Nutrient ratios in marine particulate organic matter are predicted by the population structure of well-adapted phytoplankton.

ABSTRACT: A common assumption of a constant nitrogen-to-phosphorus ratio (N:P) of 16:1 in marine particulate organic matter (POM) appears to be invalidated by observations of major spatial variations in N:P. Two main explanations have been proposed. The first attributes the N:P variability to changes in the community composition of well-adapted phytoplankton. The second proposes that variability arises from physiological acclimation involving intracellular adjustments of nutrient allocation under nutrient deficiency. Using a model of phytoplankton physiology, observational datasets, and a review of laboratory culture results, we assess the mechanistic basis of N:P variability. We find that the taxonomic composition of well-adapted phytoplankton best explains observed variations in POM N:P. Furthermo

SUBMITTER: Sharoni S 

PROVIDER: S-EPMC7439515 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature