Factors controlling the community structure of picoplankton in contrasting marine environments.
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AuthorsOtero-Ferrer, J.L. (José Luis); Cermeño, P.; Bode, A. (Antonio); Fernández-Castro, B. (Bieito); Gasol, J.M. (Josep María); Morán, X.A.G. (Xosé Ánxelu Gutiérrez); Marañón, E. (Emilio); Moreira-Coello, V. (Víctor); Varela, M.M. (Marta María); Villamaña, M.; Mouriño-Carballido, B. (Beatriz)
The effect of inorganic nutrients on planktonic assemblages has traditionally relied on concentrations rather than estimates of nutrient supply. We combined a novel dataset of hydrographic properties, turbulent mixing, nutrient concentration, and picoplankton community composition with the aims of (i) quantifying the role of temperature, light, and nitrate fluxes as factors controlling the distribution of autotrophic and heterotrophic picoplankton subgroups, as determined by flow cytometry, and (ii) describing the ecological niches of the various components of the picoplankton community. Data were collected at 97 stations in the Atlantic Ocean, including tropical and subtropical open-ocean waters, the northwestern Mediterranean Sea, and the Galician coastal upwelling system of the northwest Iberian Peninsula. A generalized additive model (GAM) approach was used to predict depth-integrated biomass of each picoplankton subgroup based on three niche predictors: sea surface temperature, ...
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