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| Titel |
Temperature response of denitrification and anammox reveals the adaptation of microbial communities to in situ temperatures in permeable marine sediments that span 50° in latitude |
| VerfasserIn |
A. Canion, J. E. Kostka, T. M. Gihring, M. Huettel, J. E. E. van Beusekom, H. Gao, G. Lavik, M. M. M. Kuypers |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 2 ; Nr. 11, no. 2 (2014-01-23), S.309-320 |
| Datensatznummer |
250117144
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| Publikation (Nr.) |
 copernicus.org/bg-11-309-2014.pdf |
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| Zusammenfassung |
| Despite decades of research on the physiology and biochemistry of nitrate/nitrite-respiring microorganisms, little is known regarding their metabolic
response to temperature, especially under in situ conditions. The
temperature regulation of microbial communities that mediate anammox and
denitrification was investigated in near shore permeable sediments at polar,
temperate, and subtropical sites with annual mean temperatures ranging from
−5 to 23 °C. Total N2 production rates were determined using
the isotope pairing technique in intact core incubations under diffusive and
simulated advection conditions and ranged from 2 to 359 μmol N m−2 d−1.
For the majority of sites studied, N2 removal was 2–7 times more rapid under simulated advective flow conditions. Anammox
comprised 6–14% of total N2 production at temperate and polar
sites and was not detected at the subtropical site. Potential rates of
denitrification and anammox were determined in anaerobic slurries in a
temperature gradient block incubator across a temperature range of −1 °C
to 42 °C. The highest optimum temperature
(Topt) for denitrification was 36 °C and was observed in
subtropical sediments, while the lowest Topt of 21 °C was
observed at the polar site. Seasonal variation in the Topt was observed
at the temperate site with values of 26 and 34 °C
in winter and summer, respectively. The Topt values for anammox were
9 and 26 °C at the polar and temperate sites,
respectively. The results demonstrate adaptation of denitrifying communities
to in situ temperatures in permeable marine sediments across a wide range of
temperatures, whereas marine anammox bacteria may be predominately
psychrophilic to psychrotolerant. The adaptation of microbial communities to
in situ temperatures suggests that the relationship between temperature and
rates of N removal is highly dependent on community structure. |
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