comparing deep-sea fish fauna between coral and non-coral “megahabitats” in the santa maria di leuca cold-water coral province (mediterranean sea)比较之间的深海鱼类动物珊瑚和non-coralu201cmegahabitatsu201d圣玛丽亚迪leuca冷水珊瑚省(地中海).pdfVIP

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comparing deep-sea fish fauna between coral and non-coral “megahabitats” in the santa maria di leuca cold-water coral province (mediterranean sea)比较之间的深海鱼类动物珊瑚和non-coralu201cmegahabitatsu201d圣玛丽亚迪leuca冷水珊瑚省(地中海).pdf

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comparing deep-sea fish fauna between coral and non-coral “megahabitats” in the santa maria di leuca cold-water coral province (mediterranean sea)比较之间的深海鱼类动物珊瑚和non-coralu201cmegahabitatsu201d圣玛丽亚迪leuca冷水珊瑚省(地中海)

Comparing Deep-Sea Fish Fauna between Coral and Non-Coral ‘‘Megahabitats’’ in the Santa Maria di Leuca Cold-Water Coral Province (Mediterranean Sea) Gianfranco D’Onghia*, Porzia Maiorano, Roberto Carlucci, Francesca Capezzuto, Angela Carluccio, Angelo Tursi, Letizia Sion Department of Biology, University of Bari ‘‘Aldo Moro’’, CoNISMa, Bari, Italy Abstract Two experimental longline surveys were carried out in the Santa Maria di Leuca (SML) cold-water coral province (Mediterranean Sea) during May–June and September–October 2010 to investigate the effect of corals on fish assemblages. Two types of ‘‘megahabitat’’ characterized by the virtual absence of fishing were explored. One was characterized by complex topography including mesohabitats with carbonate mounds and corals. The other type of megahabitat, although characterized by complex topographic features, lacks carbonate mounds and corals. The fishing vessel was equipped with a 3,000 m monofilament longline with 500 hooks and snoods of 2.5 m in length. A total of 9 hauls, using about 4,500 hooks, were carried out both in the coral megahabitat and in the non-coral megahabitat during each survey. The fish Leucoraja fullonica and Pteroplatytrygon violacea represent new records for the SML coral province. The coral by-catch was only obtained in the coral megahabitat in about 55% of the stations investigated in both surveys. The total catches and the abundance indices of several species were comparable between the two habitat typologies. The species contributing most to the dissimilarity between the two megahabitat fish assemblages were Pagellus bogaraveo, Galeus melastomus, Etmopterus spinax and Helicolenus dactylopterus for density and P. bogaraveo, Conger conger, Polyprion americanus and G. melastomus for biomass. P. bogaraveo was exclusively collected