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| Titel |
Microbial food webs and metabolic state across oligotrophic waters of the Mediterranean Sea during summer |
| VerfasserIn |
U. Christaki, F. Wambeke, D. Lefèvre, A. Lagaria, L. Prieur, M. Pujo-Pay, J.-D. Grattepanche, J. Colombet, S. Psarra, J. R. Dolan, T. Sime-Ngando, P. Conan, M. G. Weinbauer, T. Moutin |
| 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. 7 ; Nr. 8, no. 7 (2011-07-12), S.1839-1852 |
| Datensatznummer |
250006046
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| Publikation (Nr.) |
 copernicus.org/bg-8-1839-2011.pdf |
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| Zusammenfassung |
| The abundance and activity of the major members of the
heterotrophic microbial community – from viruses to ciliates – were
studied along a longitudinal transect across the Mediterranean Sea in the
summer of 2008. The Mediterranean Sea is characterized by a west to-east gradient of deepening of DCM (deep chlorophyll maximum) and increasing
oligotrophy reflected in gradients of biomass and production. However,
within this well documented longitudinal trend, hydrological mesoscale
features exist and likely influence microbial dynamics. Here we present data
from a W-E transect of 17 stations during the period of summer
stratification. Along the transect the production and fate of organic matter
was investigated at three selected sites each one located in the centre of
an anticyclonic eddy: in the Algero-Provencal Basin (St. A), the Ionian
Basin (St. B), and the Levantine Basin (St. C). The 3 geographically distant
eddies showed low values of the different heterotrophic compartments of the
microbial food web, and except for viruses in site C, all integrated
(0–150 m) stocks were higher in reference stations located in the same basin
outside the eddies. During our study the 3 eddies showed equilibrium between
GPP (Gross Primary Production) and DCR (Dark Community Respiration).
Integrated PPp (Particulate Primary Production) values at A, B and C varied
from ~140 to ~190 mg C m−2. |
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