Invasion
Invasion Description
1st Record: Oahu/HI/Pearl Harbor (1993, Southward et al. 1999; Zabin et al. 2007; Carlton and Eldredge 2009);
Geographic Extent
Waiakea Peninsula, Hawaii/HI/Hilo Bay (2001, Zardus and Hadfield 2005); Keaukaha Beach/Hawaii/HI/Puhi Bay (2001, Zardus and Hadfield 2005); Molokai/HI/Kaunakakai Harbor (2002, Zardus and Hadfield 2005); Maui/HI/Maalea Small Boat Harbor (Southward et al. 1999); Maui/HI/Kahului Harbor (Southward et al. 1998); Oahu/HI/Pearl Harbor (1993, Southward et al. 1999; Zabin et al. 2007; Carlton and Eldredge 2009); Oahu/HI/Kaneohe Bay (1995, (1993, Southward et al. 1998; Zabin et al. 2007; Carlton and Eldredge 2009); Kauai/HI/Nawiliwili Harbor (Southward et al. 1998); Kauai/HI/Port Allen (Southward et al. 1998); Midway Island/HI/Pacific Ocean (Southward et al. 1998)
Vectors
| Level | Vector |
|---|---|
| Alternate | Hull Fouling |
| Alternate | Ballast Water |
Regional Impacts
| Ecological Impact | Competition | |
| The invasion of C. proteus in the Hawaiian Islands has coincided with reductions in abundance of the introduced barnacles Amphibalanus amphitrite and A. reticulatus. In experiments in which settling C. proteus were removed from fouling plates, numbers of settling A. reticulatus increased, but no A. amphitrite occurred on plates. The effect of competition with C. proteus is to compress the vertical distribution of A. reticulatus and exclude it from much of the intertidal zone through competition for space (Zabin et al. 2007). High densities of C. proteus also reduce densities of the native high intertidal limpet Siphonaria normalis in manipulative experiments (Zabin and Altieri 2007). | ||