Abstract
Most ecosystem models consolidate members of food-webs, e.g. species, into a small number of functional components. Each of these is then described by a single state variable such as biomass. When a multivariate approach incorporating multiple substances within components is substituted for this univariate one, a ‘stoichiometric’ model is formed. Here we show that the Nitrogen:Phosphorus ratio within zooplankton herbivores varies substantially intraspecifically but not intraspecifically. By using stoichiometric theory and recent measurements of the N:P ratio within different zooplankton taxa, we calculate large differences in ratios of nutrients recycled by different zooplankton species. Finally, we demonstrate that N:P stoichiometry can successfully account for shifts in N- and P-limitation previously observed in whole-lake experiments. Species stoichiometry merges food-web dynamics with biogeochemical cycles to yield new insights.
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Abbreviations
- b :
-
N:P in zooplankton biomass
- f :
-
N:P in algal biomass
- L :
-
maximum accumulation eficiency
- N:P:
-
ratio of nitrogen to phosphorus (moles:moles)
- s :
-
N:P supply ratio from grazers
- TN:
-
Total nitrogen = seston N + dissolved N (µmoles/liter)
- TP:
-
Total phosphorus = seston P + dissolved P (µmoles/liter)
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Sterner, R.W., Elser, J.J. & Hessen, D.O. Stoichiometric relationships among producers, consumers and nutrient cycling in pelagic ecosystems. Biogeochemistry 17, 49–67 (1992). https://doi.org/10.1007/BF00002759
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DOI: https://doi.org/10.1007/BF00002759