caa a22 4500 445818794 CHVBK 20180317145237.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00792-010-0346-z doi (NATIONALLICENCE)springer-10.1007/s00792-010-0346-z Chemosynthetic activity prevails in deep-sea sediments of the Central Indian Basin [Elektronische Daten] [Anindita Das, P. Sujith, Babu Shashikant Mourya, Sushanta Biche, P. LokaBharathi] It is hypothesized that in the deep-sea, under psychrophilic, barophilic and oligotrophic conditions, microbial community of Central Indian Basin (CIB) sediments could be chemosynthetic. In the dark, at near ambient temperature, 4±2°C, 500atm pressure, pelagic red clay could fix carbon at rates ranging from 100 to 500nmolCg−1drywtday−1. These clays accumulate in the deepest and the most remote areas of the ocean and contain <30% biogenic material. These clays with volcanic signatures fixed 230-9,401nmolCg−1drywtday−1 while siliceous radiolarian oozes of the basin fixed only 5-45nmolCg−1drywtday−1. These rates are comparable to those of white smoker waters and are 1-4 orders of magnitude less than those of bacterial mats and active vents recorded at other localities worldwide. The experimental ratios of carbon fixation to metal oxidation in the sediments were 0-1 order of magnitude higher than the corresponding average theoretical ratio of 0.0215 (0.0218, 0.0222, 0.0207 and 0.0211 for Fe, Mn, Co and Ni, respectively) in the siliceous ooze. In case of pelagic red clay it was 0-2 orders higher than theoretical ratio. Thus, chemosynthetic activity could be more widespread, albeit at low rates, than previously considered for abyssal basins. These environments may be dependent partially or even wholly on in situ microbial primary production for their carbon requirements rather than on photosynthetically derived detritus from surface waters. Springer, 2010 Chemosynthesis nationallicence Metal oxidation nationallicence Bacteria nationallicence Bioenergetics nationallicence Central Indian Basin nationallicence Das Anindita Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut Sujith P. Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut Shashikant Mourya Babu Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut Biche Sushanta Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut LokaBharathi P. Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut Extremophiles Springer Japan 15/2(2011-03-01), 177-189 1431-0651 15:2<177 2011 15 792 https://doi.org/10.1007/s00792-010-0346-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00792-010-0346-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Das Anindita Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut NATIONALLICENCE 700 1- Sujith P. Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut NATIONALLICENCE 700 1- Shashikant Mourya Babu Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut NATIONALLICENCE 700 1- Biche Sushanta Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut NATIONALLICENCE 700 1- LokaBharathi P. Biological Oceanography, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut NATIONALLICENCE 773 0- Extremophiles Springer Japan 15/2(2011-03-01), 177-189 1431-0651 15:2<177 2011 15 792 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer