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

被引:46
作者
Sharoni, Shlomit [1 ]
Halevy, Itay [1 ]
机构
[1] Weizmann Inst Sci, Dept Earth & Planetary Sci, IL-76100 Rehovot, Israel
基金
欧洲研究理事会;
关键词
FLEXIBLE ELEMENTAL STOICHIOMETRY; TO-PHOSPHORUS STOICHIOMETRY; CHEMICAL-COMPOSITION; EVOLUTIONARY INHERITANCE; ECOLOGICAL STOICHIOMETRY; PHYSIOLOGICAL-RESPONSES; AXENIC CULTURES; GROWTH-KINETICS; ATLANTIC-OCEAN; IRON;
D O I
10.1126/sciadv.aaw9371
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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. Furthermore, we show that acclimation to nutrient deficiency may be safely neglected when considering the effects of ecology on POM N:P. These findings provide insight into the controls on global variability in POM composition and average phytoplankton physiological performance in the oceans.
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页数:9
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