Local differences in phytoplankton−bacterioplankton coupling in the coastal upwelling off Galicia (NW Spain).
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AuthorsTeira, E. (Eva); Hernando-Morales, V. (Víctor); Fernández, Ana; Martínez-García, S.; Álvarez-Salgado, X.A. (Xosé Antón); Bode, A. (Antonio); Varela, M.M. (Marta María)
KeywordsPlanktonic carbon dynamics · Coupling · Heterotrophic bacteria · Phytoplankton ·
We 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 ac counted 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 ...
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