Invasion
Invasion Description
1st Record: Island of Fyn/Denmakr/Odense Fjord (2002, Kristensen et al. 2011, now abundant)
Geographic Extent
Island of Fyn/Denmark/Odense Fjord (2002, Quintana et al. 2007; Kristensen et al. 2011, now abundant); Denmark/Mariager Fjord, Kattegatt (2010, Delefosse et al. 2012); Denmark/Vejle Fjord, Kattegatt (2010, Delefosse et al. 2012); Denmark/Sejerøbugten, Kattegatt (2010, Delefosse et al. 2012)
Vectors
| Level | Vector |
|---|---|
| Alternate | Ballast Water |
| Alternate | Natural Dispersal |
Regional Impacts
| Ecological Impact | Habitat Change | |
| Experimental studies with worms and sediments from Odense Fjord, Denmark, showed that the deeper-burrowing introduced M. viridis increased sulfur reduction and H2S in pore water, compared to the native Nerieis diversicolor, favoring more sulfide-tolerant species (Kristensen et al. 2011). | ||
| Ecological Impact | Competition | |
| The invasion of M. viridis in Odense Fjord was associated with a sharp decline in abundance of the dominant polychaete Hediste diversicolor, which may have been due to competition, or to habitat change caused by the worm, or an associated increase in abundance of the lugworm Arenicola marina (Delefosse et al. 2012). | ||