Invasion
Invasion Description
1st Record: New Haven/CT/Long Island Sound (1879, Bequaert 1943)
Geographic Extent
Lloyd's Neck/NY/Long Island Sound (1881, Bequaert 1943); . New Haven/CT/Long Island Sound (1879, Bequaert 1943); Cold Spring Harbor/NY/Long Island Sound (Balch 1899; Stonington/CT/Fishers Island Sound (Bequaert 1943); CT/Saugatuck River, Beach Just E Of River Mouth (USNM 715599, US National Museum of Natural History 2008); Westbrook/CT/Long Island Sound (Museum of Comparative Zoology 2008); Long Island, Sea Cliff/NY/Long Island Sound (MCZ 219933, Museum of Comparaitve Zoology 2008); Oyster Bay/NY/Long Island Sound (MCZ 236890, Museum of Comparative Zoology 2008)
Vectors
| Level | Vector |
|---|---|
| Alternate | Natural Dispersal |
| Alternate | Ballast Water |
| Alternate | Hull Fouling |
Regional Impacts
| Ecological Impact | Herbivory | |
| In Port Jefferson Harbor, NY, Long Island Sound, grazing by L. littorea also reduced abundance of Ulva, though dense patches were grazed only at high densities and the alga managed to persist in irregularities in the rocks (Petraitis 1983). | ||
| Ecological Impact | Habitat Change | |
| Grazing by L. littorea had different effects on the Rock Barnacle Semibalanus balanoides (in Long Island Sound, NY) depending on snail density. Moderate densities favored barnacle settlement by removing algae, but high densities of snails removed large numbers of barnacle cyprids (Petraitis 1983). | ||