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Título

Local differences in phytoplankton-bacterioplankton coupling in the coastal upwelling off Galicia (NW Spain)

AutorTeira, Eva; Hernando-Morales, Víctor; Fernández, Ana; Martínez-García, Sandra; Álvarez-Salgado, Xosé Antón ; Bode, Antonio; Varela, Marta M.
Palabras clavePlanktonic carbon dynamics
Coupling
Heterotrophic bacteria
Phytoplankton
Upwelling
DOC Production
Fecha de publicación2015
EditorInter Research
CitaciónMarine Ecology Progress Series 528: 53-69 (2015)
ResumenWe simultaneously studied microbial-mediated carbon fluxes at 2 contrasting sites within the coastal upwelling system off Galicia, near A Coruña and Vigo, Spain, over an annual cycle in order to compare the fraction of primary production released as dissolved organic carbon (DOC) and the degree of coupling between bacteria and phytoplankton. A significant fraction of primary production was released as DOC at both sites, averaging ~30%. DOC release accounted for, on average, 30% of the total bacterial carbon demand, which is indicative of a moderate trophic dependence of bacteria on phytoplankton in these coastal ecosystems. Nevertheless, differences in hydrographic conditions associated with stronger upwelling pulses off Vigo, and deeper upper mixed layers during the downwelling period off A Coruña, led to significant differences in phytoplankton dynamics and the subsequent direct coupling with heterotrophic bacteria. Strong direct coupling between phytoplankton extracellular release and bacterial production (BP) was found off Vigo, which could be related to the quality of the DOC produced by actively growing phytoplankton. By contrast, DOC release and BP rates were decoupled off A Coruña, likely due to unaccounted DOC associated with indirect trophic processes or to the low availability of freshly produced exudates associated with overflow or photoinhibition mechanisms
Descripción17 páginas, 8 figuras, 2 tablas
Versión del editorhttp://dx.doi.org/10.3354/meps11228
URIhttp://hdl.handle.net/10261/129615
DOI10.3354/meps11228
ISSN0171-8630
E-ISSN1616-1599
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