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- W2068192471 abstract "Water availability oscillates dramatically on young volcanic deposits, and may control the distribution and activity of microbes during early stages of biological succession. Carbon monoxide (CO)-oxidizing bacteria are among the pioneering colonists on volcanic deposits and are subjected to these water stresses. We report here the effects of water potential on CO-oxidizing bacteria in unvegetated (bare) and vegetated (canopy) sites on a 1959 volcanic deposit on Kilauea Volcano (Hawai'i). Time course measurements of water potential showed that average water potentials in the surface layer (0-1 cm) of canopy soil remained between -0.1 and 0 MPa, whereas dramatic diurnal oscillations (for example, between -60 and 0 MPa) occur in bare site surface cinders. During a moderate drying event in situ (-1.7 to 0 MPa), atmospheric CO consumption by intact bare site cores decreased 2.7-fold. For bare and canopy surface samples, maximum potential CO oxidation rates decreased 40 and 60%, respectively, when water potentials were lowered from 0 to -1.5 MPa in the laboratory. These observations indicated that CO oxidation is moderately sensitive to changes in water potential. Additional analyses showed that CO oxidation resumes within a few hours of rehydration, even after desiccation at -150 MPa for 63 days. Samples from both sites exposed to multiple cycles of drying and rewetting (-80 to 0 MPa), lost significant activity after the first cycle, but not after subsequent cycles. Similar responses of CO oxidation in both sites suggested that active CO-oxidizing communities in bare and canopy sites do not express differential adaptations to water stress." @default.
- W2068192471 created "2016-06-24" @default.
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- W2068192471 date "2009-07-30" @default.
- W2068192471 modified "2023-10-16" @default.
- W2068192471 title "Water stress impacts on bacterial carbon monoxide oxidation on recent volcanic deposits" @default.
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- W2068192471 doi "https://doi.org/10.1038/ismej.2009.70" @default.
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