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| Titel |
The percentage of living bacterial cells related to organic carbon release from senescent oceanic phytoplankton |
| VerfasserIn |
S. Lasternas, S. Agustí  |
| 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. 22 ; Nr. 11, no. 22 (2014-11-26), S.6377-6387 |
| Datensatznummer |
250117689
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| Publikation (Nr.) |
 copernicus.org/bg-11-6377-2014.pdf |
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| Zusammenfassung |
| Bacteria recycle vast amounts of organic carbon, playing key biogeochemical
and ecological roles in the ocean. Bacterioplankton dynamics are expected to
be dependent on phytoplankton primary production, but there is a high
diversity of processes (e.g., sloppy feeding, cell exudation, viral lysis)
involved in the transfer of primary production to dissolved organic carbon
available to bacteria. Here, we show the percentage of living heterotrophic
bacterioplankton in the subtropical NE Atlantic Ocean in relation to
phytoplankton extracellular carbon release (PER). PER represents the fraction
of primary production released as dissolved organic carbon. PER variability
was explained by phytoplankton cell death, with communities experiencing
higher phytoplankton cell mortality showing a larger proportion of
phytoplankton extracellular carbon release. Both PER and the percentage of
dead phytoplankton cells increased from eutrophic to oligotrophic waters,
while abundance of heterotrophic bacteria was highest in the intermediate
waters. The percentage of living heterotrophic bacterial cells (range:
60–95%) increased with increasing phytoplankton extracellular carbon
release from productive to oligotrophic waters in the subtropical NE
Atlantic. The lower PERs, observed at the upwelling waters, have resulted in
a decrease in the flux of phytoplankton dissolved organic carbon (DOC) per
bacterial cell. The results highlight phytoplankton cell death as a process
influencing the flow of dissolved photosynthetic carbon in this region of the
subtropical NE Atlantic Ocean, and suggest a close coupling between the
fraction of primary production released and heterotrophic bacterial cell
survival. |
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