Preprint volume - SIBM
Preprint volume - SIBM Preprint volume - SIBM
Pre-print Volume - Oral presentations Topic 2: MARINE ORGANISMS AND ECOSYSTEMS AS MODEL SYSTEMS This phenomenon has to be read not only as a new case of warm-water affinity species which extends its range north-wards. Its potential is of becoming a new indicator of Mediterranean Sea meridionalization characterized by cheap and easy monitoring. Its size and morphological characters allow easy identification. The species can’t be misidentified with others. It lives in the mesolittoral, most populations can be accessed without entering the water, therefore no special techniques nor any diving equipment is needed for observations and collections. However, its reproductive cycle which is the key factor in its distribution expansion is strictly associated to the sea water temperature. Last, but not least, the wide latitudinal range of the Italian coastline is perfect for the study of these phenomena. Our plans, funding pending, are to establish a richer database of presence data of E. punctata from the Italian coastline, obtain a wider SST time series, look for a formal correlation between distribution and temperature data, fully understand the biological reproductive mechanism of the species (comparing, for example, the time of the gonad maturation at different latitudes) and the origin of populations (with molecular markers), define a monitoring protocol and evaluate the possibility of a previsional model. References ALBANO P.G., TRONO D. (2008) – On the occurrence of Echinolittorina punctata (Gmelin, 1791) (Gastropoda: Littorinidae) in Puglia, South-Eastern Italy. Boll. Malacol., 44 (9-12): 123-126. ANTIT M., GOFAS S., AZZOUNA A. (2007) – New records of upper shore Mollusca for the Tunisian coast: newcomers or overlooked? Mar. Biodiv. Rec., 1, published on-line doi: 10.1017/S1755267207000206. BIANCHI C.N. (2007) – Biodiversity issues for the forthcoming tropical Mediterranean Sea. Hydrobiologia, 580: 7-21. D'ANNA G. (1997) – Segnalazione di Nodilittorina punctata (Gmelin, 1791) per Zambrone (Vibo Valentia). Notiziario SIM, 15 (1-4): 20. PALANT B., FISHELSON L. (1968) – Littorina punctata (Gmelin) and Littorina neritoides (L.), (Mollusca, Gastropoda) from Israel: ecology and annual cycle of genital system. Isr. J. Zool., 17: 145-160. SOPPELSA O., CROCETTA F., FASULO G. (2004) – Prime segnalazioni di Nodilittorina punctata (Gmelin, 1791) per il Golfo di Salerno, il Golfo di Napoli ed i litorali laziali (Tirreno centromeridionale). Boll. Soc. Naturalisti Napoli, Nuova Serie, 2 (2003-2004): 41-44. 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 99
Pre-print Volume - Oral presentations Topic 2: MARINE ORGANISMS AND ECOSYSTEMS AS MODEL SYSTEMS M. BO, C.G. DI CAMILLO, M. BERTOLINO, P. POVERO 1 , C. MISIC 1 , M. CASTELLANO 1 , A. COVAZZI HARRIAGUE 1 , G.P. GASPARINI 2 , M. BORGHINI 2 , K. SCHROEDER 2 , G. BAVESTRELLO 1 DisMar, Università Politecnica delle Marche - 60131 Ancona, Italia. m.bo@univpm.it 2 DipTeRis, Università degli Studi di Genova - 16132 Genova, Italia. 3 CNR-ISMAR - 19036 La Spezia, Italia. THE MEGABENTHIC ASSEMBLAGES OF THE VERCELLI SEAMOUNT (NORTH TYRRHENIAN SEA) LE COMUNITÀ MEGABENTONICHE DEL VERCELLI SEAMOUNT (MAR TIRRENO SETTENTRIONALE) Abstract - The megabenthic assemblages of the Vercelli Seamount (North Tyrrhenian Sea) were studied through ROV imaging from 60 to 500 m depth and a peculiar benthos zonation was observed. The shallower rocky peak (60-100 m depth) hosted a very reach coralligenous community characterized, on the top by the kelp Laminaria rodriguezii, by gorgonian assemblages on the southern flank and by sponges-soft corals assemblages on the northern one. On the detritic bottom at the base of the peak, a very dense population of the crinoid Leptometra phalangium was observed. On the edge of the detritic plain, around 180-200 m depth, a ring of the yellow scleractinian coral Dendrophyllia cornigera, mainly dead, was recorded. The rocky slopes from 200 to 500 m depth, covered by a thick iron-manganese crust, were very poorly colonized, mainly by encrusting sponges and serpulids. This research is the first detailed investigation, through ROV imaging, of megabenthic communities living on a Mediterranean seamount, representing therefore a study model for this peculiar ecosystem. Key-words: benthos, seamounts, Tyrrhenian Sea, ROV imaging. Introduction - Seamounts are considered to be hotspots of marine biodiversity being characterised by rich benthic suspension-feeding communities of hard substrates mainly composed of sponges, hydrozoans, scleractinians, antipatharians and gorgonians providing habitat for numerous smaller, mobile invertebrates and hosting an abundant and diversified ichthyofauna (e.g. Samadi et al., 2007). The Mediterranean seamounts have been relatively well investigated from the geological point of view (e.g. Zhuleva, 1988), but few data are available concerning the composition of their megabenthic assemblages. An example is the description of a rich algal community and the mollusc fauna on the top of the Amendolara Bank in the Ionian Sea by dredging program (from 20 m depth) (Cecere & Perrone, 1988). Also the benthic fauna of the top of the Eratosthenes Seamount (750 m depth) was studied by trawl and grab, to the south of Cyprus, in the Eastern Mediterranean Sea (Galil & Zibrowius, 1998). Recently ROV surveys were used to describe the coralligenous assemblages from 80 to 170 m depth on four seamounts along the Spanish coast (Aguiliar et al., 2009). Moreover, the biodiversity of several banks and shoals has been investigated along the continental shelf of the North Tyrrhenian Sea, Sicily Strait, and the Aegean Sea. Studies focusing on deep coral assemblages were made on some rocky shoals along the Calabrian mesophotic zone (Bo et al., 2009) and on the white coral reefs found in the Ionian Sea and mainly composed by the scleractinians Lophelia pertusa and Madrepora oculata. The Tyrrhenian bathyal plain is spotted by at least 14 large and intermediate seamounts. Their peaks are generally several hundred metres beneath the surface of the sea, Vercelli Seamount however, together with Strabo Seamount, are shallow 41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010 100
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Pre-print Volume - Oral presentations<br />
Topic 2: MARINE ORGANISMS AND ECOSYSTEMS AS MODEL SYSTEMS<br />
This phenomenon has to be read not only as a new case of warm-water affinity species<br />
which extends its range north-wards. Its potential is of becoming a new indicator of<br />
Mediterranean Sea meridionalization characterized by cheap and easy monitoring.<br />
Its size and morphological characters allow easy identification. The species can’t be<br />
misidentified with others. It lives in the mesolittoral, most populations can be accessed<br />
without entering the water, therefore no special techniques nor any diving equipment is<br />
needed for observations and collections. However, its reproductive cycle which is the<br />
key factor in its distribution expansion is strictly associated to the sea water<br />
temperature. Last, but not least, the wide latitudinal range of the Italian coastline is<br />
perfect for the study of these phenomena.<br />
Our plans, funding pending, are to establish a richer database of presence data of E.<br />
punctata from the Italian coastline, obtain a wider SST time series, look for a formal<br />
correlation between distribution and temperature data, fully understand the biological<br />
reproductive mechanism of the species (comparing, for example, the time of the gonad<br />
maturation at different latitudes) and the origin of populations (with molecular<br />
markers), define a monitoring protocol and evaluate the possibility of a previsional<br />
model.<br />
References<br />
ALBANO P.G., TRONO D. (2008) – On the occurrence of Echinolittorina punctata (Gmelin, 1791)<br />
(Gastropoda: Littorinidae) in Puglia, South-Eastern Italy. Boll. Malacol., 44 (9-12): 123-126.<br />
ANTIT M., GOFAS S., AZZOUNA A. (2007) – New records of upper shore Mollusca for the<br />
Tunisian coast: newcomers or overlooked? Mar. Biodiv. Rec., 1, published on-line doi:<br />
10.1017/S1755267207000206.<br />
BIANCHI C.N. (2007) – Biodiversity issues for the forthcoming tropical Mediterranean Sea.<br />
Hydrobiologia, 580: 7-21.<br />
D'ANNA G. (1997) – Segnalazione di Nodilittorina punctata (Gmelin, 1791) per Zambrone (Vibo<br />
Valentia). Notiziario SIM, 15 (1-4): 20.<br />
PALANT B., FISHELSON L. (1968) – Littorina punctata (Gmelin) and Littorina neritoides (L.),<br />
(Mollusca, Gastropoda) from Israel: ecology and annual cycle of genital system. Isr. J. Zool., 17:<br />
145-160.<br />
SOPPELSA O., CROCETTA F., FASULO G. (2004) – Prime segnalazioni di Nodilittorina punctata<br />
(Gmelin, 1791) per il Golfo di Salerno, il Golfo di Napoli ed i litorali laziali (Tirreno centromeridionale).<br />
Boll. Soc. Naturalisti Napoli, Nuova Serie, 2 (2003-2004): 41-44.<br />
41 st S.I.B.M. CONGRESS Rapallo (GE), 7-11 June 2010<br />
99
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