Stoichiometric relationships among producers, consumers and nutrient cycling in pelagic ecosystems

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.

[1]  G. Belovsky.  How Important are Nutrient Constraints in Optimal Foraging Models or are Spatial/Temporal Factors More Important? , 1990 .

[2]  J. M. Scott.  Effect of growth rate of the food alga on the growth/ingestion efficiency of a marine herbivore , 1980, Journal of the Marine Biological Association of the United Kingdom.

[3]  J. E. Cohen,et al.  Food webs and niche space. , 1979, Monographs in population biology.

[4]  K. Børsheim,et al.  Dependence of the rate of release of phosphorus by zooplankton on the P: C ratio in the food supply, as calculated by a recycling model1 , 1986 .

[5]  A. C. Redfield.  The biological control of chemical factors in the environment. , 1960, Science progress.

[6]  Yasunori Watanabe,et al.  Possibility of N or P limitation for planktonic cladocerans: An experimental test , 1992 .

[7]  A. Jensen,et al.  Effects of Fish Removal on the Limnetic Ecosystem of a Eutrophic Lake , 1990 .

[8]  F. H. Rigler,et al.  A Test of a Simple Nutrient Budget Model Predicting the Phosphorus Concentration in Lake Water , 1974 .

[9]  A. J. Lotka.  Elements of Physical Biology. , 1925, Nature.

[10]  John R. Post,et al.  Trophic Relationships in Freshwater Pelagic Ecosystems , 1986 .

[11]  A. Davies,et al.  Plankton as a Factor in the Nitrogen and Phosphorus Cycles in the Sea , 1971 .

[12]  Tom Andersen,et al.  Carbon, nitrogen, and phosphorus content of freshwater zooplankton , 1991 .

[13]  R. Hecky,et al.  Nutrient limitation of phytoplankton in freshwater and marine environments: A review of recent evidence on the effects of enrichment1 , 1988 .

[14]  V. Korinek,et al.  Demonstration of the effect of the fish stock on the species composition of zooplankton and the intensity of metabolism of the whole plankton association: With 22 figures on 2 folders , 1961 .

[15]  J. Bloesch,et al.  Changes in phytoplankton and zooplankton biomass and composition reflected by sedimentation , 1989 .

[16]  S. McNaughton,et al.  Mineral nutrition and seasonal movements of African migratory ungulates , 1990, Nature.

[17]  W. J. Mattson,et al.  Herbivory in relation to plant nitrogen content , 1980 .

[18]  A. J. Lotka,et al.  Elements of Physical Biology. , 1925, Nature.

[19]  S. Carpenter,et al.  Zooplankton‐mediated transitions between N‐ and P‐limited algal growth1 , 1988 .

[20]  D. Tilman.  Resource competition and community structure. , 1983, Monographs in population biology.

[21]  H. Behrendt.  The chemical composition of phytoplankton and zooplankton in an eutrophic shallow lake , 1990 .

[22]  R. Goldstein,et al.  Analysis of Insect Consumption in a Forest Conopy , 1973 .

[23]  Donald L. DeAngelis,et al.  Nutrient dynamics and food-web stability , 1989 .

[24]  D. O. Hessen,et al.  Carbon, nitrogen and phosphorus status in Daphnia at varying food conditions , 1990 .

[25]  Å. Brabrand,et al.  Biomanipulation of a small, urban lake — removal of fish exclude bluegreen blooms , 1990 .

[26]  A. Mazumder,et al.  A comparison of lakes and lake enclosures with contrasting abundances of planktivorous fish , 1990 .

[27]  R. Howarth,et al.  Nitrogen fixation in freshwater, estuarine, and marine ecosystems. 2. Biogeochemical controls1 , 1988 .

[28]  J. C. Goldman,et al.  Oceanic Nutrient Cycles , 1984 .

[29]  R. Sterner,et al.  Phytoplankton nutrient limitation and food quality for Daphnia , 1993 .

[30]  M. Lynch,et al.  Predation, enrichment, and phytoplankton community structure1 , 1981 .

[31]  Stephen R. Carpenter,et al.  Cascading Trophic Interactions and Lake Productivity , 1985 .

[32]  H. Morowitz,et al.  Energy Flow in Biology , 1969 .

[33]  William A. Reiners,et al.  Complementary Models for Ecosystems , 1986, The American Naturalist.

[34]  David I. Wright.  Lake restoration by biomanipulation: Round Lake, Minnesota, the first two years , 1984 .

[35]  Lennart Persson,et al.  Predator Regulation and Primary Production Along the Productivity Gradient of Temperate Lake Ecosystems , 1988 .

[36]  T. Kiørboe.  Phytoplankton growth rate and nitrogen content: implications for feeding and fecundity in a herbivorous copepod , 1989 .

[37]  C. M. Yentsch,et al.  Variations in ammonium enhancement, an indication of nitrogen deficiency in New England coastal phytoplankton populations , 1977 .

[38]  E. Fee.  A relation between lake morphometry and primary productivity and its use in interpreting whole-lake eutrophication experiments , 1979 .

[39]  Dag O. Hessen,et al.  Inter- and intraspecific variations in zooplankton element composition , 1991, Archiv für Hydrobiologie.

[40]  P. Dillon,et al.  Retention and Resuspension of Phosphorus, Nitrogen, and Iron in a Central Ontario Lake , 1990 .

[41]  Thomas W. Schoener,et al.  Food Webs From the Small to the Large: The Robert H. MacArthur Award Lecture , 1989 .

[42]  R. Sterner.  The Ratio of Nitrogen to Phosphorus Resupplied by Herbivores: Zooplankton and the Algal Competitive Arena , 1990, The American Naturalist.

[43]  M. Vanni,et al.  Trophic cascades and phytoplankton community structure , 1990 .

[44]  R. Sterner.  The Role of Grazers in Phytoplankton Succession , 1989 .

[45]  S. Seitzinger.  Denitrification in freshwater and coastal marine ecosystems: Ecological and geochemical significance , 1988 .

[46]  S. McNaughton,et al.  Mineral nutrition and spatial concentrations of African ungulates , 1988, Nature.

[47]  D. Schindler.  A Hypothesis to Explain Differences and Similarities Among Lakes in the Experimental Lakes Area, Northwestern Ontario , 1971 .