MBIO 3280 Lecture 24: Habitats - Aquatic
16 Nov 2017
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Document Summary
Exception to the barren landscape on sea floor. Hydrothermal vent fluids are rich in minerals: reduced compound are e- donors for chemolithoautotrophs, support diverse and productive communities. Microbes are free living in surrounding water or grow in biofilms in chimneys or surrounding sediments: some form endosymbioses with tube worms. Black smokers have chimneys of precipitated iron sulfides: walls are full of hyperthermophilic bacteria and archaea, artificial surfaces are colonized by prokaryotes up to about 135 c. Hydrother(cid:373)al ve(cid:374)t fluid (cid:862)food(cid:863: h2, h2s, s(prime elemental), ch4, nh4+, fe2+, other reduced metals. H2 consuming methanogens (co2 in seawater: closer to the source of fluid, where o2 depleted, methanothermus spp. H2 consuming sulfate reducers (so4-2 in seawater : thermodesulfobacterium spp. H2 consuming sulfur reducers: s(prime elemental) accumulates around vents from abiotic sulfide oxidation in. H2 oxidizing bacteria that use o2 as e- acceptor (o2 in seawater) (hydrogen bacteria: hydrogenomonas spp. S(prime elemental) and h2s oxidizers (o2 in seawater: beggiatoa or sulfolobus spp.
