Abstract
Two species of the green alga genusCaulerpa are considered as invasive in Tunisia:Caulerpa racemosa andC. taxifolia. C. racemosa is found in a many new localities at the central and southern Tunisian coast, and even in the North of the country in colder water. These new observations lead to the hypothesis of the multiplicity of the origins of the introduction of the species and suggest possible invasive potentialities. The general thallus, and more particularly the number, the shape as well as the arrangement of ramelli on fronds allowed us to identify four morphologically different groups. These groups could be either different systematic entities or polymorphic variations of the same taxon due to different ecological conditions.Caulerpa taxifolia was observed for the first time in Tunisia at the roadstead of Sousse in the beginning of the year 2000. It is recognized as identical to that found in the other Mediterranean localities (GenBank number AJ228960). Up to the end of March 2000, a submarine prospecting campaign revealed an affected area of about 350 ha in front of 2 km of coast. Colonies ofCaulerpa taxifolia disseminating in this area appear in isolated spots. form, In the growing stage, they form surfaces varying between 0.5 to 6 m2 and located 20 to 100 m from each other. The total covered surface was estimated to be between 0.5 and 1 ha.
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References
Hamel, G 1926. Quelques algues rares ou nouvelles pour la flore méditerranéenne.Bull. Mus. Natl. Sci. Nat. Paris 32(6):420.
Jousson, O., Pawlowski, J., Zaninetti, L., Meinesz, A. & Boudouresque, C.F., 1998. Molecular evidence for the aquarium origin of the green algaCaulerpa taxifolia introduced to the Mediterranean sea.Mar. Ecol. Progr. Ser., 172: 275–280.
Langar, H., Djellouli, A., Ben Mustapha, K. & El Abed, A. 1998. Campagne de prévention et de sensibilisation à l'introduction en Tunisie deCaulerpa taxifolia. In: Boudouresque, C.F., Gravez, V., Meinesz A. & Pally, F. (eds.)Third International Workshop on Caulerpa taxifolia, Marseille, 19–20 septembre 1997, pp. 17–20. GIS Posidonie, FR.
Langar H., Djellouli, A., Ben Mustapha, K., & El Abed, A. 2000. Première signalisation deCaulerpa taxifolia (Vahl) J. Agardh en Tunisie.Bull. Inst. Natn. Sci. Tech. Mer (Tunisie), 27(1): 1–8.
Meinesz, A. & Hesse, B. 1991. Introduction et invasion de l'algue tropicaleCaulerpa taxifolia en Méditerranée nordoccidentale.Oceanol. Acta 14:415–426.
Meinesz, A., Belsher, T., Thibaut, T., Antolic, B., Ben Mustapha, K., Boudouresque, C.F., Chiaverini, D., Cinelli, F., Cottalorda, J.-M., Djellouli, A., El Abed, A., Orestano, C., Grau, A.M., Ivesa, L., Jaklin, A., Langar, H., Massuti-Pasccual, E., Peirano, A., Tunesi, L., De Vaugelas, J., Zavodnik, N. & Zuljevic, A. 2001. The introduced green algaCaulerpa taxifoliacontinues to spread in the Mediterranenan.Biol. Invasion 3: 201–210.
Vaugelas, J., Meinesz, A., Antolic, B., Ballesteros, E., Belsher, T., Cassar, N., Ceccherelli, G., Cinelli, F., Cottalorda, J.M. Frada'Orestano, C.M., Gray, A., Jaklin, A., Morucci, C., Relini, M., Sandulli, R., Span, A., Tripaldi, G., Van Klaveren, P., Zavodnik, N. & Zuljevic, A. 1999. Proposition for a standardization of map representation oCaulerpa taxifolia expansion in the Mediterraneaan Sea.Oceanol. Acta 22:85–94.
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Langar, H., Djellouli, A.S., Sellem, F. et al. Extension of twoCaulerpa species along the Tunisian coast. J Coast Conserv 8, 163–167 (2002). https://doi.org/10.1652/1400-0350(2002)008[0163:EOTCSA]2.0.CO;2
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DOI: https://doi.org/10.1652/1400-0350(2002)008[0163:EOTCSA]2.0.CO;2