FN Archimer Export Format PT J TI Deep-Sea Biodiversity in the Mediterranean Sea: The Known, the Unknown, and the Unknowable BT AF DANOVARO, Roberto BATISTA COMPANY, Joan CORINALDESI, Cinzia D'ONGHIA, Gianfranco GALIL, Bella GAMBI, Cristina GOODAY, Andrew J. LAMPADARIOU, Nikolaos LUNA, Gian Marco MORIGI, Caterina OLU, Karine POLYMENAKOU, Paraskevi RAMIREZ-LLODRA, Eva SABBATINI, Anna SARDA, Francesc SIBUET, Myriam TSELEPIDES, Anastasios AS 1:1;2:2;3:1;4:3;5:4;6:1;7:5;8:6;9:1;10:7;11:8;12:6;13:2;14:1;15:2;16:9;17:10; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:PDG-DOP-DCB-EEP-LEP;12:;13:;14:;15:;16:;17:; C1 Univ Politecn Marche, Dipartimento Sci Mare, Ancona, Italy. CSIC, Inst Ciencias Mar, Barcelona, Spain. Univ Bari, Dept Anim & Environm Biol, Bari, Italy. Natl Inst Oceanog, IL-31080 Haifa, Israel. Natl Oceanog Ctr, Southampton, Hants, England. Hellen Ctr Marine Res, Iraklion, Greece. Geol Survey Denmark & Greenland, Stratig Dept, Copenhagen, Denmark. IFREMER, Ctr Brest, Dept Etude Ecosyst Profonds, Plouzane, France. Inst Oceanog, Paris, France. Univ Piraeus, Dept Maritime Studies, Piraeus, France. C2 UNIV POLITECN MARCHE, ITALY CSIC, SPAIN UNIV BARI, ITALY NATL INST OCEANOG HAIFA, ISRAEL NOC, UK HELLEN CTR MARINE RES, GREECE GEOL SURVEY DENMARK & GREENLAND, DENMARK IFREMER, FRANCE INST OCEANOG, FRANCE UNIV PIRAEUS, GREECE SI BREST SE PDG-DOP-DCB-EEP-LEP IN WOS Ifremer jusqu'en 2018 copubli-france copubli-europe copubli-univ-france copubli-int-hors-europe IF 4.411 TC 221 UR https://archimer.ifremer.fr/doc/00011/12206/8974.pdf LA English DT Article AB Deep-sea ecosystems represent the largest biome of the global biosphere, but knowledge of their biodiversity is still scant. The Mediterranean basin has been proposed as a hot spot of terrestrial and coastal marine biodiversity but has been supposed to be impoverished of deep-sea species richness. We summarized all available information on benthic biodiversity (Prokaryotes, Foraminifera, Meiofauna, Macrofauna, and Megafauna) in different deep-sea ecosystems of the Mediterranean Sea (200 to more than 4,000 m depth), including open slopes, deep basins, canyons, cold seeps, seamounts, deep-water corals and deep-hypersaline anoxic basins and analyzed overall longitudinal and bathymetric patterns. We show that in contrast to what was expected from the sharp decrease in organic carbon fluxes and reduced faunal abundance, the deep-sea biodiversity of both the eastern and the western basins of the Mediterranean Sea is similarly high. All of the biodiversity components, except Bacteria and Archaea, displayed a decreasing pattern with increasing water depth, but to a different extent for each component. Unlike patterns observed for faunal abundance, highest negative values of the slopes of the biodiversity patterns were observed for Meiofauna, followed by Macrofauna and Megafauna. Comparison of the biodiversity associated with open slopes, deep basins, canyons, and deep-water corals showed that the deep basins were the least diverse. Rarefaction curves allowed us to estimate the expected number of species for each benthic component in different bathymetric ranges. A large fraction of exclusive species was associated with each specific habitat or ecosystem. Thus, each deep-sea ecosystem contributes significantly to overall biodiversity. From theoretical extrapolations we estimate that the overall deep-sea Mediterranean biodiversity (excluding prokaryotes) reaches approximately 2805 species of which about 66% is still undiscovered. Among the biotic components investigated (Prokaryotes excluded), most of the unknown species are within the phylum Nematoda, followed by Foraminifera, but an important fraction of macrofaunal and megafaunal species also remains unknown. Data reported here provide new insights into the patterns of biodiversity in the deep-sea Mediterranean and new clues for future investigations aimed at identifying the factors controlling and threatening deep-sea biodiversity. PY 2010 PD AUG SO Plos One SN 1932-6203 PU Public Library Science VL 5 IS 8 UT 000280520400006 DI 10.1371/journal.pone.0011832 ID 12206 ER EF