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| Titel |
Role of environmental factors for the vertical distribution (0–1000 m) of marine bacterial communities in the NW Mediterranean Sea |
| VerfasserIn |
J. F. Ghiglione, C. Palacios, J. C. Marty, G. Mével, C. Labrune, P. Conan, M. Pujo-Pay, N. Garcia, M. Goutx |
| 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 ; 5, no. 6 ; Nr. 5, no. 6 (2008-12-16), S.1751-1764 |
| Datensatznummer |
250002939
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| Publikation (Nr.) |
 copernicus.org/bg-5-1751-2008.pdf |
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| Zusammenfassung |
| Bacterioplankton plays a central role in energy and matter fluxes in the
sea, yet the factors that constrain its variation in marine systems are
still poorly understood. Here we use the explanatory power of direct
multivariate gradient analysis to evaluate the driving forces exerted by
environmental parameters on bacterial community distribution in the water
column. We gathered and analysed data from a one month sampling period from
the surface to 1000 m depth at the JGOFS-DYFAMED station (NW Mediterranean
Sea). This station is characterized by very poor horizontal advection
currents which makes it an ideal model to test hypotheses on the causes of
vertical stratification of bacterial communities. Capillary electrophoresis
single strand conformation polymorphism (CE-SSCP) fingerprinting profiles
analyzed using multivariate statistical methods demonstrated a vertical
zonation of bacterial assemblages in three layers, above, in or just below
the chlorophyll maximum and deeper, that remained stable during the entire
sampling period. Through the use of direct gradient multivariate ordination
analyses we demonstrate that a complex array of biogeochemical parameters is
the driving force behind bacterial community structure shifts in the water
column. Physico-chemical parameters such as phosphate, nitrate, salinity and
to a lesser extent temperature, oxygen, dissolved organic carbon and
photosynthetically active radiation acted in synergy to explain bacterial
assemblages changes with depth. Analysis of lipid biomarkers of organic
matter sources and fates suggested that bacterial community structure in the
surface layers was in part explained by lipids of chloroplast origin.
Further detailed analysis of pigment-based phytoplankton diversity gave
evidence of a compartmentalized influence of several phytoplankton groups on
bacterial community structure in the first 150 m depth. |
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