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PLoS Biol 2012 Jan 01;101:e1001234. doi: 10.1371/journal.pbio.1001234.
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The discovery of new deep-sea hydrothermal vent communities in the southern ocean and implications for biogeography.

Rogers AD , Tyler PA , Connelly DP , Copley JT , James R , Larter RD , Linse K , Mills RA , Garabato AN , Pancost RD , Pearce DA , Polunin NV , German CR , Shank T , Boersch-Supan PH , Alker BJ , Aquilina A , Bennett SA , Clarke A , Dinley RJ , Graham AG , Green DR , Hawkes JA , Hepburn L , Hilario A , Huvenne VA , Marsh L , Ramirez-Llodra E , Reid WD , Roterman CN , Sweeting CJ , Thatje S , Zwirglmaier K .

Since the first discovery of deep-sea hydrothermal vents along the Galápagos Rift in 1977, numerous vent sites and endemic faunal assemblages have been found along mid-ocean ridges and back-arc basins at low to mid latitudes. These discoveries have suggested the existence of separate biogeographic provinces in the Atlantic and the North West Pacific, the existence of a province including the South West Pacific and Indian Ocean, and a separation of the North East Pacific, North East Pacific Rise, and South East Pacific Rise. The Southern Ocean is known to be a region of high deep-sea species diversity and centre of origin for the global deep-sea fauna. It has also been proposed as a gateway connecting hydrothermal vents in different oceans but is little explored because of extreme conditions. Since 2009 we have explored two segments of the East Scotia Ridge (ESR) in the Southern Ocean using a remotely operated vehicle. In each segment we located deep-sea hydrothermal vents hosting high-temperature black smokers up to 382.8°C and diffuse venting. The chemosynthetic ecosystems hosted by these vents are dominated by a new yeti crab (Kiwa n. sp.), stalked barnacles, limpets, peltospiroid gastropods, anemones, and a predatory sea star. Taxa abundant in vent ecosystems in other oceans, including polychaete worms (Siboglinidae), bathymodiolid mussels, and alvinocaridid shrimps, are absent from the ESR vents. These groups, except the Siboglinidae, possess planktotrophic larvae, rare in Antarctic marine invertebrates, suggesting that the environmental conditions of the Southern Ocean may act as a dispersal filter for vent taxa. Evidence from the distinctive fauna, the unique community structure, and multivariate analyses suggest that the Antarctic vent ecosystems represent a new vent biogeographic province. However, multivariate analyses of species present at the ESR and at other deep-sea hydrothermal vents globally indicate that vent biogeography is more complex than previously recognised.

PubMed ID: 22235194
PMC ID: PMC3250512
Article link: PLoS Biol

Species referenced: Echinodermata
Genes referenced: LOC100887844 LOC100893907 LOC590297 LOC757115 ROCK

Article Images: [+] show captions
References [+] :
Audzijonyte, When gaps really are gaps: statistical phylogeography of hydrothermal vent invertebrates. 2010, Pubmed