Scientia Marina, Vol 67, No 2 (2003)

Variations in planktonic bacterial biomass and production and phytoplankton blooms off A Coruña (NW Spain)


https://doi.org/10.3989/scimar.2003.67n2143

Joaquín Valencia
Departamento de Biología Celular y Molecular, Universidad de A Coruña, Spain

Instituto Español de Oceanografía, Centro Oceanográfico de Baleares, Palma de Mallorca

Julio Abalde
Departamento de Biología Celular y Molecular, Universidad de A Coruña, Spain

Antonio Bode
Instituto Español de Oceanografía, Centro Oceanográfico de A Coruña, Spain

Angeles Cid
Departamento de Biología Celular y Molecular, Universidad de A Coruña, Spain

Emilio Fernández
Departamento de Biología Animal y Ecología, Universidad de Vigo, Spain

Nicolás González
Instituto Español de Oceanografía, Centro Oceanográfico de A Coruña, Spain

Jorge Lorenzo
Instituto Español de Oceanografía, Centro Oceanográfico de A Coruña, Spain

Eva Teira
Departamento de Biología Animal y Ecología, Universidad de Vigo, Spain

Manuel Varela
Instituto Español de Oceanografía, Centro Oceanográfico de A Coruña, Spain

Abstract


Bacterial abundance, biomass and heterotrophic activity, along with hydrographic and phytoplankton variables, were measured from February 1998 to September 1999 at two coastal stations off A Coruña (Galicia, NW Spain). Bacterial abundance varied from 0.1 to 1.8 x 106 cells ml-1 and water-column integrated bacterial production ranged from 34 to 1132 mg C m-2 d-1. Two annual maxima of bacterial abundance and production were observed, in spring and summer, although relatively high abundance values remained until autumn. In autumn and winter production values were low with the exception of the results obtained in November 1998, when the highest values of bacterial production of the whole study were observed at both stations. Bacterial biomass constituted a significant, but low, fraction of particulate organic carbon (4-21 %) and was always lower than phytoplankton biomass (up to 40% of phytoplankton carbon). Also, bacterial production was generally < 30% of primary production, but in some situations (as in early spring or in autumn) bacterial production exceeded primary production, suggesting a delayed response of bacterial activity after a phytoplankton bloom.

Keywords


bacterial production; bacterial abundance; phytoplankton biomass; primary production; phytoplankton blooms; NW Spain

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