Ecoenzymatic stoichiometry at the extremes

How microbes cope in an ultra-oligotrophic desert soil

Yunuen Tapia-Torres, James Elser, Valeria Souza, Felipe García-Oliva

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Arid ecosystems are characterized by stressful conditions of low energy and nutrient availability for soil microorganisms. It has been observed that the ecoenzymes needed for the transformation of organic compounds into assimilable products show similar scaling relationships in different habitats (logarithmic C:N:P scaling ratios ~1:1:1). In this study in Cuatro Ciénegas Basin (CCB) in the Chihuahuan desert of México, we report among the lowest ecoenzymatic activities yet quantified in soil. Nevertheless, activities for both organic N and organic P acquisition enzymes scale with C acquisition with a slope of ~1.0, indicating that the soil microbial communities of this ultra-oligotrophic desert ecosystem follow the global ecoenzymatic stoichiometry patterns. CCB soil microbial communities were co-limited by C and either by N or P but this co-limitation played out differently in different parts of the CCB as indicated by microbial ecoenzymatic shift to allocate more resources to acquire and immobilize the scarcer nutrient. By extending ecoenzymatic analyses to these ultra-oligotrophic soils, our findings support the broad utility of the approach in illuminating how microbes acquire limiting resources in arid ecosystems.

Original languageEnglish (US)
Pages (from-to)34-42
Number of pages9
JournalSoil Biology and Biochemistry
Volume87
DOIs
StatePublished - Aug 1 2015

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desert soils
desert soil
stoichiometry
Soil
Ecosystem
microorganisms
basins
microbial communities
ecosystems
ecosystem
microbial community
soil
desert
basin
Chihuahuan Desert
soil microorganism
resource
Food
soil microorganisms
nutrient availability

Keywords

  • Chihuahuan desert
  • Ecological stoichiometry
  • Enzyme
  • Microbial community homeostasis
  • México
  • Threshold elemental ratio

ASJC Scopus subject areas

  • Soil Science
  • Microbiology

Cite this

Ecoenzymatic stoichiometry at the extremes : How microbes cope in an ultra-oligotrophic desert soil. / Tapia-Torres, Yunuen; Elser, James; Souza, Valeria; García-Oliva, Felipe.

In: Soil Biology and Biochemistry, Vol. 87, 01.08.2015, p. 34-42.

Research output: Contribution to journalArticle

Tapia-Torres, Yunuen ; Elser, James ; Souza, Valeria ; García-Oliva, Felipe. / Ecoenzymatic stoichiometry at the extremes : How microbes cope in an ultra-oligotrophic desert soil. In: Soil Biology and Biochemistry. 2015 ; Vol. 87. pp. 34-42.
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