Invasion
Invasion Description
1st Record: Cape Town region/South Africa/Atlantic Ocean (1992, Simon-Blecher et al. 2008) (Balanus glandula: from North-West America to the west coast of South Africa Authors: Simon-Blecher, N.; Granevitze, Z.; Achituv, Y. Source: African Journal of Marine Science, Volume 30, Number 1, May 2008 , pp. 85-92(8) Publisher: NISC Pty Ltd)
Geographic Extent
South Africa/Elands Bay (2007, Laird and Griffiths 2008); Cape Columbine//South Africa/Atlantic Ocean (2007, Simon-Blecher et al. 2008); Marcus Island/South Africa/Saldanha Bay (2007, Simon-Blecher et al. 2008; Haupt et al. 2010, oyster farms); Camps Bay/South Africa/Atlantic Ocean (2007, Simon-Blecher et al. 2008); Sea Point//South Africa/Atlantic Ocean (2007, Simon-Blecher et al. 2008); Blouberstrand/South Africa/Atlantic Ocean (2007, Simon-Blecher et al. 2008); Cape Columbine/South Africa/Atlantic Ocean (2007, Simon-Blecher et al. 2008) to Misty Cliffs on the west coast of the Cape Peninsula/South Africa/Atlantic Ocean ( 00000 -32. 3, 18.35) Present distribution and abundance of the introduced barnacle Balanus glandula Darwin in South Africa Authors: Laird, M.C.; Griffiths, C.L. Source: African Journal of Marine Science, Volume 30, Number 1, May 2008 , pp. 93-100(8)
Vectors
| Level | Vector |
|---|---|
| Alternate | Hull Fouling |
| Alternate | Ballast Water |
Regional Impacts
| Ecological Impact | Habitat Change | |
| The abundance of the native periwinkle Afrolittorina africana is strongly correlated with that of B. glandula, probably because the brancles provide shelter for the snails (Griffiths et al. 2011). The replacement of Mytlilus galloprovincialis by B. glandula led to a decrease in habitat complexity in the upper intertidal zone (Sadchatheeswaran and Branch 2015). | ||
| Ecological Impact | Competition | |
| The invasion of Balanus glandula was accompanied by a decline of Mytlilus galloprovincialis in the upper intertidal (Sadchatheeswaran and Branch 2015). | ||