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Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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Related Experiment Video

Updated: Jun 12, 2025

Author Spotlight: Understanding Microbe Adaptation Using Innovative Techniques for Exploring Thermophilic Evolution
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Metabolic Plasticity Shapes Microbial Communities across a Temperature Gradient.

Xin Sun, Ariel Favier, Jacquelyn Folmar

    The American Naturalist
    |September 26, 2024
    PubMed
    Summary

    Microbial communities change with temperature. Increasing temperatures boost fermentation by-products from bacteria, altering community composition and function through metabolic responses and cross-feeding interactions.

    Keywords:
    community assemblymetabolismmicrobial ecologyphysiologytemperaturethermal performance

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    Area of Science:

    • Ecology
    • Microbiology
    • Systems Biology

    Background:

    • Understanding how abiotic factors influence microbial community assembly is crucial for predicting ecosystem functions.
    • Microbial communities are central to ecosystem health, yet their responses to environmental changes like temperature shifts remain poorly understood.

    Purpose of the Study:

    • To investigate the impact of temperature gradients on microbial community composition and function.
    • To elucidate the role of metabolic responses and cross-feeding in microbial community self-assembly under varying temperatures.

    Main Methods:

    • Studied the self-assembly of microbial communities in synthetic environments across a temperature gradient.
    • Analyzed metabolic responses of different microbial functional groups, focusing on carbon source partitioning and trophic structures.

    Main Results:

    • Found that increasing temperatures enhance fermentation by-product production by respirofermentative bacteria.
    • Observed that these by-products influence the abundance of obligate respirators, demonstrating a temperature-dependent trophic cascade.
    • Metabolic plasticity and trade-offs significantly shape community dynamics across the temperature gradient.

    Conclusions:

    • Temperature-driven changes in microbial metabolism, particularly fermentation by-products, are key drivers of community composition shifts.
    • Metabolic plasticity and inter-species interactions (cross-feeding) are critical for predicting microbial community responses to environmental gradients.
    • This study underscores the importance of considering metabolic strategies in ecological models for microbial communities.