Since 1984 the green tropical alga Caulerpa taxifolia (Chlorophyta), of aquarium origin, has spread rapidly along the north-western Mediterranean sea coast. This alga was recently discovered on the Mediterranean south coast (Tunisia) and the west coast of the United States. This paper presents modeling efforts to simu late Caulerpa taxifolia expansion. Three different mod els were built; the first model is based on stochastic discrete event simulation coupled with a geographical information system. The second model uses a neural network, trained with simulation data and is consid ered as a metamodel. The third is a multimodel de signed to simulate a biocontrol. Indeed, to control Caulerpa overhang, it may be possible to use special ized predator of C. taxifolia such as Elysia subornata (Mollusca, Ascoglossa). Simulation was mandatory before any introduction to estimate the potential re duction of the colonization by C. taxifolia. Encourag ing results concerning the use of E. subornata are pre sented.
Aussem A., Hill D., 1999, "Wedding connectionist and algorithmic modelling: towards forecasting Caulerpa taxifolia development in north-western Mediterranean sea", Ecological modelling, Vol 120, pp 225-236.
2.
Aussem A., Hill D., 2000, "Neural networks metamodelling for the prediction of Caulerpa taxifolia development in the Mediterranean sea", Neurocomputing Letters, Neurocomputing, Vol 30, pp 71-78.
3.
Avon, M., Dimeet, J., Henocque, Y., Sauzade, D. and Skierniewski, E. , 1996. Eradication de l'algue Caulerpa taxifolia. Démonstration des performances des techniques de destruction in situ. In: Ribera, M. A., Ballesteros E., Boudouresque C.F., Gomez, A. and Gravez, V. (Editors), Second International Workshop on Caulerpa taxifolia., Univ. Barcelona Publ., Sp., pp 135-137.
4.
Bartoli, P. and Boudouresque, C.F. , 1997. Transmission failure of parasites (Digenea) in sites colonized by the recently introduced invasive alga Caulerpa taxifolia, Mar. Ecol. Prog. Ser.154 : 253-60.
5.
Belsher, T., Peirano, A., Puccini, M., Boutbien, M., Blanc, M., Coroller, J.M., Dagault, F., Emery, E., Fugazzi, P., Goraguer, H., Le Gall, E., Marchfeld, J.P., Peleau, M., Pucci, R. and Thibaut, T., 1999. Acquisition de données qualitatives et quantitatives sur l'expansion de l'algue Caulerpa taxifolia. Campagnes océanographiques Califa du NO "L'Europe" (IFREMER/Icram). In: Gravez, V., Boudouresque, C. F., Meinesz, A., Scabbia G. (Editors), Fourth International Workshop on Caulerpa taxifolia , GIS Posidonie Publ., Lerici, in press.
6.
Cellier, F.E.1979. Combined Continuous System Simulation by Use of Digital Computers: Technique and Tools. Ph.D. Thesis, Swiss Federal Institute of Technology, Zurich.
7.
Clark, K.B., Busacca, M., and Stirts, H.1979. Nutritional aspects of development of the ascoglossan, Elysia cauze, Reproductive ecology of marine invertebrates, Stancyk, (ed.), University of South Carolina , Columbia, 11-24.
8.
Coquillard, P. and Hill, D., 1997. Modélisation et Simulation d'Ecosystèmes. Des modèles analytiques à la simulation à évenéments discrets. Collection Ecologie, Masson, Paris, 273 pp.
9.
Coquillard, P., Thibaut, T., Hill, D., Gueugnot, J., Mazel, C., and Coquillard, Y.2000. Modelling and simulation of the mollusc Ascoglossa Elysia subornata Verril population dynamic: Application to the potential biocontrol of Caulerpa taxifolia (Vahl) C. Agardh growth in the Mediterranean Sea, Ecological Modeling, 135(1):1-16.
10.
Cottalorda, J.M., Robert, P., Charbonnel, E., Dimeet, J., Menager, V., Tillman, M., de Vaugelas, J., and Volto, E., 1996. Eradication de la colonie de Caulerpa taxifolia découverte en 1994 dans les eaux du Parc National de Port-Cros (Var, France) . In: Ribera, M. A., Ballesteros, E., Boudouresque, C.F., Gomez, A. and Gravez, V. (Editors), Second International Workshop on Caulerpa taxifolia., Univ. Barcelona Publ., Sp., pp 149-156.
11.
Escoubet, P. and Brun, V., 1994. Utilisation de la carboglace et des ultrasons comme source d'éradication de Caulerpa taxifolia (Vahl) C. Agardh. In: Boudouresque C.F., Meinesz, A. and Gravez, V. (Editors), First International Workshop on Caulerpa taxifolia, GIS Posidonie Publ., Fr., pp 333-337.
12.
Fishwick, P.A., 1993. A Simulation Environment for MultimodelingDiscrete Event Dynamic Systems: Theory and Applications (3):151-171.
13.
Fishwick, P.A., 1995. Simulation Model Design and Execution: Building Digital Worlds. Prentice Hall, Englewood Cliffs, New Jersey, 448 pp.
14.
Francour, P., Harmelin-Vivien, M., Harmelin, J.G., Duclerc, J., 1995. Impact of Caulerpa taxifolia colonization on the littoral ichthyofauna of North-Western Mediterranean Sea: preliminary results . Hydrobiologia300/301: 345-353.
15.
Gavach, C., Bonnal, L., Uchimura, M., Sandeaux, R., Sandeaux, J., Souard, R., Lamaze, B., Lassere, J.C., Fougairolle, C., Combes, J.F., Gravez, V., 1999. Destruction de Caulerpa taxifolia par la technique de la couverture à ions cuivriques. Développement pré-industriel et premier essais . In: GIS Posidonie (Editors), Third International Workshop on Caulerpa taxifolia, Marseille, pp 101-104.
16.
Hill, D., 1996, Object-Oriented Analysis and Simulation. Addison-Wesley Longman, 291 pp.
17.
Hill, D., 1995. Verification and Validation of Ecosystem Simulation Models . In Tunçer Ören and Louis G. Birta (Editors), Proceedings of the SCSC '95, Ottawa, Ontario, Canada, July 24-26, pp 176-181.
18.
Hill, D., Coquillard P., Garcia B., Traore, M.K., Mazel, C., Campos, A., Thibault, T., 2000, "Multimodeling and Object-oriented Design Patterns Application to Bio-control Simulation", Proceedings of Artificial Intelligence and Simulation2000, Arizona, pp 219-228, March 2000.
19.
Hill, D., Coquillard P., de Vaugelas, J., 1997, "Discrete-Event Simulation of Alga Expansion", SIMULATION, Vol 68, No 5, pp 269-277.
20.
Hill, D., Coquillard P., de Vaugelas, J., Meinesz, A., 1998, "An Algorithmic Model for Invasive Species Application to Caulerpa taxifolia (Vahl) C. Agardh development in the North-Western Mediterranean Sea", Ecological Modelling, Vol 109, pp 251-265.
21.
Hill, D., Coquillard, P., de Vaugelas, J., Meinesz, A., 1995 "A stochastic model with spatial constraints", EUROSIM Congress, September 11-15, Vienna, Austria, pp 999-1004, 1995.
22.
Hill, D., Mazel, C. and Coquillard, P., 1996. Integrating V&V in the object-oriented life cycle of ecological modelling simulation projects. In Proceedings of the European Simulation Symposium 96, Oct. 24-26, Genoa, Italy.
23.
ICES (International Council for the Exploration of the Sea) , 1997. Study group on marine biocontrol of invasive species. La Tremblade 1997. Copenhagen: draft report.
24.
Jaffrenou, B. and Odonne, L., 1996. Procédé de maitrise et de réduction du développement de Caulerpa taxifolia en Méditerranée. In: Ribera, M. A., Ballesteros, E., Boudouresque, C.F., Gomez, A. and Gravez, V. (Editors), Second International Workshop on Caulerpa taxifolia. Univ. Barcelona Publ., Sp., pp 145-148.
25.
Jousson, O., Pawlowski, J., Zaninetti, L., Meinesz, A., Boudouresque, C.F., 1998. Molecular evidence for the aquarium origin of the green alga Caulerpa taxifolia introduced to the Mediterranean Sea. Mar. Ecol. Prog. Ser.172: 275-280.
26.
Lafferty, K.D. and Kurris, A., 1996. Biocontrol of marine pests, Ecology , 77: 1989-2000.
27.
Langar, H., Djellouli, A., Ben Mustapha, K., El Abed, A., 2000. Première signalisation de Caulerpa taxifolia (Vahl) C. Agardh en Tunisie, Bull. Inst. Sci. Tech. Mer, 27: 7-8.
28.
Meinesz, A. and Hesse, B.1991. Introduction et Invasion de l'algue Caulerpa taxifolia en Méditerranée nord-occidentale, Oceanol. Acta, 14(4):415-426.
29.
Meinesz, A., Benichou, L., Blachier, J., Komatsu, T., Lemee, R., Molenaar, H. and Mari, X., 1995. Variations in the Structure, Morphology and Biomass of Caulerpa taxifolia in the Mediterranean Sea. Bot. Mar. , 38: 499-508.
30.
Meinesz, A. and Boudouresque, C.F. , 1996. Sur l'origine de Caulerpa taxifolia en Méditerranée. Comptes Rendus de l'Académie des Sciences, Paris, Life Sciences, 319, pp 603-613.
31.
Meinesz, A., Cottalorda, J.M. and Chiavérini, D.1998. Suivi de l'invasion de l'algue tropicale Caulerpa taxifolia devant les côtes françaises de la Méditerranée: Situation au 31 décembre 1997 . Laboratoire Environnement Marin Littoral (Editors), Université de Nice-Sophia Antipolis: 165-168.
32.
Meinesz, A., Melnick, J., Blachier, J. and Charrier, S., 1996. Etude préliminaire, en aquarium, de deux ascoglosses tropicaux consommant Caulerpa taxifolia: une voie de recherche pour la lutte biologique . In: Ribera, M. A., Ballesteros, E., Boudouresque, C.F., Gomez, A. and Gravez, V. (Editors), Second International Workshop on Caulerpa taxifolia. Univ. Barcelona Publ., Sp., pp 157-161.
33.
Poizat, C. and Boudouresque, C.F. , 1996. Méiofaune du sédiment dans des peuplements a Caulerpa taxifolia du Cap Martin (Alpes-Maritimes, France) . In: Ribera, M. A., Ballesteros, E., Boudouresque, C. F., Gomez, A. and Gravez, V. (Editors), Second International Workshop on Caulerpa taxifolia, Univ. Barcelona, pp 375-386.
34.
Riera, F., Pou, S., Grau, A.M., Delgado, O., Weitzmann, B. and Ballesteros E., 1994. Eradication of a population of the tropical green algae Caulerpa taxifolia in Cala d'Or (Mallorca, Western Mediterranean): methods and results. First International Workshop on Caulerpa taxifolia. Boudouresque, C. F., Meinesz, A. and Gravez, V. (Editors), GIS Posidonie, Marseille (France), 327-331.
35.
Thibaut, T., Meinesz, A., Burtaire, L., Charrier, S., Mangialajo, L., Ierardi, S. and Vidal, V.1998. Biological control of Caulerpa taxifolia in the Mediterranean Sea: Use of tropical and Mediterranean ascoglossans. In: Third International Workshop on Caulerpa taxifolia , GIS Posidonie edit. Marseille , 19-20 September, 105-111.
36.
Thibaut, T. and Meinesz, A., 2000. Are the Mediterranean ascoglossan molluscs Oxynoe olivacea and Lobiger serradifalci suitable agents for a biological control against the invading alga Caulerpa taxifolia, C. R Acad. Sci. Paris, Sciences de la vie/ Life Sciences, 323: 477-488.
37.
Thibaut, T., Meinesz, A., Amade, P., Charrier, S., De Angelis, K., lerardi, S., Mangialajo, L., Melnick, J. and Vidal, V.2000. Elysia subornata (Mollusca) a potential control agent of the alga Caulerpa taxifolia (Chlorophyta) in the Mediterranean Sea . J. Mar. Biol. Ass. UK, in press.
38.
Verlaque, M. and Fritayre, P., 1994. Modifications des communautés algales méditerranéennes en présence de l'algue envahissanteCaulerpa taxifolia (Vahl) C. Agardh, Oceanol. Acta, 17: 659-672.
39.
Villèle, X. de and Verlaque, M., 1995. Changes and Degradation in a Posidonia oceanica bed invaded by the Introduced Tropical Alga Caulerpa taxifolia in the North-Western Mediterranean , Bot. Marina, 38: 79-87.
