Ocean nutrient ratios governed by plankton biogeography
- 29 September 2010
- journal article
- Published by Springer Science and Business Media LLC in Nature
- Vol. 467 (7315), 550-554
- https://doi.org/10.1038/nature09403
Abstract
The major nutrients nitrate and phosphate have one of the strongest correlations in the sea, with a slope similar to the average nitrogen (N) to phosphorus (P) content of plankton biomass (N/P = 16:1). The processes through which this global relationship emerges despite the wide range of N/P ratios at the organism level are not known. Here we use an ocean circulation model and observed nutrient distributions to show that the N/P ratio of biological nutrient removal varies across latitude in Southern Ocean surface waters, from 12:1 in the polar ocean to 20:1 in the sub-Antarctic zone. These variations are governed by regional differences in the species composition of the plankton community. The covariation of dissolved nitrate and phosphate is maintained by ocean circulation, which mixes the shallow subsurface nutrients between distinct biogeographic provinces. Climate-driven shifts in these marine biomes may alter the mean N/P ratio and the associated carbon export by Southern Ocean ecosystems.This publication has 31 references indexed in Scilit:
- Irradiance and the elemental stoichiometry of marine phytoplanktonLimnology and Oceanography, 2006
- Optimal nitrogen-to-phosphorus stoichiometry of phytoplanktonNature, 2004
- The evolutionary inheritance of elemental stoichiometry in marine phytoplanktonNature, 2003
- Redfield revisited: variability of C:N:P in marine microalgae and its biochemical basisEuropean Journal of Phycology, 2002
- Rationalizing elemental ratios in unicellular algaeJournal of Phycology, 2000
- The relative influences of nitrogen and phosphorus on oceanic primary productionNature, 1999
- Global patterns of marine nitrogen fixation and denitrificationGlobal Biogeochemical Cycles, 1997
- Redfield ratios of remineralization determined by nutrient data analysisGlobal Biogeochemical Cycles, 1994
- Redfield ratio based on chemical data from isopycnal surfacesPublished by American Geophysical Union (AGU) ,1985
- Glacial to interglacial changes in ocean chemistryProgress in Oceanography, 1982