TY - JOUR
T1 - Goldman revisited
T2 - Faster-growing phytoplankton has lower N: P and lower stoichiometric flexibility
AU - Hillebrand, Helmut
AU - Steinert, Georg
AU - Boersma, Maarten
AU - Malzahn, Arne
AU - Meunier, Cédric Léo
AU - Plum, Christoph
AU - Ptacnik, Robert
PY - 2013
Y1 - 2013
N2 - In their seminal paper, Goldman et al. suggested that phytoplankton close to maximum growth rate attains a restricted optimal N: P ratio close to the Redfield ratio of molar N: P = 16. Recently, the presence of such a global attractor for optimal phytoplankton stoichiometry has been questioned in models and empirical analyses. As the chemical composition of phytoplankton is of major importance for our understanding of global elemental cycles and biogeochemical transformations, we assembled 55 data sets of phytoplankton growth rate and biomass N: P ratios in a meta-analysis testing (1) whether phytoplankton N: P converges at high growth rates, (2) whether N: P ratios scale with growth rate, and (3) whether the optimal N: P ratios achieved at highest growth rates reflect organism traits or environmental conditions. Across systems and species, phytoplankton N: P decreased with increasing growth rate and at the same time showed decreasing variance, i.e., fast-growing phytoplankton is more P rich and has a more confined elemental composition. Optimal N: P increased with increasing N: P of available nutrients, i.e., with increasing P limitation. Other differences were rare, except cyanobacteria showed higher optimal N: P than diatoms. Understanding the role of phytoplankton in biogeochemical transformation requires modeling approaches that are stoichiometrically flexible to reflect the dynamics of growth and nutrient supply in primary producers.
AB - In their seminal paper, Goldman et al. suggested that phytoplankton close to maximum growth rate attains a restricted optimal N: P ratio close to the Redfield ratio of molar N: P = 16. Recently, the presence of such a global attractor for optimal phytoplankton stoichiometry has been questioned in models and empirical analyses. As the chemical composition of phytoplankton is of major importance for our understanding of global elemental cycles and biogeochemical transformations, we assembled 55 data sets of phytoplankton growth rate and biomass N: P ratios in a meta-analysis testing (1) whether phytoplankton N: P converges at high growth rates, (2) whether N: P ratios scale with growth rate, and (3) whether the optimal N: P ratios achieved at highest growth rates reflect organism traits or environmental conditions. Across systems and species, phytoplankton N: P decreased with increasing growth rate and at the same time showed decreasing variance, i.e., fast-growing phytoplankton is more P rich and has a more confined elemental composition. Optimal N: P increased with increasing N: P of available nutrients, i.e., with increasing P limitation. Other differences were rare, except cyanobacteria showed higher optimal N: P than diatoms. Understanding the role of phytoplankton in biogeochemical transformation requires modeling approaches that are stoichiometrically flexible to reflect the dynamics of growth and nutrient supply in primary producers.
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U2 - 10.4319/lo.2013.58.6.2076
DO - 10.4319/lo.2013.58.6.2076
M3 - Article
AN - SCOPUS:84886415544
SN - 0024-3590
VL - 58
SP - 2076
EP - 2088
JO - Limnology and Oceanography
JF - Limnology and Oceanography
IS - 6
ER -