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Response of Alteromonadaceae and Rhodobacteriaceae to glucose and phosphorus manipulation in marine mesocosms

Autor Allers, Elke; Gómez-Consarnau, Laura; Pinhassi, Jarone; Gasol, Josep M. ; Šimek, Karel; Pernthaler, Jakob
Fecha de publicación oct-2007
EditorSociety for Applied Microbiology
Citación Environmental Microbiology 9(10): 2417-2429 (2007)
ResumenMicrobial successions were studied in experimental mesocosms of marine water in the presence of additional organic carbon (glucose), phosphorus (P) or both. P addition lead to pronounced blooms of phytoplankton and to significantly enhanced bacterial production. Characteristic succession patterns were observed for two phylogenetic groups of bacteria that both transiently formed > 50% of total cells. An initial bloom of bacteria affiliated to the Alteromonadaceae could not be assigned to any specific treatment and was interpreted as a response to the manipulations during mesocosm set-up. These bacteria rapidly declined with the appearance of heterotrophic nanoflagellates, suggesting a negative effect of selective grazing. The persistence of Alteromonadaceae in the microbial assemblages was significantly favored by the presence of additional glucose. During the second half of the experiment, bacteria affiliated to Rhodobacteriaceae formed a dominant component of the experimental assemblages in treatments with addition of P. The community contribution of Rhodobacteriaceae was significantly correlated with chlorophyll a concentrations only in the P-amended mesocosms (r2 = 0.58). This was more pronounced in the absence of glucose (r2 = 0.85). The phylogenetic and morphological diversity among Rhodobacteriaceae was high, and treatment-specific temporal successions of genotypes related to Rhodobacteriaceae were observed. We suggest that the observed succession patterns reflect different niche preferences: Alteromonadaceae rapidly responded to disturbance and profited from allochthonous glucose input, whereas Rhodobacteriaceae benefited from the phytoplankton bloom. © 2007 The Authors
Descripción 13 pages, 6 figures, 2 tables, supplementary material http://onlinelibrary.wiley.com/doi/10.1111/j.1462-2920.2007.01360.x/suppinfo
Versión del editorhttp://dx.doi.org/10.1111/j.1462-2920.2007.01360.x
URI http://hdl.handle.net/10261/108249
Identificadoresdoi: 10.1111/j.1462-2920.2007.01360.x
issn: 1462-2912
e-issn: 1462-2920
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