include full bibliographic reference(s)
3. For explanation see Database Help

	Gulf of Riga/area of origin: North America
	Gulf of Riga/area of origin: North America

Alien species name	First observed	Taxon	Ecofunctional group	Origin	Vector of introduction	Salinity range in native habitats	Ecological impact
Acartia tonsa	1925	Crustacea	Zooplankton suspension feeders	Indo-Pacific North America	Shipping	Polymixohaline	Benthic-pelagic interaction [B.] Bioacummulation [B., Exp., Oreg.] Community dominance [B., Oreg.] Competition [Oreg.] Food-prey [B., Oreg.] Herbivory [Oreg.]
Balanus improvisus	1844	Crustacea	Benthic suspension feeders	North America	Shipping	Polymixohaline to Euhaline	Benthic-pelagic interaction [B., Exp., Oreg.] Bioacummulation [B.] Community dominance [B., Oreg.] Competition [B.] Food-prey [B.] Habitat change [B.]
Gammarus tigrinus	1975	Crustacea	Nekto-benthic invertebrates	North America	Shipping	Limnetic to Polymixohaline	Bioacummulation [Exp., Oreg.] Community dominance [B.] Competition [B., Oreg.] Food-prey [B., Oreg.] Herbivory [Exp.] Predation [B., Oreg.] Transfer of parasites and diseases [B.]
Marenzelleria neglecta	1985	Polychaeta	Benthic deposit feeders Benthic suspension feeders	North America	Shipping	Polymixohaline to Euhaline	Benthic-pelagic interaction [B.] Community dominance [B., Oreg.] Competition [B., Exp., Oreg.] Food-prey [B.] Habitat change [B.] Predation [B.]
Mya arenaria	1245 **	Mollusca	Benthic suspension feeders	North America	Shipping	Polymixohaline to Euhaline	Benthic-pelagic interaction [B., Exp., Oreg.] Bioacummulation [B.] Community dominance [B., Oreg.] Competition [B., Oreg.] Food-prey [B., Oreg.] Habitat change [B., Exp., Oreg.]

The mark ** next to the year means, that only decade (sometimes even century) is known.