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Increased temperature fluctuations amplify biodiversity loss impacts on ecosystem functioning. Species-rich communities better maintain functions under climate variability.

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Area of Science:

  • Ecology
  • Climate Change Biology
  • Ecosystem Science

Background:

  • Anthropogenic climate change and biodiversity loss are accelerating in the 21st century.
  • The interactive effects of climate variability and biodiversity loss on ecosystem functioning are poorly understood.
  • Increased climatic variability is a key feature of ongoing climate change.

Purpose of the Study:

  • To investigate the interactive effects of temperature fluctuations and phytoplankton species richness on ecosystem functioning.
  • To determine how climatic variability influences the importance of biodiversity for ecosystem functions.
  • To understand the mechanisms underlying the relationship between biodiversity, climate variability, and ecosystem functioning.

Main Methods:

  • Utilized microcosm communities with varying phytoplankton species richness.
  • Exposed communities to constant, mild, and severe temperature-fluctuating environments.
  • Developed a theoretical competition model to analyze experimental results.

Main Results:

  • Wider temperature fluctuations resulted in steeper biodiversity-ecosystem functioning slopes, indicating a stronger negative impact of species loss.
  • Severe temperature fluctuations led to a time-dependent increase in the biodiversity-ecosystem functioning slope due to decreased productivity in species-poor communities.
  • Species-rich communities maintained ecosystem functioning under increased fluctuation due to the presence of resistant species, unlike species-poor communities.

Conclusions:

  • Biodiversity is crucial for maintaining ecosystem functions and services under increased climatic variability.
  • Temperature fluctuations significantly alter the role of biodiversity in regulating ecosystem functioning.
  • Understanding these interactions is vital for predicting ecosystem responses to climate change.