Invasion
Invasion Description
1st Record: Canoe Beach, Nahant/MA/Massachusetts Bay (2010, Ramsay-Newton et al. 2016, 4225012.600N, 7054021.300W)
Geographic Extent
north to Cape Ann/MA/Gulf of Maine (2011, James T. Carlton, email to Paul Fofonoff); Niles Beach, Gloucester/MA/Massachusetts Bay (4/19/12, Savoie and Sunders 2013); Good Harbor Beach, Gloucester/MA/Massachusetts Bay (2012, Newton et al. 2013); Singing Beach, Manchester/MA/Massachusetts Bay (2012, Newton et al. 2013); West Beach, Beverly/MA/Massachusetts Bay (2012, Newton et al. 2013); Pea Island, Nahant/MA/Massachusetts Bay (2012, Newton et al. 2013); Canoe Beach, Nahant/MA/Massachusetts Bay (2010, Ramsay-Newton et al. 2016, 4225012.600N, 7054021.300W)
Vectors
| Level | Vector |
|---|---|
| Alternate | Hull Fouling |
| Alternate | Ballast Water |
| Alternate | Natural Dispersal |
Regional Impacts
| Ecological Impact | Habitat Change | |
At Nahant MA, on Massachusetts Bay, Dasysiphonia japonica was dominant in areas with reduced native diversity, had higher rates of nitrate uptake, grew faster than other dominants, and had reduced grazing from a common herbivore, the native snail Lacuna vincta (Chink Shell). These differences were context-dependent; growth rates of the species did not differ in isolation in the laboratory (Low et al. 2014). However, the aggressiveness and nutrient uptake of D. japonica decreased in the 5 years since the initial invasion. The biodiversity of the community continued to be reduced after the invasion (Ramsay-Newton et al. 2016). | ||