The first vent fields on the Central Indian Ridge were discovered in 20 ( Gamo et al., 2001 Hashimoto et al., 2001 Van Dover et al., 2001). Over the past 50 years the study of hydrothermal vents has progressed, but most studied vents are located in the Pacific and Atlantic oceans ( German and Von Damm, 2006). The first hydrothermal vent was discovered in 1977 along the Galapagos Rift ( Lonsdale, 1977). Much less is known about hydrothermal vents and the deep sea in general than about terrestrial and shallow-water ecosystems. The addition of 356 sequences strongly increases the number of amphipod barcodes in reference databases and provides for the first time COI barcodes for Cleonardo neuvillei Chevreux, 1908, Haptocallisoma abyssi (Oldevig, 1959), Hirondellea guyoti, Tectovalopsis fusilus Barnard and Ingram, 1990, and the genera Haptocallisoma, Pseudonesimus, and Valettiopsis. Milne Edwards, 1848) and five other already described species in the Indian Ocean. ![]() The present study provides the first report of Eurythenes magellanicus (H. The species Abyssorchomene distinctus (Birstein and Vinogradov, 1960), Hirondellea brevicaudata Chevreux, 1910, and Hirondellea guyoti Barnard and Ingram, 1990, have been previously reported from vent sites in the Atlantic or Pacific oceans. Seven genera, Ambasiopsis, Cleonardo, Eurythenes, Parandania, Pseudonesimus, Tectovalopsis, and Valettiopsis, were observed only at inactive sites, whereas Haptocallisoma, was collected exclusively at active ones. The inactive site, where 19 species were found, showed higher species richness than did the active one, where only 10 taxa were recorded. The existence of potential species complexes was noted for the representatives of the genus Paralicella. By six delimitation methods, 22 molecular operational taxonomic units (MOTUs) belonging to 12 genera and 10 families were defined. Molecular methods included the analysis of two mitochondrial (cytochrome c oxidase subunit I and 16S rRNA) and one nuclear (18S rRNA) genes. A sample consisting of 463 representatives of Amphipoda (Malacostraca: Crustacea) was collected by means of baited traps in active and inactive vents of three different sites and subsequently studied by both morphological and genetic methods. During the survey conducted by the Bundesanstalt für Geowissenschaften und Rohstoffe (Federal Institute for Geosciences and Natural Resources, BGR) to identify inactive polymetallic sulfide deposits along Central and Southeast Indian Ridges, the INDEX project studied the scavenging amphipod community at three newly discovered hydrothermal fields. Because of chemoautotrophic bacteria, they possess high abundances of vent endemic species as well as many non-vent species around the fields. ![]() ![]() Hydrothermal vent areas have drawn increasing interest since they were discovered in 1977. 4INES Integrated Environmental Solutions UG, Wilhelmshaven, Germany.3Department of Invertebrate Zoology and Hydrobiology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland.2Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany.1Senckenberg am Meer, German Centre for Marine Biodiversity Research, Wilhelmshaven, Germany.Katharina Kniesz 1,2*, Anna Maria Jażdżewska 3, Pedro Martínez Arbizu 1,2 and Terue Cristina Kihara 4
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