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| Titel |
Dynamics of nutrients, total organic carbon, prokaryotes and viruses in onboard incubations of cold-water corals |
| VerfasserIn |
C. Maier, A. Kluijver, M. Agis, C. P. D. Brussaard, F. C. Duyl, M. G. Weinbauer |
| 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 ; 8, no. 9 ; Nr. 8, no. 9 (2011-09-14), S.2609-2620 |
| Datensatznummer |
250006124
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| Publikation (Nr.) |
 copernicus.org/bg-8-2609-2011.pdf |
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| Zusammenfassung |
| The potential influence of the cold-water corals (CWCs) Lophelia pertusa and Madrepora oculata on the
dynamics of inorganic nutrient and total organic carbon (TOC) concentrations
and the abundances of prokaryotes and viruses in bottom water was assessed
in onboard incubation experiments. Ammonium, nitrite, dissolved inorganic
nitrogen (DIN), dissolved inorganic phosphorus (DIP) and TOC concentrations
and N:P ratios were typically higher in incubation water with corals than in
controls, whereas nitrate concentrations did not reveal a clear trend. Mucus
release (normalized to coral surface) was estimated by the net increase rate
of TOC concentrations and averaged 23 ± 6 mg C m−2 h−1 for L. pertusa and
21 ± 8 mg C m−2 h−1 for M. oculata. Prokaryotic and viral abundance and
turnover rates were typically stimulated in incubation water with corals.
This estimated prokaryotic stimulation averaged 6.0 ± 3.0 × 109
cells m−2 h−1 for L. pertusa and 8.4 ± 2.9 × 109 cells m−2 h−1
for M. oculata, whereas the estimated viral stimulation averaged 15.6 ± 12.7 × 109 particles m−2 h−1
for L. pertusa and 4.3 ± 0.4 × 109 particles m−2 h−1 M. oculata. Our data suggest that
prokaryotes and viruses are released from corals and that nutrient and mucus
release enhanced prokaryotic and viral production. The result of this
stimulation could be a fuelling of bottom water in CWC reefs with nutrients
and organic matter and consequently an enhancement of microbe-mediated
processes. |
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