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| Titel |
Vertical and longitudinal gradients in HNA-LNA cell abundances and cytometric characteristics in the Mediterranean Sea |
| VerfasserIn |
F. Wambeke, P. Catala, M. Pujo-Pay, P. Lebaron |
| 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 (2011-07-13), S.1853-1863 |
| Datensatznummer |
250006047
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| Publikation (Nr.) |
 copernicus.org/bg-8-1853-2011.pdf |
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| Zusammenfassung |
| Heterotrophic bacterioplankton abundance and production were investigated
with depth (down to bathypelagic layers) and with longitude (from 4.9° E
to 32.7° E) along a cruise track across the Mediterranean Sea in early
summer 2008. Abundances and flow cytometric characteristics (green
fluorescence and side scatter signals) of high nucleic acid (HNA) and low
nucleic acid (LNA) bacterial cells were determined using flow cytometry.
Contrary to what is generally observed, the relative importance of HNA
cells, as a percent of total cells, (%HNA, range 30–69 %) was inversely
related to bacterial production (range 0.15–44 ng C l−1 h−1)
although the negative relation was weak (log–log regression r2=0.19). The
%HNA as well as the mean side scatter of HNA group increased
significantly with depth in the meso and bathypelagic layers. Vertical
stratification played an important role in influencing the distribution and
characteristics of bacterial cells especially with regard to layers located
above, within or below the deep chlorophyll maximum. Within a given layer,
the relationships between the flow cytometric characteristics and environmental
variables such as chlorophyll-a, nutrients or bacterial production changed.
Overall, the relationships between HNA and LNA cells and environmental
parameters differed vertically more than longitudinally. |
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