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Newly discovered bacterial partnership changes ocean chemistry
Date:8/9/2013

In a discovery that further demonstrates just how unexpected and unusual nature can be, scientists have found two strains of bacteria whose symbiotic relationship is unlike anything seen before.

Long, thin, hairlike Thioploca (meaning "sulfur braids" in Spanish) trichomes form chains down into marine sediment, which tiny anammox cells ride down like an elevator. At the bottom, the anammox cells consume the waste products of the Thioploca: nitrite and ammonium, or "fixed" nitrogen.

Nitrogen is a crucial building block of life, a prerequisite for photosynthesis. While nitrogen is present in abundance in Earth atmosphere, to be useful for most of living organisms, the nonreactive atmospheric nitrogen that diffuses into the ocean from the air must be converted into the biologically available "fixed" forms: ammonium, nitrate and nitrite by specialized organisms called nitrogen fixers. Other organisms use up this fixed nitrogen and convert it back to di-nitrogen gas.

Living together in the mud beneath areas of high plant productivity, Thioploca and anammox intensify this part of the nitrogen cycle.

Gliding down through the mud, Thioploca chains bring down nitrate a highly desirable resource in harsh environment of oxygen-free sediments. As Thioploca encounters sulfide (which is a roadblock for most other bacteria) formed from the reaction of organic matter from above and sea water sulfate, it helps react nitrate with sulfide, producing nitrite and ammonium, which the anammox consumes and churns out di-nitrogen gas.

The anammox cells ride on Thioploca, living off its waste, and so both microbes thrive where others perish. Overall, however, they lock up an important resource for life in the ocean, making it unusable by the organisms at the base of the foodchain that rely on photosynthesis to survive.

"The symbiotic relationship we discovered is an incredibly elegant chemica
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Contact: Robert Perkins
perkinsr@usc.edu
213-740-9226
University of Southern California
Source:Eurekalert

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