Microbial diversity and biogeochemistry of the Guaymas Basin deep-sea hydrothermal plume

Gregory J. Dick, Bradley Tebo

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Hydrothermal plumes are hot spots of microbial biogeochemistry in the deep ocean, yet little is known about the diversity or ecology of microorganisms inhabiting plumes. Recent biogeochemical evidence shows that Mn(II) oxidation in the Guaymas Basin (GB) hydrothermal plume is microbially mediated and suggests that the plume microbial community is distinct from deep-sea communities. Here we use a molecular approach to compare microbial diversity in the GB plume and in background deep seawater communities, and cultivation to identify Mn(II)-oxidizing bacteria from plumes and sediments. Despite dramatic differences in Mn(II) oxidation rates between plumes and background seawater, microbial diversity and membership were remarkably similar. All bacterial clone libraries were dominated by Gammaproteobacteria and archaeal clone libraries were dominated by Crenarchaeota. Two lineages, both phylogenetically related to methanotrophs and/or methylotrophs, were consistently over-represented in the plume. Eight Mn(II)-oxidizing bacteria were isolated, but none of these or previously identified Mn(II) oxidizers were abundant in clone libraries. Taken together with Mn(II) oxidation rates measured in laboratory cultures and in the field, these results suggest that Mn(II) oxidation in the GB hydrothermal plume is mediated by genome-level dynamics (gene content and/or expression) of microorganisms that are indigenous and abundant in the deep sea but have yet to be unidentified as Mn(II) oxidizers.

Original languageEnglish (US)
Pages (from-to)1334-1347
Number of pages14
JournalEnvironmental Microbiology
Volume12
Issue number5
DOIs
StatePublished - May 2010

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hydrothermal plume
biogeochemistry
Oceans and Seas
deep sea
Clone Cells
plume
Seawater
basins
oxidation
Crenarchaeota
clones
basin
oxidants
Bacteria
Gammaproteobacteria
clone
seawater
Ecology
microorganisms
methanotrophs

ASJC Scopus subject areas

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Microbial diversity and biogeochemistry of the Guaymas Basin deep-sea hydrothermal plume. / Dick, Gregory J.; Tebo, Bradley.

In: Environmental Microbiology, Vol. 12, No. 5, 05.2010, p. 1334-1347.

Research output: Contribution to journalArticle

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