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The Biokinetic Spectrum for Temperature.

Ross Corkrey1, Tom A McMeekin1, John P Bowman1

  • 1Tasmanian Institute of Agriculture / School of Land and Food, University of Tasmania, Hobart, Tasmania, Australia.

Plos One
|April 19, 2016
PubMed
Summary

Scientists mapped the biokinetic spectrum for temperature, revealing distinct growth rate patterns for life on Earth. This data-driven spectrum identifies a unique gap between mesophiles and thermophiles, crucial for thermal ecology and systems biology.

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Area of Science:

  • Ecology
  • Microbiology
  • Systems Biology

Background:

  • Understanding the thermal limits of life is crucial for ecological and biological modeling.
  • Existing models often rely on theoretical assumptions rather than empirical data for thermal responses.

Purpose of the Study:

  • To identify and describe the distribution of temperature-dependent specific growth rates for life on Earth, termed the biokinetic spectrum for temperature.
  • To provide a data-driven foundation for thermal ecology, systems biology, and physiological insights.
  • To investigate the biological significance of observed patterns in growth rates across temperatures.

Main Methods:

  • Utilized Bayesian quantile regression to analyze temperature-dependent growth rate data.
  • Developed a thermodynamic model to explain the observed spectral shape.
  • Compiled and analyzed a comprehensive dataset of growth rates across diverse organisms.

Main Results:

  • Identified a "biokinetic spectrum for temperature" with a Δ-shape, peaking around 42°C.
  • Discovered a significant "Mesophile-Thermophile Gap" (MTG) between 42°C and 67°C, indicating a biological transition.
  • Observed a secondary peak at 67°C, followed by a decline in maximum growth rates, with no organisms found growing above the spectrum's maximum.
  • The Δ-shape is consistent with a thermodynamic model balancing protein activity and stability.

Conclusions:

  • The biokinetic spectrum provides a robust, data-driven framework for understanding thermal responses in biological systems.
  • The Mesophile-Thermophile Gap represents a fundamental biological transition, impacting microbial ecology and evolution.
  • The findings offer critical constraints for systems biology models and enhance predictions in thermal ecology.