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Use of carbon monoxide and hydrogen by a bacteria–animal symbiosis from seagrass sediments
Author(s) -
Kleiner Manuel,
Wentrup Cecilia,
Holler Thomas,
Lavik Gaute,
Harder Jens,
Lott Christian,
Littmann Sten,
Kuypers Marcel M. M.,
Dubilier Nicole
Publication year - 2015
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.12912
Subject(s) - seagrass , seawater , environmental chemistry , biology , symbiosis , sediment , carbon monoxide , carbon fibers , sulfur , biomass (ecology) , ecology , bacteria , chemistry , materials science , ecosystem , paleontology , biochemistry , organic chemistry , composite number , composite material , catalysis
Summary The gutless marine worm O lavius algarvensis lives in symbiosis with chemosynthetic bacteria that provide nutrition by fixing carbon dioxide ( CO 2 ) into biomass using reduced sulfur compounds as energy sources. A recent metaproteomic analysis of the O . algarvensis symbiosis indicated that carbon monoxide ( CO ) and hydrogen ( H 2 ) might also be used as energy sources. We provide direct evidence that the O . algarvensis symbiosis consumes CO and H 2 . Single cell imaging using nanoscale secondary ion mass spectrometry revealed that one of the symbionts, the γ3‐symbiont, uses the energy from CO oxidation to fix CO 2 . Pore water analysis revealed considerable in‐situ concentrations of CO and H 2 in the O . algarvensis environment, Mediterranean seagrass sediments. Pore water H 2 concentrations (89–2147 nM) were up to two orders of magnitude higher than in seawater, and up to 36‐fold higher than previously known from shallow‐water marine sediments. Pore water CO concentrations (17–51 nM) were twice as high as in the overlying seawater (no literature data from other shallow‐water sediments are available for comparison). Ex‐situ incubation experiments showed that dead seagrass rhizomes produced large amounts of CO . CO production from decaying plant material could thus be a significant energy source for microbial primary production in seagrass sediments.