Balanus glandula: From North-West America to the west coast of South Africa

N. Simon-Blech, Z. Granevitze, Y. Achituv

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Abstract

We report the occurrence of the North-East Pacific inter-tidal barnacle Balanus glandula in the south-western African shores of the Atlantic Ocean. In addition, an attempt is made to trace the origin of the South African population by comparing the distribution of haplotype groups of two molecular markers, cytochrome oxidase subunit I (COI) and elongation factor 1 (EF1-α). The frequency of COI haplotypes in the South African specimens was most similar to that in specimens from Bodega Marine Laboratory and of Fort Bragg in Central California. Pairwise genetic distances demonstrated that the samples from Pillar Point were also similar to the Cape Town population. The frequency of EF1-α haplotype groups from Cape Town was most similar to that of Cape Blanco, Cape Meares and Westport Jetty, and, with lower p-values, to the populations of Cape Mendocino and Heceta Head. Pairwise genetic distances demonstrated that samples from Vancouver Island, Bodega Marine Laboratory and Heceta Head were also similar to the Cape Town population. Results indicate that the population of B. glandula from South Africa is most similar to the population from the northern portion of the Oregonian faunal province. It is possible that this is the origin of the South African population. As a result of this invasion, B. glandula out-competed the native African chthamalid species, Chthamalus dentatus. Thus, C. dentatus is presently very rare on the Atlantic South African shores.

Original languageEnglish
Pages (from-to)85-92
Number of pages8
JournalAfrican Journal of Marine Science
Volume30
Issue number1
DOIs
StatePublished - May 2008

Bibliographical note

Funding Information:
Acknowledgements — We thank Profs G Branch and CL Griffiths (University of Cape Town) for their hospitality and help in collection of samples. Prof. Griffiths also provided the in situ photographs shown in Figure 2a. We thank Prof. WA Newman (Scripps Institution of Oceanography) for confirmation of the identification of samples of B. glandula and for providing samples from La Jolla. Dr R Levy-Drummer (Bar Ilan University) is thanked for help in the statistical analysis. This study was financed by the US-Israel Binational Science Fund Grant 2004-239.

Funding

Acknowledgements — We thank Profs G Branch and CL Griffiths (University of Cape Town) for their hospitality and help in collection of samples. Prof. Griffiths also provided the in situ photographs shown in Figure 2a. We thank Prof. WA Newman (Scripps Institution of Oceanography) for confirmation of the identification of samples of B. glandula and for providing samples from La Jolla. Dr R Levy-Drummer (Bar Ilan University) is thanked for help in the statistical analysis. This study was financed by the US-Israel Binational Science Fund Grant 2004-239.

FundersFunder number
US–Israel Binational Science Fund2004-239

    Keywords

    • Balanus glandula
    • COI
    • Competition
    • EF1-α
    • Haplotypes
    • Invasion
    • South Africa

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