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Caulacanthus ustulatus (Gigartinales, Rhodophyta) from Brittany (France) is an introduction from the Pacific Ocean
Rueness, J.; Rueness, E.K. (2000). Caulacanthus ustulatus (Gigartinales, Rhodophyta) from Brittany (France) is an introduction from the Pacific Ocean. Cryptogam., Algol. 21(4): 355-363.
In: Cryptogamie. Algologie. ADAC: Paris. ISSN 0181-1568, more
Peer reviewed article  

Available in  Authors 

    Caulacanthus Kützing, 1843 [WoRMS]; Rhodophyta [WoRMS]; Marine
Author keywords
    Caulacanthus; introduced species; DNA sequences; marine red algae; Rubisco spacer; rDNA ITS2

Authors  Top 
  • Rueness, J.
  • Rueness, E.K.

    Caulacanthus ustulatus (Turner) Kutzing was originally described from Cadiz (SW Spain) and is the only species of the genus found in Europe. For many years, the known northern limit was in the Bay of Biscay (Biarritz, south-west France), but the alga was recently recorded in Brittany, France. DNA sequences of the plastid encoded Rubisco spacer and sequences of the nuclear ribosomal DNA internal transcribed spacer (rDNA ITS2) were used to determine the relationships between samples of Caulacanthus from Brittany (Roscoff), southern Europe (Gibraltar and Albufeira in Portugal) and East Asia (China, Japan). The sequence data obtained revealed two distinct groupings: a Pacific group containing the samples from China, Japan and Roscoff and a group containing the samples from southern Europe. This finding is consistent with the hypothesis that Caulacanthus in Brittany has been introduced from the Pacific Ocean. Minor morphological differences were observed between isolates From the two groups grown under identical culture conditions.

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