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Science 23 August 1985:
Vol. 229. no. 4715, pp. 717 - 725
DOI: 10.1126/science.229.4715.717
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Articles

Geomicrobiology of Deep-Sea Hydrothermal Vents

Holger W. Jannasch 1 and Michael J. Mottl 2

1 Senior scientist in the Biology Department at Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543.
2 Associate scientist in the Chemistry Department at Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543.

During the cycling of seawater through the earth's crust along the mid-ocean ridge system, geothermal energy is transferred into chemical energy in the form of reduced inorganic compounds. These compounds are derived from the reaction of seawater with crustal rocks at high temperatures and are emitted from warm (le25°C) and hot (sim350°C) submarine vents at depths of 2000 to 3000 meters. Chemolithotrophic bacteria use these reduced chemical species as sources of energy for the reduction of carbon dioxide (assimilation) to organic carbon. These bacteria form the base of the food chain, which permits copious populations of certain specifically adapted invertebrates to grow in the immediate vicinity of the vents. Such highly prolific, although narrowly localized, deep-sea communities are thus maintained primarily by terrestrial rather than by solar energy. Reduced sulfur compounds appear to represent the major electron donors for aerobic microbial metabolism, but methane-, hydrogen-, iron-, and manganese-oxidizing bacteria have also been found. Methanogenic, sulfur-respiring, and extremely thermophilic isolates carry out anaerobic chemosynthesis. Bacteria grow most abundantly in the shallow crust where upwelling hot, reducing hydrothermal fluid mixes with downwelling cold, oxygenated seawater. The predominant production of biomass, however, is the result of symbiotic associations between chemolithotrophic bacteria and certain invertebrates, which have also been found as fossils in Cretaceous sulfide ores of ophiolite deposits.


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