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Título: | Microbial plankton community in the Ria de Vigo (NW Iberian upwelling system): Impact of the culture of Mytilus galloprovincialis |
Autor: | Froján, M. CSIC ORCID; Arbones, Belén CSIC ORCID; Zúñiga, Diana CSIC; Castro, Carmen G. CSIC ORCID; Figueiras, F. G. CSIC ORCID | Palabras clave: | Microbial plankton Size structure Mytilus galloprovincialis Mussel impact Coastal upwelling NW Iberia |
Fecha de publicación: | 2014 | Editor: | Inter Research | Citación: | Marine Ecology Progress Series 498: 43-54 (2014) | Resumen: | Variability in size structure and composition of the microbial plankton community in the Ría de Vigo (NW Iberian coastal upwelling system) was studied as a function of the prevailing oceanographic conditions during 4 seasonal sampling periods (autumn, winter, spring and summer). The impact of mussel culture on this microbial plankton community was also evaluated by comparing the results obtained at a reference station (ReS) located outside the farming area with those found inside the farming area (raft station, RaS). Integrated microbial plankton biomass remained relatively constant (2.5 ± 0.4 g C m–2) at ReS during autumn, spring and summer, when microplankton clearly dominated, accounting for 64 ± 13% of the total microbial plankton biomass. Pico- and nanoplankton were present in the microbial community all year round, with mean biomass values of 0.32 ± 0.09 and 0.42 ± 0.23 g C m–2, respectively. These 2 fractions became more relevant during winter, when the contribution of microplankton to total microbial plankton biomass decreased (to 23 ± 9%), and a balanced trophic structure between autotrophs and heterotrophs was established. At RaS, a significantly lower biomass of microplankton (by 46 ± 32%) and nanoplankton (by 35 ± 22%) was observed compared to ReS, regardless of their trophic nature. Picoplankton biomass did not differ between sites. These results suggest that mussel farming exerts a top-down control over the microbial plankton community by consuming micro- and nanoplankton without affecting picoplankton. An excess of ammonium, probably excreted by mussels, and a lower autotrophic carbon:chlorophyll ratio at RaS suggest that mussel culture could also exert a bottom-up-like control on the phytoplankton that escape mussel consumption in farming zones | Descripción: | 12 páginas, 3 tablas, 5 figuras | Versión del editor: | http://dx.doi.org/10.3354/meps10612 | URI: | http://hdl.handle.net/10261/93376 | DOI: | 10.3354/meps10612 | ISSN: | 0171-8630 | E-ISSN: | 1616-1599 |
Aparece en las colecciones: | (IIM) Artículos |
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Frojan_microbial_plankton.pdf | 1,25 MB | Adobe PDF | Visualizar/Abrir |
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