Proceedings of the Second Mediterranean Symposium on Marine

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Table 6 - Mean values <strong>of</strong> vegetative characteristics <strong>of</strong> Batophora sp. from Torre Borraco. Ranges reported for B. occidentalis and B. oerstedii by Berger and Kaever (1992), by Gomez-Poot et al. (2002) and for Dasycladus vermicularis from <strong>the</strong> Ionian Sea have been included for comparative purposes. Unavailable measurements are indicated with a dash. Apulian Apulian Berger & Gomez-Poot Berger & Gomezsamples samples Kaever et al. Kaever Poot et al. Height (cm) 2-6 5-6 2-4 3.7 4-14 3.9 Axis width (mm) 2-3 0.50 - 0.54 - 0.52 Width <strong>of</strong> <strong>the</strong> plant (mm) 5 3 2-4 4.31 6-13 4.58 Internodal distance (mm) Branching < 0.50 1 1.6 0.74 2.1 0.58 order 3rd 4th-5th 5th-7th - 5th-7th - DISCUSSION AND CONCLUSIONS Gelidiella sp. is similar to <strong>the</strong> <strong>Mediterranean</strong> G. tenuissima and to <strong>the</strong> Atlantic G. tinerfensis Seoane-Camba in habit and habitat respectively. Compared to G. tenuissima, Gelidiella sp. has a larger thallus and different organisation <strong>of</strong> tetrasporangial sori. G. tinerfensis differs from Gelidiella sp. in that it bears more tetrasporangia per tier and <strong>the</strong>ir stichidia are very <strong>of</strong>ten branched. The peculiar characters observed in Gelidiella sp. such as shape and arrangement <strong>of</strong> outer cortical cells and number <strong>of</strong> tetrasporangia per tier are convincing enough to establish a new species. The permanently sterile state <strong>of</strong> <strong>the</strong> Apulian Batophora sp. that has been monitored for three years created many diagnostic difficulties. The attribution <strong>of</strong> <strong>the</strong> Apulian dasycladalean plants to <strong>the</strong> genus Batophora is supported by distinct features. On <strong>the</strong> contrary, <strong>the</strong> attribution to a known species is not possible with certainty only on <strong>the</strong> basis <strong>of</strong> <strong>the</strong> vegetative characters, even though, according to Berger (pers. comm.); our specimens are more similar to B. occidentalis. At <strong>the</strong> moment it is difficult to advance any hypo<strong>the</strong>sis on ei<strong>the</strong>r <strong>the</strong> period or means <strong>of</strong> introduction <strong>of</strong> this tropical genus into <strong>the</strong> <strong>Mediterranean</strong> basin or on <strong>the</strong> sterility <strong>of</strong> our population. ACTES DU DEUXIEME SYMPOSIUM MEDITERRANEEN SUR LA VEGETATION MARINE (ATHENES, 12-13 DECEMBRE 2003) 81
PROCEEDINGS OF THE SECOND MEDITERRANEAN SYMPOSIUM ON MARINE VEGETATION (ATHENS, 12-13 DECEMBER 2003) 82 ACKNOWLEDGEMENTS We thank Dr. J. Espinoza-Avalos for providing liquid-preserved samples <strong>of</strong> B. oerstedii and B. occidentalis from Mexico, Dr. S. Berger for her useful suggestions and Pr<strong>of</strong>. G. P. Felicini for help with photography. REFERENCES Berger S., Kaever M. J. (1992) - Dasycladales. An illustrated monograph <strong>of</strong> a fascinating algal order. Georg Thieme Verlag Stuttgart, New York: 247 pp. Furnari G., Giaccone G., Cormaci M., Alongi G., Serio D. (2003) - Biodiversità marina delle coste italiane: catalogo del macr<strong>of</strong>itobenthos. Biol. Mar. Medit., 10 (1): 1-482. Gomez-Poot J. M., Espinoza-Avalos J., Jimenez-Flores S. G. (2002) - Vegetative and reproductive characteristics <strong>of</strong> two species <strong>of</strong> Batophora (Chlorophyta, Dasycladaceae) from Chetumal Bay, Quintana Roo, Mexico. Bot. Mar., 45: 189-195. Haroun R. J., Gil-Rodríguez M. C., Díaz De Castro J., Prud'homme Van Reine W. F. (2002) - A Checklist <strong>of</strong> <strong>the</strong> marine plants from <strong>the</strong> Canary Islands (central eastern Atlantic Ocean). Bot. Mar., 45 (2): 139-169.
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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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CARACTERISATION DE L’ETAT DES HER
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RESULTATS A- PHENOLOGIE Les princip
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Les futures recherches scientifique
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Williamson and Fitter, 1996; Piazzi
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Fig. 2: Spatial patterns of
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vulnerable to invaders. In reality
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BIOMONITORING OF ENVIRONMENTAL METL
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Table 1: Mercury concentration (in
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fraction of <stron
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EFFETS DE L’INCORPORATION DE L’
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Les aliments ont été distribués
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REFERENCES Association of</
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Jonge et al., 2002). Nutrient conce
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to total dissolved inorganic nitrog
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offs (group B; Fig
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PHYTOBENTHOS AS QUALITY ELEMENT FOR
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Padina pavonica and Halopteris scop
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Gelidiella ramellosa II - - - - 5.7
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CARACTERISATION DES HERBIERS A POSI
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une analyse lépidochronologique (P
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La limite de l’herbier à Posidon
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LITTORAL BENTHIC COMMUNITIES AS IND
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Several environmental factors were
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This category includes stations sit
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RAPID ASSESSMENT OF THE ECOLOGICAL
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For a thorough presentation <strong
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The Ecological Evaluation o
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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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