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MEPS 542:39-50 (2016)  -  DOI:

Bacterioplankton responses to riverine and atmospheric inputs in a coastal upwelling system (Ría de Vigo, NW Spain)

E. Teira1,2,*, M. Hernández-Ruiz1, E. Barber-Lluch1, C. Sobrino1, I. G. Teixeira2,3, X. A. Álvarez-Salgado3, M. Nieto-Cid3, S. Martínez-García1,4, F. G. Figueiras3, E. Fernández

1Departamento Ecoloxía e Bioloxía Animal, Universidade de Vigo, 36310 Vigo, Spain
2Toralla Marine Station (ECIMAT), Universidad de Vigo, 36331 Vigo, Galicia, Spain
3Instituto de Investigaciones Marinas, CSIC, 36208 Vigo, Spain
4Present address: Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, 39182 Kalmar, Sweden
*Corresponding author:

ABSTRACT: Anthropogenic pressures are changing the magnitude and nature of matter inputs into the ocean. The Ría de Vigo (NW Spain) is a highly productive and dynamic coastal system that is likely affected by such alterations. Previous nutrient-addition microcosm experiments conducted during contrasting hydrographic conditions suggested that heterotrophic bacteria are limited by organic carbon (C) and occasionally co-limited by inorganic nutrients in this coastal area. In order to assess short-term responses in biomass, production, and respiration of heterotrophic bacteria from the Ría de Vigo to increasing amounts of natural inputs of matter, we conducted 6 microcosm experiments, wherein surface seawater collected in spring, summer, and autumn was mixed with increasing amounts of dissolved natural matter concentrates from riverine and atmospheric origin. Simultaneous experiments with controlled inorganic and/or organic additions indicated that bacteria were co-limited by inorganic nutrients and C in spring and summer and primarily limited by C in autumn. Production responded more than biomass to increasing inputs of matter, whereas respiration did not change. The bacterial production response to increasing dissolved organic C load associated with riverine and atmospheric inputs was strongly related to the relative phosphorus (P) content of the dissolved matter concentrates. Our data suggest that bacterial production might decrease with the increase of P-deficient allochthonous matter inputs, which would have important biogeochemical consequences for C cycling in coastal areas.

KEY WORDS: Bacterioplankton · Production · Biomass · Riverine water · Atmospheric deposition · Spain · Galicia · Ría de Vigo

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Cite this article as: Teira E, Hernández-Ruiz M, Barber-Lluch E, Sobrino C and others (2016) Bacterioplankton responses to riverine and atmospheric inputs in a coastal upwelling system (Ría de Vigo, NW Spain). Mar Ecol Prog Ser 542:39-50.

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