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Marine Ecology Progress Series

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MEPS 588:43-57 (2018)  -  DOI:

Amino acid utilization by eukaryotic picophytoplankton in a coastal upwelling system

Marta Hernández-Ruiz1,2,*, Antero Prieto1,2, Esther Barber-Lluch1,2, Eva Teira1,2

1Grupo de Oceanografía Biológica, Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo, 36310 Vigo, Spain
2Estación de Ciencias Marinas de Toralla (ECIMAT), Universidad de Vigo, 36331 Vigo, Spain
*Corresponding author:

ABSTRACT: The ability to combine autotrophic and heterotrophic nutritional modes by planktonic protists may significantly influence nutrient dynamics in the surface ocean. The extent and significance of organic resource utilization by small photosynthetic eukaryotes remain poorly explored. In order to evaluate the importance of autotrophy and heterotrophy within the most abundant pico-nanoeukaryotic phytoplankton groups in surface waters of a coastal upwelling area of NW of Spain, we combined catalyzed reported deposition-fluorescence in situ hybridization and microautoradiography with radiolabeled bicarbonate or amino acids. Over an annual cycle in 2015, picoplanktonic taxa represented more than 55% of the pico-nanoeukaryotic cells. The genus Ostreococcus dominated both in terms of abundance and activity during the nutrient-limiting spring to summer stratification period, when the utilization of amino acids was confirmed for dinoflagellates (22 to 33% of total dinoflagellate cells), Haptophyta (23 to 88% of total Haptophyta cells) and the picoeukaryotic genera Micromonas (9 to 38% of total Micromonas cells), Ostreococcus (10 to 38% of total Ostreococcus cells) and Bathycoccus (19 to 22% of total Bathycoccus cells). Our data suggest the adoption of different nutritional strategies among the smallest plastidic protists, which likely implies contrasting functional roles and competitive abilities within the picoeukaryotic phytoplankton.

KEY WORDS: Eukaryotic picophytoplankton · Autotrophy · Heterotrophy · CARD-FISH · Microautoradiography

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Cite this article as: Hernández-Ruiz M, Prieto A, Barber-Lluch E, Teira E (2018) Amino acid utilization by eukaryotic picophytoplankton in a coastal upwelling system. Mar Ecol Prog Ser 588:43-57.

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