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Area of Science:

  • Ecology
  • Biodiversity science
  • Conservation biology

Background:

  • Human activities are altering global tree diversity through extinctions and the spread of non-native species.
  • These changes have significant implications for ecosystem structure, function, and stability.
  • Understanding the traits and environmental niches of different tree species is crucial for predicting future ecological shifts.

Purpose of the Study:

  • To analyze the functional traits and environmental niches of 31,001 tree species globally.
  • To compare naturalized, threatened, and non-threatened species to identify patterns in diversity.
  • To project future changes in tree communities under intensified extinction and naturalization scenarios.

Main Methods:

  • Analysis of functional traits and environmental niches for over 31,000 tree species worldwide.
  • Comparative analysis of naturalized, threatened, and non-threatened species.
  • Modeling future shifts in tree communities based on projected extinction and naturalization rates.

Main Results:

  • Future tree-rich ecosystems are predicted to be dominated by fast-growing, resource-acquisitive species.
  • Slow-growing, conservative species face higher extinction risks.
  • Naturalized species exhibit broader functional and environmental niches, thriving in colder, variable climates, while threatened species are specialized to warm, stable, nutrient-rich environments.

Conclusions:

  • Projected naturalizations may increase local functional diversity but could decrease long-term ecosystem stability due to acquisitive strategies.
  • Extinctions are expected to contract functional and environmental trait spaces, particularly in variable climates.
  • There is an accelerating global trend towards faster-growing tree communities, necessitating conservation of slow-growing species and management of acquisitive ones to mitigate impacts on carbon storage and biodiversity.