HR: 14:55h
AN: B42C-06    [PDF]
TI: Microbial community structures in methane hydrate baring deep marine sediments from the Peru Margin (ODP Leg. 201) and the Cascadia Margin (ODP Leg. 204)
AU: * Inagaki, F
EM: inagaki@jamstec.go.jp
AF: Subground Animalcule Retrieval (SUGAR) Project, Frontier Research System for Extremophiles, JAMSTEC, 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Nunoura, T
EM: takuron@jamstec.go.jp
AF: Subground Animalcule Retrieval (SUGAR) Project, Frontier Research System for Extremophiles, JAMSTEC, 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Suzuki, M
EM: masaes@jamstec.go.jp
AF: Subground Animalcule Retrieval (SUGAR) Project, Frontier Research System for Extremophiles, JAMSTEC, 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Takai, K
EM: kent@jamstec.go.jp
AF: Subground Animalcule Retrieval (SUGAR) Project, Frontier Research System for Extremophiles, JAMSTEC, 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Nealson, K H
EM: knealson@usc.edu
AF: Subground Animalcule Retrieval (SUGAR) Project, Frontier Research System for Extremophiles, JAMSTEC, 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Nealson, K H
EM: knealson@usc.edu
AF: Department of Earth Sciences, University of Southern California, 3651 Trousdale Pkwy., Los Angels, LA 90089-0740 United States
AU: Horikoshi, K
EM: horikoshik
AF: Subground Animalcule Retrieval (SUGAR) Project, Frontier Research System for Extremophiles, JAMSTEC, 2-15 Natsushima-cho, Yokosuka, 237-0061 Japan
AU: Delwiche, M
EM: mde1@inel.gov
AF: Biotechnology, INEEL, P.O.Box 1625, Idaho Falls, ID 83415-2203 United States
AU: Colwell, F S
EM: fxc@inel.gov
AF: Biotechnology, INEEL, P.O.Box 1625, Idaho Falls, ID 83415-2203 United States
AU: Jorgensen, B B
EM: bjoergen@mpi-bremen.de
AF: Biogeochemistry Department, Max-Planck-Institute for Marine Microbiology, Celsiusstrasse 1, Bremen, D-28359 Germany
AB: Current estimates of biomass in deep subseafloor sediments recovered by the Ocean Drilling Program (ODP) have lead to the conclusion that the subseafloor environment potentially represents the largest biosphere on Earth. However, neither the microbial diversity and distribution that live there nor the relationship between metabolic characteristics and geological, geochemical settings are poorly understood yet. We present here the vertical profiles of microbial community structures occurring in methane hydrate baring subseafloor sediments collected from the Peru Margin (ODP Leg 201, site 1230) and Cascadia Margin (ODP Leg 204, sites 1244, 1245, 1251). Organic rich marine sediment core lacking methane hydrates obtained from the Peru Margin (ODP Leg 201, site 1227) was also investigated as a reference site. Quantitative-PCR analysis of archaeal rDNA population and molecular phylogenetic analyses of over 3,000 archaeal and bacterial 16S rDNA clones were demonstrated vertically through the ODP sediment core columns, comparing with data from geochemical analyses. On the basis of the results from microbiology and geochemistry, we discuss the relationship between the distribution of previously unknown microbial communities and the potential source of biogenic methane associated with the formation of hydrates in two geologically discrete deep-subseafloor environments.
DE: 4803 Bacteria
DE: 4805 Biogeochemical cycles (1615)
DE: 4825 Geochemistry
DE: 4840 Microbiology
SC: Biogeosciences [B]
MN: 2003 Fall Meeting