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Biotic regulation of non-limiting nutrient pools and coupling of biogeochemical cycles

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  • Auguères, Anne-Sophie
  • Loreau, Michel

Abstract

Anthropogenic activities heavily affect biogeochemical cycles at global scales; thus it is critical to understand the degree to which these cycles can be regulated by organisms. Autotrophs can regulate nutrient abundance through resource consumption, but their growth should not be affected by changes in the supply of non-limiting nutrients. Here we present a model where autotrophs consume two nutrients – one limiting and one non-limiting nutrient – and access only part of the nutrients available in the environment. We apply our model to the oceanic cycles of iron and phosphorus to examine whether phytoplankton can regulate the concentrations of these key nutrients and how interactions between the two cycles affect their regulation efficiency. Our model predicts that autotrophs cannot efficiently regulate concentrations of the non-limiting nutrient. We show that changes in the supply of the limiting nutrient affect the concentrations of the non-limiting nutrient, and that the two nutrients vary in opposite directions. Our results suggest that interactions between biogeochemical cycles can result either in an increase or in a decrease in the regulation efficiency of nutrient concentrations, depending on whether the supplies of the limiting and non-limiting nutrients vary in the same or opposite directions due to anthropogenic activities.

Suggested Citation

  • Auguères, Anne-Sophie & Loreau, Michel, 2016. "Biotic regulation of non-limiting nutrient pools and coupling of biogeochemical cycles," Ecological Modelling, Elsevier, vol. 334(C), pages 1-7.
  • Handle: RePEc:eee:ecomod:v:334:y:2016:i:c:p:1-7
    DOI: 10.1016/j.ecolmodel.2016.04.016
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    References listed on IDEAS

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    3. Thomas Weber & Curtis Deutsch, 2012. "Oceanic nitrogen reservoir regulated by plankton diversity and ocean circulation," Nature, Nature, vol. 489(7416), pages 419-422, September.
    4. Thomas S. Weber & Curtis Deutsch, 2010. "Ocean nutrient ratios governed by plankton biogeography," Nature, Nature, vol. 467(7315), pages 550-554, September.
    5. Kevin R. Arrigo, 2005. "Marine microorganisms and global nutrient cycles," Nature, Nature, vol. 437(7057), pages 349-355, September.
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