Invasion
Invasion Description
1st Record: Lubec/ME/Passamaquoddy Bay (1951, Introduced, Established, Glude 1955)
Geographic Extent
H Lubec/ME/Passamaquoddy Bay (1951, Introduced, Established, Glude 1955); Gleason Point, Perry/ME/Passamaquoddy Bay (Seeley 1986); Perry/ME/Sipp Bay (Cobscook Bay) (Seeley 1986); Quoddy Head, Lubec/ME/Passamaquoddy Bay (Trussell and Nicklin 2003); Eastport Public Pier & Breakwater/ME/Passamaquoddy Bay (8-7-2005, MIT Sea Grant 2009)
Vectors
| Level | Vector |
|---|---|
| Alternate | Ballast Water |
| Alternate | Hull Fouling |
| Alternate | Natural Dispersal |
Regional Impacts
| Ecological Impact | Predation | |
| Shells of Littorina obtusata (Smooth Periwinkle) at Gleason Point and Sipp Bay show differences in shell morphology (high-spired and low-spired), related to Carcinus maenas abudance, indicative of natural selection by Carcinus predation (Seeley 1986). In L. obtusata, the shell thickness is increased after the snail is exposed to odors of C. maenas and is larger when accompanied by the odor of crushed L. obtusata, and this response is greater in southern Gulf populations than those from Quoddy Bay (Trussell and Nicklin 2002). | ||