Proceedings of the Second Mediterranean Symposium on Marine

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Les futures recherches scientifiques portant sur cet herbier de Posidonies devront mettre l’accent sur : - la localisation et la dynamique de la limite inférieure des herbiers à Posidonia oceanica; ce suivi peut être basé sur la mise en place de balises (repères fixes) au contact de l’herbier il devra être réalisé en plongée. - la vitalité de l’herbier ; elle sera estimée par des mesures in situ de densité et de recouvrement, complétées par des prélèvements de faisceaux pour l’étude phénologique et lépidochronologique sur une période d’étude plus étendue dans le temps (cycle annuel); - la position et la structure de la limite supérieure de l’herbier grâce à la télédétection aéroportée (photographies aériennes ou satellitaire). REFERENCES Ben Mustapha K. & Hattour A. (1992) – Les herbiers de Posidonies du littoral tunisien : I : Le golfe de Hammamet. Nat. Inst. Nat. Scien. Techn. Océanog. Pêche, Salammbô, 2 : 1-20. Blanpied C., Burrolet P.F., Clairfond P. & Shimi M. (1979) – Sédiments actuels et holocènes. In : Géologie Méditerranéenne, la Mer pélagienne. 6(1) : 61-82. Burollet P.F. (1983). Répartition des posidonies à l’Est de la Tunisie. Rapp. Comm. Int. Mer Médit., 28(3) : 173-174. Le Danois E. (1925) – Recherches sur les fonds chalutables des côtes de Tunisie (croisière du chalutier ‘Tranche’ en 1924). Annls. Sta. Océanogr. Salammbô, 1 : 1-56. Molinier R. & Picard J. (1954) – Eléments de bionomie marine sur les côtes de Tunisie. Bull. Sta. Océanogr. Salammbô, 48 : 1-47. Pergent G., Ben Maiz N., Boudouresque C.F. & Meinesz A. (1989) – The flowring <strong>of</strong> Posidonia oceanica over <strong>the</strong> past fifty years: a lepidochronological study. In: Boudouresque C.F., Meinesz A., Fresi E. & Gravez V. (eds.), International Workshop on Posidonia oceanica Beds. GIS Posidonie Publ. 1: 57-61. Ramos-Espla A.A., Ouergui A., Bayle J.T., Ben Mbarek N., Fernandez-Torquemada Y., Guallouz S., Khidri R., Sanchez-Lizaso J.L. & Yamaks S. (2000) – Contribution a la caractérisation des herbiers à Posidonia oceanica (L.) Delille aux îles Kerkennah (Est de la Tunisie, Méditerranée orientale), Actes du premier symposium Méditerranéen sur la végétation marine (Ajaccio, 3-4 octobre 2000), 1 :177-181. ACTES DU DEUXIEME SYMPOSIUM MEDITERRANEEN SUR LA VEGETATION MARINE (ATHENES, 12-13 DECEMBRE 2003) 167
PROCEEDINGS OF THE SECOND MEDITERRANEAN SYMPOSIUM ON MARINE VEGETATION (ATHENS, 12-13 DECEMBER 2003) 168 MACROALGAL ASSEMBLAGES IN THE GULF OF NAPLES: SPATIAL VARIABILITY IN RELATION TO ANTHROPOGENIC DISTURBANCE Ivan GUALA, Antonio ESPOSITO. and Maria Cristina BUIA Benthic Ecology Laboratory - Stazione Zoologica ‘A. Dohrn’ Punta S. Pietro 80077 Ischia (Naples) - ITALY Ivan Guala guala@szn.it ABSTRACT Subtidal assemblages are affected by biotic and abiotic factors which work at different spatial scales; moreover human activities can be an important source <strong>of</strong> variation in community composition. In order to detect <strong>the</strong> macroalgal assemblages variability in relation to anthropogenic disturbance, a visual assessment <strong>of</strong> <strong>the</strong> cover <strong>of</strong> algal species was performed on subhorizontal rocky substrates, at both 5 and 10 m depths, in 12 localities <strong>of</strong> <strong>the</strong> Gulf <strong>of</strong> Naples (Italy), for a total <strong>of</strong> 216 observations. Important taxa in differentiating localities were identified. Among <strong>the</strong>se, Caulerpa racemosa, recently introduced in <strong>the</strong> studied area, was one <strong>of</strong> <strong>the</strong> most important species in differentiating impacted and relatively undisturbed localities. Deep non impacted communities seem to be more vulnerable to <strong>the</strong> introduction <strong>of</strong> this alien seaweed. Its invasiveness, strictly linked to its reproductive modality, may be associated with summer anchorages <strong>of</strong> many leisure boats ra<strong>the</strong>r than with <strong>the</strong> environmental conditions <strong>of</strong> recipient localities. KEY-WORDS: community diversity, anthropogenic disturbance, rocky substrate, Caulerpa racemosa. INTRODUCTION Urban development and anthropogenic activities are <strong>of</strong>ten <strong>the</strong> cause <strong>of</strong> disturbance on marine communities (GESAMP, 1997; Lindegarth and Hoskin, 2001). Plant assemblages may be threatened by chemical contaminants, excess nutrients, sewage discharge, reduced light penetration which can alter species composition and also limit <strong>the</strong> growth and depth distribution <strong>of</strong> plant species (Boyle, 1984; GESAMP, 1997; Middelboe and Sand-Jensen, 1998). Industrial centres, mercantile ports, power plants, touristic and fishing harbours, aquaculture facilities and, generally, densely populated urban zones, represent <strong>the</strong> most important sources <strong>of</strong> disturbance. In recent years many authors have also indicated biological invasions as a possible threat to marine environment. Trade and transports globalisation has favoured a great increase <strong>of</strong> marine species introductions all over <strong>the</strong> world. In suitable conditions, non-native species can become invasive, playing a conspicuous role in recipient ecosystems, taking <strong>the</strong> place <strong>of</strong> native species, affecting <strong>the</strong> biodiversity (Carlton and Geller, 1993;
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United Nations Environment Programm
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PROCEEDINGS OF THE SECOND MEDITERRA
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CONTENTS/SOMMAIRE Programme .......
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ORFANIDIS S., TSIAGGA E. & STAMATIS
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Friday 12 December 2003 09:00 Openi
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Discussion Discussion - Littoral be
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MAPPING MARINE VEGETATION DISTRIBUT
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1984; Boudouresque et al., 1985b; M
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Elbu cove, Scandula nature 1/ 1190
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features of P. oce
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Belsher T., Houlgatte E. (2000) - E
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Gloux B. (1984) - Méthodes acousti
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Pasqualini, V., Pergent-Martini, C.
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Here, we will firstly delineate wha
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Fig. 2. The tree of</strong
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In the same way, "
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While the
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COASTAL DEVELOPMENT The destruction
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invaders, overfishing and climate c
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At the end <strong
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to be built up, this disappearance
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Boudouresque C.F., Ribera M.A. (199
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Marchand M. (1981) - Amoco Cadiz. B
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FLORISTIC SIMILARITY AND DISCONTINU
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871 accepted taxa (Table 1). Howeve
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Fig. 2. Hystogram showing t
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4 (1.6%) and 2 (1.1%) at Spain; 5 (
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characteristics of
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Fig. 9. Hystogram showing t
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Fig. 11. Dendrogram depicting mutua
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REFERENCES Agardh C. A. (1822-1823)
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De Toni G. B. (1905) - Sylloge Alga
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Langenbach G. (1873) - Die Meeresal
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SESSION «BIOLOGY, ECOLOGY AND INVE
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Page 117 and 118: PROCEEDINGS OF THE SECOND MEDITERRA
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APPLICATION OF ECOLOGICAL INDICES O
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The average taxonomic distinctness
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On Fig. 4 each of
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OVERVIEW OF THE ACTIVITIES AIMED AT
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at the same time f
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POSTERS ACTES DU DEUXIEME SYMPOSIUM
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Mr Baris AKÇALI D.E.U. Institute <
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Mr Francesco Saverio CIVILI MED POL
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Mr Jamel KSOURI Laboratoire de Biod
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Mr Frédéric PLATINI Accord RAMOGE
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Ms Eleni TRYFON Natural Environment
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Proceedings of the Second Mediterranean Symposium on Marine

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