Abstract

All life on Earth seems to be made of the same chemical elements in relatively conserved proportions (stoichiometry). Whether this stoichiometry is conserved in settings that differ radically in physicochemical conditions (extreme environments) from those commonly encountered elsewhere on the planet provides insight into possible stoichiometries for putative life beyond Earth. Here, we report measurements of elemental stoichiometry for extremophile microbes from hot springs of Yellowstone National Park (YNP). Phototrophic and chemotrophic microbes were collected in locations spanning large ranges of temperature (24 °C to boiling), pH (1.6-9.6), redox (0.1-7.2 mg L<sup>-1</sup> dissolved oxygen), and nutrient concentrations (0.01-0.25 mg L<sup>-1</sup> NO2- , 0.7-12.9 mg L<sup>-1</sup> NO3- , 0.01-42 mg L<sup>-1</sup> NH<inf>4</inf><sup>+</sup>, 0.003-1.1 mg L<sup>-1</sup> P mostly as phosphate). Despite these extreme conditions, the microbial cells sampled had a major and trace element stoichiometry within the ranges commonly encountered for microbes living in the more moderate environments of lakes and surface oceans. The cells did have somewhat high C:P and N:P ratios that are consistent with phosphorus (P) limitation. Furthermore, chemotrophs and phototrophs had similar compositions with the exception of Mo content, which was enriched in cells derived from chemotrophic sites. Thus, despite the extraordinary physicochemical and biological diversity of YNP environments, life in these settings, in a stoichiometric sense, remains much the same as we know it elsewhere.

Original languageEnglish (US)
JournalGeobiology
DOIs
StateAccepted/In press - 2015

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stoichiometry
microorganism
microorganisms
national parks
national park
extremophile
chemical elements
hot springs
chemical element
autotrophs
cells
thermal spring
boiling
dissolved oxygen
trace elements
sea surface
nutrient content
planet
oceans
phosphate

ASJC Scopus subject areas

  • Environmental Science(all)
  • Ecology, Evolution, Behavior and Systematics
  • Earth and Planetary Sciences(all)

Cite this

Ordinary stoichiometry of extraordinary microorganisms. / Neveu, M.; Poret-Peterson, A. T.; Anbar, Ariel; Elser, James.

In: Geobiology, 2015.

Research output: Contribution to journalArticle

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