Data/hora: 01/06/2024 02:01:42

Provedor de dados: 	Institutional Archive of Ifreme (ArchiMer)	
País: 	France	
Título: 	Role of environmental factors for the vertical distribution (0-1000 m) of marine bacterial communities in the NW Mediterranean Sea	
Autores: 	Ghiglione, J. F.; Palacios, C.; Marty, J. C.; Mevel, G.; Labrune, C.; Conan, P.; Pujo-pay, M.; Garcia, N.; Goutx, M.	
Data: 	2008-12-16	
Ano: 	2008	
Palavras-chave: 	Free living bacteria; Ribosomal RNA genes; Strand conformation polymorphism; Flame ionization detection; Dissolved organic carbon; 16S RDNA; Microbial diversity; Lipid classes; Phytoplankton dynamics; Multivariate analyses.	
Resumo: 	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 1000m 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 bio-geochemical 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 150m depth.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00208/31974/30409.pdf

DOI:10.5194/bg-5-1751-2008

https://archimer.ifremer.fr/doc/00208/31974/	
Editor: 	Copernicus Publications	
Formato: 	application/pdf	
Fonte: 	Biogeosciences (1726-4170) (Copernicus Publications), 2008-12-16 , Vol. 5 , N. 6 , P. 1751-1764	
Fonte: 	Author(s) 2008. This work is distributed under the Creative Commons Attribution 3.0 License.

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