Por favor, use este identificador para citar o enlazar a este item:
Compartir / Impacto:
|Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL|
Heterotrophic bacterial responses to the winter-spring phytoplankton bloom in open waters of the NW Mediterranean
|Autor:||Gomes, Ana ; Gasol, Josep M. ; Estrada, Marta ; Franco-Vidal, Leticia; Díaz-Pérez, Laura; Ferrera, Isabel ; Morán, Xosé Anxelu G.|
|Palabras clave:||Bacterial production|
|Fecha de publicación:||feb-2015|
|Citación:||Deep-Sea Research Part I: Oceanographic Research Papers 96: 59-68 (2015)|
|Resumen:||The 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.|
|Descripción:||10 pages, 5 figures, 5 tables|
|Versión del editor:||http://dx.doi.org/10.1016/j.dsr.2014.11.007|
|Aparece en las colecciones:||(ICM) Artículos|
Ficheros en este ítem:
No hay ficheros asociados a este ítem.
Mostrar el registro completo
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.