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Optimal metabolic regulation along resource stoichiometry gradients

S. Manzoni, P. Čapek, M. Mooshammer, BD. Lindahl, A. Richter, H. Šantrůčková,

. 2017 ; 20 (9) : 1182-1191. [pub] 20170730

Jazyk angličtina Země Velká Británie

Typ dokumentu dopisy

Perzistentní odkaz   https://www.medvik.cz/link/bmc18016461

Most heterotrophic organisms feed on substrates that are poor in nutrients compared to their demand, leading to elemental imbalances that may constrain their growth and function. Flexible carbon (C)-use efficiency (CUE, C used for growth over C taken up) can represent a strategy to reduce elemental imbalances. Here, we argue that metabolic regulation has evolved to maximise the organism growth rate along gradients of nutrient availability and translated this assumption into an optimality model that links CUE to substrate and organism stoichiometry. The optimal CUE is predicted to decrease with increasing substrate C-to-nutrient ratio, and increase with nutrient amendment. These predictions are generally confirmed by empirical evidence from a new database of c. 2200 CUE estimates, lending support to the hypothesis that CUE is optimised across levels of organisation (microorganisms and animals), in aquatic and terrestrial systems, and when considering nitrogen or phosphorus as limiting nutrients.

Citace poskytuje Crossref.org

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$a Most heterotrophic organisms feed on substrates that are poor in nutrients compared to their demand, leading to elemental imbalances that may constrain their growth and function. Flexible carbon (C)-use efficiency (CUE, C used for growth over C taken up) can represent a strategy to reduce elemental imbalances. Here, we argue that metabolic regulation has evolved to maximise the organism growth rate along gradients of nutrient availability and translated this assumption into an optimality model that links CUE to substrate and organism stoichiometry. The optimal CUE is predicted to decrease with increasing substrate C-to-nutrient ratio, and increase with nutrient amendment. These predictions are generally confirmed by empirical evidence from a new database of c. 2200 CUE estimates, lending support to the hypothesis that CUE is optimised across levels of organisation (microorganisms and animals), in aquatic and terrestrial systems, and when considering nitrogen or phosphorus as limiting nutrients.
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$a Čapek, Petr $u Department of Ecosystem Biology, University of South Bohemia, České Budějovice, Czech Republic.
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$a Mooshammer, Maria $u Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria.
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$a Richter, Andreas $u Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria.
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$a Šantrůčková, Hana $u Department of Ecosystem Biology, University of South Bohemia, České Budějovice, Czech Republic.
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