Microbial Diversity in Deep Subsurface of South Pacific Gyre

Abstract

Microbial life in deep marine subsurface has not well understood. Due by low surface productivity and deep water depth precipitate from upper water column to the sediment surface in South Pacific Gyre (SPG) was very low and make harsh environments for microorganisms. In autumn of 2010 several sediment cores including longer than a hundred meter were obtained from SGP via IODP (Integrated Ocean Drilling Program) Expedition 329 and basic geological, geochemical, and microbiological studies had been conducted. Here, we analyzed microbial diversity of 3 sediment cores (U1365, U1370, and U1371) from SGP based on different geochemical characteristics (U1371 received large amounts of organic precipitates compared to others and consequently anoxic from 2.5 m-bsf). Briefly, members of Chloroflexi, especially Dehalococcoidiaceae were predominant in organic rich or anoxic area of sediments in the sediment environment of South Pacific Gyre.onments for microorganisms. In autumn of 2010 several sediment cores including longer than a hundred meter were obtained from SGP via IODP (Integrated Ocean Drilling Program) Expedition 329 and basic geological, geochemical, and microbiological studies had been conducted. Here, we analyzed microbial diversity of 3 sediment cores (U1365, U1370, and U1371) from SGP based on different geochemical characteristics (U1371 received large amounts of organic precipitates compared to others and consequently anoxic from 2.5 m-bsf). Briefly, members of Chloroflexi, especially Dehalococcoidiaceae were predominant in organic rich or anoxic area of sediments in the sediment environment of South Pacific Gyre.