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Heterotrophic bacterial responses to the winter-spring phytoplankton bloom in open waters of the NW Mediterranean

AutorGomes, Ana ; Gasol, Josep M. ; Estrada, Marta ; Franco-Vidal, Leticia; Díaz-Pérez, Laura; Ferrera, Isabel ; Morán, Xosé Anxelu G.
Palabras claveBacterial production
Primary production
Phytoplankton-bacterioplankton coupling
Winter-spring bloom
Fecha de publicaciónfeb-2015
EditorPergamon Press
CitaciónDeep-Sea Research Part I: Oceanographic Research Papers 96: 59-68 (2015)
ResumenThe response of planktonic heterotrophic prokaryotes to the NW Mediterranean winter-spring offshore phytoplankton bloom was assessed in 3 cruises conducted in March, April-May and September 2009. Bulk measurements of phytoplankton and bacterioplankton biomass and production were complemented with an insight into bacterial physiological structure by single-cell analysis of nucleic acid content [low (LNA) vs. high (HNA)] and membrane integrity (>Live> vs. >Dead> cells). Bacterial production empirical conversion factors (0.82±0.25SEkgCmolleucine-1) were almost always well below the theoretical value. Major differences in most microbial variables were found among the 3 periods, which varied from extremely high phytoplankton biomass and production during the bloom in March (>1gCm-2d-1 primary production) to typically oligotrophic conditions during September stratification (<200mgCm-2d-1). In both these periods bacterial production was ~30mgCm-2d-1 while very large bacterial production (mean 228, with some stations exceeding 500mgCm-2d-1) but low biomass was observed during the April-May post-bloom phase. The contribution of HNA (30-67%) and >Live> cells (47-97%) were temporally opposite in the study periods, with maxima in March and September, respectively. Different relationships were found between physiological structure and bottom-up variables, with HNA bacteria apparently more responsive to phytoplankton only during the bloom, coinciding with larger average cell sizes of LNA bacteria. Moderate phytoplankton-bacterioplankton coupling of biomass and activity was only observed in the bloom and post-bloom phases, while relationships between both compartments were not significant under stratification. With all data pooled, bacteria were only weakly bottom-up controlled. Our analyses show that the biomass and production of planktonic algae and bacteria followed opposite paths in the transition from bloom to oligotrophic conditions. © 2014 Elsevier Ltd.
Descripción10 pages, 5 figures, 5 tables
Versión del editorhttp://dx.doi.org/10.1016/j.dsr.2014.11.007
Identificadoresdoi: 10.1016/j.dsr.2014.11.007
issn: 0967-0637
e-issn: 1879-0119
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