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Change in the nutritional quality of phytoplankton is a key mechanism through which ocean acidification can affect the function of marine ecosystems. Copepods play an important role transferring energy from phytoplankton to higher trophic levels, including fatty acids (FA)—essential macronutrients synthesized by primary producers that can limit zooplankton and fisheries production. We investigated the direct effects of  p CO 2  on phytoplankton and copepods in the laboratory, as well as the trophic transfer of effects of  p CO 2  on food quality. The marine cryptophyte  Rhodomonas salina  was cultured at 400, 800, and 1200 μatm  p CO 2  and fed to adult  Acartia hudsonica  acclimated to the same  p CO 2  levels. We examined changes in phytoplankton growth rate, cell size, carbon content, and FA content, and copepod FA content, grazing, respiration, egg production, hatching, and naupliar development. This single-factor experiment was repeated at 12°C and at 17°C. At 17°C, the FA content of  R .  salina  responded non-linearly to elevated  p CO 2  with the greatest FA content at intermediate levels, which was mirrored in  A .  hudsonica ; however, differences in ingestion rate indicate that copepods accumulated FA less efficiently at elevated  p CO 2 .  A .  hudsonica  nauplii developed faster at elevated  p CO 2  at 12°C in the absence of strong food quality effects, but not at 17°C when food quality varied among treatments. Our results demonstrate that changes to the nutritional quality of phytoplankton are not directly translated to their grazers, and that studies that include trophic links are key to unraveling how ocean acidification will drive changes in marine food webs.

Direct and indirect effects of elevated CO2 are revealed through shifts in phytoplankton, copepod development, and fatty acid accumulation