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Community temporal variability increases with fluctuating resource availability.

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Resource pulse magnitude, not timing, significantly impacts protist community stability. High-magnitude nutrient pulses increase temporal variation, reducing community stability by enhancing species synchrony.

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Area of Science:

  • Ecology
  • Environmental Science
  • Microbiology

Background:

  • Resource availability influences ecosystem temporal variability.
  • The specific effects of fluctuating resource availability on community dynamics remain unclear.

Purpose of the Study:

  • To investigate how manipulated resource pulses varying in intensity, duration, and timing affect the temporal variability of a protist community.
  • To understand the mechanisms by which fluctuating resources alter community stability.

Main Methods:

  • A microcosm experiment using a laboratory protist community.
  • Manipulation of resource pulses (nutrients) with varying intensity, duration, and timing.
  • Analysis of temporal variability in total protist abundance and species synchrony.

Main Results:

  • Increased temporal variation in total protist abundance correlated with higher magnitude resource pulses.
  • Infrequent, high-magnitude pulses led to greater community instability than frequent, low-magnitude pulses.
  • Fluctuating resources increased community temporal variability by enhancing species synchrony and reducing dominant species' stabilizing effects.

Conclusions:

  • Resource pulse magnitude is a critical factor influencing community temporal variability and stability.
  • Mechanisms like species synchrony mediate the impact of fluctuating resources on community dynamics.
  • Understanding these effects is crucial given increasing anthropogenic nutrient inputs in global ecosystems.