The role of mixing in controlling resource availability and phytoplankton community composition
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AuthorsVillamaña, M.; Marañón, E.; Cermeño. P.; Estrada. M.; Fernández-Castro, B. (Bieito); Figueiras, F.G.; Latasa, M. (Mikel); Otero-Ferrer, J.L. (José Luis); Reguera, B. (Beatriz); Mouriño-Carballido, B. (Beatriz)
We investigate the role of mixing, through its effect on nutrient and light availability, as a driver of phytoplankton community composition in the context of Margalef’s mandala. Data on microstructure turbulence, irradiance, new nitrogen supply and phytoplankton composition were collected at 102 stations in three contrasting marine environments: the Galician coastal upwelling system of the northwest Iberian Peninsula, the northwestern Mediterranean, and the tropical and subtropical Atlantic, Pacific and Indian oceans. Photosynthetic pigments concentration and microscopic analysis allowed us to investigate the contribution of diatoms, dinoflagellates, pico- and nanoeukaryotes, and cyanobacteria to the phytoplankton community. Simple linear regression was used to assess the role of environmental factors on community composition, and environmental overlap among different phytoplankton groups was computed using nonparametric kernel density functions. Mixing and new nitrogen supply played ...