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"The striking diversity of micro-organisms that can break down hydrocarbons may reflect the early appearance of these compounds as nutrients for microbes in Earth's history; Bacteria and archaea living with hydrocarbons therefore may have appeared early in the evolution of life," said Dr. Widdel.
These bacteria and archaea thrive in the hidden underworld of mud and sediments. You can find them in sunken patches of oil under the sea, in oil and gas seeping out underground, and maybe even in oil reservoirs. Their product, hydrogen sulphide, may nourish an unusual world of simple animal life around such seeps via special symbiotic bacteria.
Scientists have identified particular symbioses between archaea and bacteria that are capable of consuming the greenhouse gas methane before it can escape from the ocean's sediments. Others that have been discovered contribute to the bioremediation or cleaning up of petroleum contaminated water supplies in underground aquifers.
http://www.sciencedaily.com/releases/2008/09/080909204546.htm