Preprint volume - SIBM

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Pre-print Volume - Posters BENTHOS COMMITEE polimorfismo, erano caratterizzati da lamine a margini interi o comunque con poche proliferazioni e dimensioni medie di 30 cm. I talli di S. muticum, alcuni dei quali densamente epifitati, sono stati ritrovati su un fondo fangoso, tra i massi di una scogliera di un molo esterno, alla profondità -9 m. Non sono stati osservati talli fertili. Conclusioni – Il ritrovamento di queste NIS nel Porto di Ancona, dove probabilmente sono state introdotte mediante le carene di imbarcazioni e le acque di zavorra, sembra indicare un ampliamento dei loro areali di distribuzione. Sarebbe interessante valutare se la presenza di queste specie è limitata ad ambienti confinati e aree portuali o se sono più ampiamente diffuse in aree limitrofe il porto o sui substrati naturali del Conero. L’assenza di studi floristici recenti ed estensivi nel Medio Adriatico non consente di affermare o escludere con certezza tale ipotesi. Ulteriori indagini sono dunque necessarie per comprendere se queste specie siano stabilmente insediate nel bacino portuale e/o nelle aree limitrofe e per studiarne la fenologia morfologica e riproduttiva. Bibliografia BOUDOURESQUE C.F.,VERLAQUE M. (2002) - Biological pollution in the Mediterranean Sea: invasive versus introduced macrophytes. Mar. Pollut. Bull., 44: 32-38. CECERE E., PETROCELLI A. (2007) - Prima segnalazione di Grateloupia turuturu nel Mar Piccolo di Taranto. Riunione Annuale del Gruppo di Lavoro per l'Algologia della Società Botanica Italiana: 43. CORMACI M., FURNARI G., GIACCONE G., SERIO D. (2004) - Alien Macrophytes in the Mediterranean Sea: A rewiew. Recent Research Development Environmental Biology, 1: 153- 202. CURIEL D., MARZOCCHI M., BELLEMO G. (1996) – First report of fertile Antithamnion pectinatum (Ceramiales, Rhodophyceae) in the North Adriatic sea (Lagoon of Venice, Italy). Bot. Mar., 39: 19-22. GARGIULO G.M., DE MASI F., TRIPODI G. (1992) – Sargassum muticum (Yendo) Fensholt (Phaeophyta, Fucales) is spreading in the lagoon of Venice (Northern Adriatic Sea). Giorn. Bot. Ital., 126: 259. SOLAZZI A., CURIEL D., CHIOZZOTTO E. (1991/94) – Flora macroalgale di fondali mobili (paludi e velme) della laguna di Venezia. Nova Thalassia, 12: 59-68. ZENETOS A., CINAR M.E., PANCUCCI-PAPADOPOULOU M.A., HARMELIN J.G., FURNARI G., ANDALORO F., BELLOU N., STREFTARIS N., ZIBROWIUS H. (2005) – Annotated list of marine alien species in the Mediterranean with records of the worst invasive species. Medit. Mar. Sci., 6: 63-118. 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 275
Pre-print Volume - Posters BENTHOS COMMITEE M.C. MANGANO, A. COSENTINO, F. DE DOMENICO, N. SPANÒ Dip.to di Biologia Animale ed Ecologia Marina, Università di Messina, Salita Sperone, 31 - 98166 Messina, Italia. mmangano@unime.com ANTEDON MEDITERRANEA (ECHINODERMATA: CRINOIDEA) AS HOST OF COMMENSAL SUBADYTE PELLUCIDA (ANELLIDA: POLYCHAETA) ANTEDON MEDITERRANEA (ECHINODERMATA: CRINOIDEA) OSPITE DEL COMMENSALE SUBADYTE PELLUCIDA (ANELLIDA: POLYCHAETA) Abstract – The Mediterranean endemic comatulid Antedon mediterranea (Echinodermata: Crinoidea) is herein reported as host for symbiotic Subadyte pellucida (Annelida, Polychaeta: Polynoidae). Three adult specimens were found on two crinoids, positioned on the oral surface or on the brachial pinnules. A mating couple was confirmed by presence of cohesive egg masses in the mid parapodial region of the smaller specimen; some potential implications of reproductive strategy for this ectosymbiotic scaleworm are discussed. Key-words: Polynoidae, Comatulidae, symbiosis, Mediterranean Sea. Introduction – Symbiotic relationships involving echinoderms are well known and supported by a wide litterature. Physical protection, exploitation of new substrates and alternative trophic pathways related to the different habitats of the hosts may favour the establishment of these associations (Coppard and Campbell, 2004). Although Asterophylia, Hololepidella, Paradyte and Subadyte, are known to be associated to crinoids (Barel and Kramer, 1977; Martin and Britayev, 1998), the knowledge of these associations in the Mediterranean Sea is scanty. In this paper some information on Antedon mediterranea (Lamarck, 1816) and Subadyte pellucida (Ehlers, 1864) association, from Southern Tyrrhenian Sea, were reported. Materials and methods – Four A. mediterranea were collected in Capo d’Orlando (Sicilian coasts, Southern Tyrrhenian Sea) by trammel net at 59 meters of depth in autumn 2008 and two of them were found hosted by S. pellucida. The crinoids were fixed with ethanol 70°. The life position of scaleworm specimens on the crinoid host and their main morphological characters were subsequently assessed by means of light microscope equipped with micrometric ocular. Results – Three adults of S. pellucida were found on two A. mediterranea. Two incomplete polynoids (18 and 11 segments respectively) were found on the same host at the level of pinnules. The larger specimen showed a marked colouration pattern (Fig. 1A); the smaller was an ovigerous female, with compact sub-spherical egg masses attached on the dorsal parapodial surface, beneath the elytrae (Fig. 1B and 1C) at least on some parapodia. The two individuals probably constituted a mating couple. The third smaller specimen was recorded alone on its host, positioned on its oral surface; it was also incomplete (30 segments) and almost colourless. The occurrence of a mature couple is a not common feature in polychaetes, and in polynoids particularly (Martin and Britayev, 1998). Some polynoids are known to bring embrios beneath elitrae (Daly, 1972). The peculiar external position of egg mass let to suppose that fertilized eggs may be preciously brooded by females, but this hypothesis needs more accurate 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 276
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