Invasion
Invasion Description
1st Record: Brooklin/ME/Blue Hill Bay (1930, Glude 1954)
Geographic Extent
Brooklin/ME/Blue Hill Bay (1930, Glude 1954); Isle au Haut/ME/Gulf of Maine (Seeley 1986)
Vectors
| Level | Vector |
|---|---|
| Alternate | Hull Fouling |
| Alternate | Ballast Water |
| Alternate | Natural Dispersal |
Regional Impacts
| Ecological Impact | Predation | |
| Shells of Littorina obtusata (Smooth Periwinkle) collected at Isle au Haut, Gulf of Maine, before 1900, and in 1982-84, show a change in morphology (high-spired to low-spired) indicative of natural selection by Carcinus predation (Seeley 1986). | ||