Nitrate and ammonium fluxes to diatoms and dinoflagellates at a single cell level in mixed field communities in the sea.

ABSTRACT: Growth of large phytoplankton is considered to be diffusion limited at low nutrient concentrations, yet their constraints and contributions to carbon (C) and nitrogen fluxes in field plankton communities are poorly quantified under this condition. Using secondary ion mass spectrometry (SIMS), we quantified cell-specific assimilation rates of C, nitrate, and ammonium in summer communities of large phytoplankton when dissolved inorganic nitrogen concentrations are low in temperate coastal regions. Chain-forming diatoms composed 6% of total particulate organic carbon, but contributed 20% of C assimilation, 54% of nitrate assimilation and 32% of ammonium assimilation within the plankton community. In contrast, large dinoflagellates composed 11% of total POC, and contributed 14% of the C assimi

SUBMITTER: Olofsson M 

PROVIDER: S-EPMC6363804 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature